If the continuity equation is applicable, what will happen to the air density (rho) if the cross sectional area of a tube changes? (low speed, subsonic and incompressible flow:A) rho1 = rho2B) rho1 > rho2C) The density depends on the change of the tube area.D) rho1 < rho2

Answers

Answer 1

If the continuity equation is applicable, which is the case for low speed, subsonic and incompressible flow, the density of air (rho) will change if the cross-sectional area of a tube changes. The continuity equation is based on the principle of conservation of mass, which states that the mass of a fluid cannot be created or destroyed but can only be conserved. In other words, the mass of air entering a tube must be equal to the mass of air leaving the tube.

If the cross-sectional area of a tube decreases, the air velocity will increase to maintain the same mass flow rate. According to the continuity equation, the product of the air density and the air velocity must remain constant.As the air velocity increases, the air density must decrease to compensate for the decrease in cross-sectional area and maintain the constant mass flow rate. Therefore, if the cross-sectional area of a tube decreases, the density of air (rho) will decrease as well.Conversely, if the cross-sectional area of a tube increases, the air velocity will decrease to maintain the same mass flow rate.The air density will increase to compensate for the increase in cross-sectional area and maintain the constant mass flow rate. Therefore, if the cross-sectional area of a tube increases, the density of air (rho) will increase as well.In summary, if the continuity equation is applicable, the density of air (rho) will change if the cross-sectional area of a tube changes. The direction of the change will depend on whether the cross-sectional area increases or decreases. If the area decreases, the density will decrease and if the area increases, the density will increase.

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Related Questions

A driver is traveling at 90 km/h down a 3% grade on good, wet pavement. An accident
investigation team noted that braking skid marks started 75m before a parked car was
hit at an estimated 45 km/h. Ignoring air resistance, calculate the theoretical friction
coefficient.

Answers

Answer:

0.35

Explanation:

We resolve the component of the weight of the car along and perpendicular to the grade. We have mgsinФ and mgcosФ where Ф = angle of grade.

Now, the frictional force f = μN = μmgcosФ where μ = coefficient of friction

So, the net force along the grade is F = mgsinФ - μmgcosФ.

The work done by this force moving a distance, d along the grade is

W = (mgsinФ - μmgcosФ)d

This work equals the change in kinetic energy of the car. So ΔK = 1/2m(v₂² - v₁²) = W = (mgsinФ - μmgcosФ)d

1/2m(v₂² - v₁²) = (mgsinФ - μmgcosФ)d

1/2(v₂² - v₁²) = (gsinФ - μgcosФ)d

(v₂² - v₁²)/2d = (gsinФ - μgcosФ)

dividing through by gcosФ, we have

(v₂² - v₁²)/2dgcosФ = (gsinФ/gcosФ) - μgcosФ/gcosФ

(v₂² - v₁²)/2dgcosФ = tanФ -  μ

μ = tanФ - (v₂² - v₁²)/2dgcosФ

given that tanФ = 3% = 3/100 and 1 + tan²Ф = 1/cos²Ф, cosФ = 1/(√1 + tan²Ф) = 1/(√1 + (3/100)²) = 1/(√1 + (9/10000)) = 1/(√10000 + 9/10000) = 1/√(10009/10000) = 100/√10009 = 100/100.05 = 0.9995.

Also, given that v₁ = 90 km/h = 90 × 1000/3600 m/s = 25 m/s and v₂ = 45 km/h = 45 × 1000/3600 m/s = 12.5 m/s, d = 75 m and g = 9.8 m/s².

So, substituting the values of the variables into the equation, we have

μ = tanФ - (v₂² - v₁²)/2dgcosФ

μ = 3/100 - ((12.5 m/s)² - (25 m/s)²)/(2 × 75 m × 9.8 m/s² × 0.9995)

μ = 3/100 - ((156.25 m/s)² - (625 m/s)²)/1,469.265 m²/s²

μ = 3/100 - (-468.75 m²/s²)/1,469.265 m²/s²

μ = 3/100 + 468.75 m²/s²/1,469.265 m²/s²

μ = 0.03 + 0.32

μ = 0.35

So, theoretical friction  coefficient is 0.35

Describe the meaning of the different symbols and abbreviations found on the documents that they use

Answers

Answer:

Engineering drawing abbreviations and symbols are used to communicate and detail the characteristics of an engineering drawing.

There are many abbreviations common to the vocabulary of people who work with engineering drawings in the manufacture and inspection of parts and assemblies.

Technical standards exist to provide glossaries of abbreviations, acronyms, and symbols that may be found on engineering drawings. Many corporations have such standards, which define some terms and symbols specific to them; on the national and international level, like BS8110 or Eurocode 2 as an example.

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Calculate the force of attraction between a cation with a valence of +1 and an anion with a valence of -1, the centers of which are separated by a distance of 1.9 nm.

Answers

The force of attraction between a cation with a valence of +1 and an anion with a valence of -1 can be calculated using Coulomb's law. the force of attraction between a cation with a valence of +1 and an anion with a valence of -1, separated by a distance of 1.9 nm, is approximately 4.74 x 10^8 N.

What is Coulomb's law?

Coulomb's law is a fundamental law in electromagnetism that describes the interaction between electrically charged particles. It states that the force of interaction between two point charges is directly proportional to the magnitude of the charges and inversely proportional to the square of the distance between them. Mathematically, the law can be expressed as:

F = k * (q1 * q2) / r^2

The force of attraction between a cation with a valence of +1 and an anion with a valence of -1 can be calculated using Coulomb's law. Coulomb's law states that the force of attraction between two charged particles is proportional to the product of their charges and inversely proportional to the square of the distance between them.

The equation for the force of attraction between two charged particles (q1 and q2) separated by a distance of r is given by:

F = k * (q1 * q2) / r^2

where k is the Coulomb's constant (8.987551787 x 10^9 N * m^2 / C^2).

For a cation with a valence of +1 and an anion with a valence of -1, the force of attraction can be calculated as follows:

q1 = +1, q2 = -1, r = 1.9 x 10^-9 m

F = k * (q1 * q2) / r^2

= 8.987551787 x 10^9 N * m^2 / C^2 * (1 * -1) / (1.9 x 10^-9 m)^2

= 4.74 x 10^8 N

So, the force of attraction between a cation with a valence of +1 and an anion with a valence of -1, separated by a distance of 1.9 nm, is approximately 4.74 x 10^8 N.

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(A) is a precursor to modern operating systems that allowed programs to be processed without human interaction. A) resident monitor B) batch processor C) Middleware D) Spooling

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The precursor to modern operating systems that allowed programs to be processed without human interaction is B) batch processor.

A batch processor is a system that processes a collection of jobs or programs in a sequential manner, without requiring constant human intervention. It allows multiple programs or jobs to be submitted for execution as a batch, and the system automatically executes them one after another without the need for manual intervention between jobs.

In a batch processing environment, programs are typically stored on punched cards, magnetic tapes, or other storage media. The batch processor reads the programs and data from the storage media, executes the programs, and produces the desired output. This process continues until all the jobs in the batch have been processed.

Batch processing was a significant advancement in the early days of computing when computers were primarily used for scientific and business applications. It allowed programs to be executed without the need for constant human attention, thereby improving efficiency and productivity.

Resident monitor (A) refers to a portion of the operating system that remains in memory at all times and provides basic system services. Middleware (C) refers to software that acts as an intermediary between different applications or systems, facilitating communication and data exchange. Spooling (D) stands for "Simultaneous Peripheral Operation On-Line" and refers to a technique used to improve input/output performance by storing data in a buffer before it is processed.

Among the given options, batch processor (B) is the best choice as the precursor to modern operating systems that enabled automated, non-interactive processing of programs.

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if the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is group of answer choices low oil supply. broken or weak pressure relief valve spring. air lock in the scavenge pump intake.

Answers

If the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is air lock in the scavenge pump intake.

Oil pressure gauge fluctuation is a common problem for the engine. It can occur due to various reasons such as faulty oil pressure gauge, oil pump failure, improper maintenance of the engine, oil leakage, and much more. But if the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is air lock in the scavenge pump intake.The scavenge pump in the engine is used to remove the oil from the engine's crankcase and delivers it back to the oil tank. If there is an air lock in the scavenge pump intake, then it will not pump the oil properly from the crankcase and deliver it back to the oil tank. It will cause the oil pressure to fluctuate over a wide range from zero to normal operating pressure.To fix this issue, you should first check the oil level in the engine and make sure that it is at the proper level. After that, you can check the scavenge pump intake for any air lock or blockage. If there is an air lock, then you need to remove it. If there is a blockage, then you need to remove the blockage to get the oil pump working again properly.

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A venturimeter of 400 mm × 200 mm is provided in a vertical pipeline carrying oil of specific gravity 0.82, flow being upward. The difference in elevation of the throat section and entrance section of the venturimeter is 300 mm. The differential U-tube mercury manometer shows a gauge deflection of 300 mm. Calculate: (i) The discharge of oil, and (ii) The pressure difference between the entrance section and the throat section.Take the coefficient of meter as 0.98 and specific gravity of mercury as 13.6

Answers

Answer:

the rate of flow = 29.28 ×10⁻³ m³/s or 0.029 m³/s

Explanation:

Given:

Diameter of the pipe = 100mm = 0.1m

Contraction ratio = 0.5

thus, diameter at the throat of venturimeter = 0.5×0.1m = 0.05m

The formula for discharge through a venturimeter is given as:

Where,

is the coefficient of discharge = 0.97 (given)

A₁ = Area of the pipe

A₁ =  

A₂ = Area at the throat

A₂ =  

g = acceleration due to gravity = 9.8m/s²

Now,

The gauge pressure at throat = Absolute pressure - The atmospheric pressure

⇒The gauge pressure at throat = 2 - 10.3 = -8.3 m (Atmosphric pressure = 10.3 m of water)

Thus, the pressure difference at the throat and the pipe = 3- (-8.3) = 11.3m

Substituting the values in the discharge formula we get

or

or

Q = 29.28 ×10⁻³ m³/s

Hence, the rate of flow = 29.28 ×10⁻³ m³/s or 0.029 m³/s

Hope This Helps :D

IF YOUR VEHICLE BREAKS DOWN, YOU SHOULD?

Answers

Answer:

1. TURN ON YOUR HAZARD/EMERGENCY LIGHTS

Turn on your hazard lights to warn other drivers as soon as you sense something's wrong. Keep them on until help arrives, recommends the National Motorists Association (NMA).

2. SLOW DOWN AND PULL OFF THE ROAD

Aim for the right shoulder of the road. Consumer reports recommends that you pull over to a safe, flat location that is as far away from moving traffic as possible.

3. TURN YOUR WHEELS AWAY FROM THE ROAD AND PUT ON THE EMERGENCY BRAKE

The California Department of Motor Vehicles (DMV) recommends pulling your emergency brake, sometimes called the parking brake. If you have to park on a hill or slope, turn the car's wheels away from the road to help prevent the care from rolling into traffic, says the California DMV.

4. STAY IN YOUR VEHICLE

If you're on a highway or crowded road, the Insurance Information Institute (III) recommends that you avoid getting out of your vehicle to look at the damage or fix a mechanical problem. If you need to get out of the car, get your vehicle to a safe place and make sure the road around you is completely clear. If you're stopped on the right-hand side of the road, get out through the passenger-side door.

5. BE VISIBLE

Once you're safely out of the vehicle, prop up your hood to let other drivers know they should proceed with caution. This will alert other drivers that you're broken down, according to the NMA.

6. SET UP FLARES OR TRIANGLES

Place flares or triangles with reflectors behind your car to alert other drivers to the location where you've stopped, says the III.

7. CALL FOR HELP

Call or use an app to get a tow truck, mechanic or roadside assistance to come help. your insurance company or other provider who may be able to help. If you're in an emergency situation or are not sure who to contact, call 911 or the local police for help.

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the following relations exists between material flexural strength and grain size: flexural strength, x (mpa) 70 63 67 64 68 62 70 66 68 67 69 71 grain size, y (nm) 71 66 68 65 69 66 68 65 71 67 68 70 If y and x are linearly related ( y = ax +b), determine the coefficient (a) of the relationship.
(Provide answer using 3 decimal places)

Answers

Bend strength and rupture modulus are other names for flexural strength.

The range of the flexural strength of flax and kenaf is observed to be between 167 and 169 MPa, which is almost the same. They are bast fibers, which are multicellular layers from 40% to 45% of plants that have been knocked together. Flexural strength reveals the amount of force needed to fracture a test sample with a certain measurement diameter. When this limit is reached, the test specimen cracks. The material can withstand more impacting forces the higher the value. Flexural testing gauges a material's stiffness or resistance to bending by measuring the amount of force needed to bend a plastic beam.

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The Rule That Packets Not Originating From Inside Your LAN Should Not Be Forwarded Relates To ___________. Question 31 Options: 1) Servers 2) Workstations 3)

Answers

The Rule That Packets Not Originating From Inside Your LAN Should Not Be Forwarded Relates to routers

What is meant by routers ?

In order to transfer data between two or more packet-switched computer networks, a router—either real or virtual—is used.. The Internet Protocol address (IP address) of the destination is examined by a router, which then determines the optimal path for the data packet to take to get there.

According to the various application categories, there are five different types of routers available. They include VPN routers, core routers, edge routers, wireless routers, and wired routers. The aforementioned fundamental details can be used to aid in making the best router selection possible.

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In a water jet macning, the mass flow rate of water is found to be 0.05 kg/s. consider water density as 996 kg/m and 0.02 cm is the diameter of the hole from which water jet comes out. neglect all the losses and potential head differences. determine the minimum pressure at which water suppling pump must operate.

In a water jet macning, the mass flow rate of water is found to be 0.05 kg/s. consider water density

Answers

The minimum pressure at which the water-supplying pump must operate is approximately 2.45 x 10⁶ Pa or 2450 bar.

Solution:

To calculate the minimum pressure at which the water-supplying pump must operate, we need to use the formula for the volumetric flow rate of a fluid:

Q = A * v

where,

Q =the flow rate

A = the cross-sectional area of the hole

v = the velocity of the fluid.

We can use this formula to determine the velocity of the water, and then use the Bernoulli equation to determine the minimum pressure.

From the question:

ṁ=0.05 kg/s

ρ= 996 kg/m

d= 0.02 cm

Calculating the area of the hole:

A = (π/4) * (d²)

where,

d is the diameter of the hole, and pi is approximately 3.14.

d = 0.02 cm = 0.0002 m

A = (3.14/4) * (0.0002 m)² = 1.57 x 10⁻⁷ m²

Using the mass flow rate to calculate the velocity of water:

Q = ṁ / ρ

where,

Q = the volumetric flow rate

ṁ = the mass flow rate

ρ = the density of water.

Q = (0.05 kg/s) / (996 kg/m³)

Q = 5 x 10⁻⁵ m³/s

Using the area of the hole to find the velocity of water

v = Q / A

v = (5 x 10⁻⁵ m³/s) / (1.57 x 10⁻⁷m²)

v = 318.8 m/s

Using the Bernoulli equation to find the pressure:

P = Patm + (1/2) * ρ * v²

where,

P = the pressure

Patm = the atmospheric pressure

ρ =the density of water

v = the velocity of the water.

P = Patm + (1/2) * (996 kg/m³) * (318.8 m/s)²

Hence, the minimum pressure at which the water-supplying pump must operate is approximately 2.45 x 10⁶ Pa or 2450 bar.

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Some full-time 4WD sedans use a front engine and transaxle, with a drive shaft connected to drive the rear wheels.
Select one:
True
O False

Answers

Answer:true

Explanation:

What unit of electricity is used as a signal for a computer?

Answers

Answer:

A power supply unit (PSU) converts mains AC to low-voltage regulated DC power for the internal components of a computer. Modern personal computers universally use switched-mode power supplies

Answer:

Volt is the SI (Standard International) unit of electrical potential of the..

Explanation:

One signal vin=0.2sin(wt) is applied to a bridge rectifier where Silicon diodes are used. The peak value of output voltage is expected to be
a)can't be estimated due to insufficient data
b)0.0
c)0.2
d)0.4

Answers

Answer:

This problem has been solved!

See the answer

7. The voltage that must be less than the breakdown voltage of the diode in order to prevent damage to the diode is the ________.

peak inverse voltage

maximum diode voltage

reverse surge voltage

maximum peak voltage

8. Assume the input signal to a rectifier circuit has a peak value of Vm = 12 V and is at a frequency of 60 Hz. Assume the output load resistance is R = 2kΩ and the ripple voltage is to be limited to Vr= 0.4 V. Determine the capacitance required to yield this specification for a (a) full-wave rectifier and (b) half-wave rectifier. Show all work.

9.A full-wave rectifier is to be designed to produce a peak output voltage of 12 V, deliver 120 mA to the load, and produce an output with a ripple of not more than 5 percent. An input line voltage of 120 V (rms), 60 Hz is available. Consider a bridge type rectifier. Specify the transformer ratio and the size of the required filter capacitor. Show all work.

Explanation:

When someone uses experience and/or information from others to determine the project duration and total cost, estimating is being used. A) top-down B) experiential C) bottom-up D) reference class E) professional estimation

Answers

Experiential estimating is being used to determine the project duration and total cost.

What is Experiential?
Experiential learning is an educational philosophy that focuses on learning through experience. It involves actively engaging in a hands-on, sensory-based activity that encourages and facilitates learning. This type of learning is often associated with the physical environment, where the learner interacts directly with the environment and the activity to gain knowledge. Experiential learning can also involve activities such as role-playing, simulations, and problem-solving. This approach to learning is based on the idea that learning is most effective when it is meaningful and relevant to the learner. It promotes active learning, reflection, and the development of critical thinking skills.

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A_____is any material that poses an unreasonable risk of damage or injury to persons, property, or
the environment if not properly controlled during handling.
Select one:
a. Hazardous material
b. Safety data sheet (SDS)
c. Both A and B
d. None of the above

Answers

Answer:

A, Hazardous Material

Explanation: Because that defines a hazardous material. A Safety Data Sheet isn't a material, so it can cause harm.

The gcf method returns the greatest common factor of parameters a and b, as determined by case I and case II. Write the gcf method below. You are encouraged to implement this method recursively.

Answers

The use GCF method is correctly illustrated recursively below

What is GCF (Greatest common factor)

The GCF is the greatest common factor that can be used to correctly divide two or more numbers without a reminder.

For example,

The parameters 20 and 30, to know the greatest common factor, write out each factors of 20 and 30

The factors of 20 = 1, 2, 4, 5, 10, and 20

The factors of 30 = 1, 2, 3, 5, 6, 10, 15, and 30

Therefore the GCF = 10

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you are going to begin your analysis on this truss by first trying to solve for the forces in members hd and cd. when applying the method of sections to divide the truss into two sections, what three members will the line that passes through the truss intersect if you are trying to solve for the forces in members hd and cd? (you must provide an answer before moving to the next part.)

Answers

The process comprises breaking the truss into individual pieces and analyzing each piece as a separate rigid body.

What is the goal of the truss's sectional analysis?The technique entails disassembling the truss into separate portions and examining each section as a distinct rigid body.The method of sections is typically the quickest and simplest way to identify the unidentified forces acting on a particular truss element.a list of the stepsAlways begin your calculations by looking at supports.Slice the members of the problem you want to solve.Consider the half-structure to be a separate static truss.Use the formula sum of forces = 0 to solve the truss.Consider for a minute a node with several unknown members.By selecting a joint with only three unknown member forces and one or more known load forces, space truss difficulties can be resolved.

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job enlargement is also referred to as a. optimal job loading. b. horizontal job loading. c. lateral job loading. d. parallel job loading. e. vertical job loading.

Answers

Job enlargement, also known as horizontal job loading, involves increasing the number of tasks that an employee is responsible for within their existing job role. This is in contrast to job enrichment, which involves increasing the level of responsibility or autonomy of an employee within their job role.

Some other terms that are related to job enlargement and job enrichment include:

Optimal job loading: This refers to the optimal balance of tasks and responsibilities within a job role, which can vary depending on the individual employee and the requirements of the job.

Lateral job loading: This refers to the addition of tasks that are similar in nature to the employee's existing responsibilities, but do not involve an increase in responsibility or autonomy.

Parallel job loading: This refers to the addition of tasks that are similar in nature to the employee's existing responsibilities, and may involve an increase in responsibility or autonomy.

Vertical job loading: This refers to the addition of tasks that involve an increase in responsibility or autonomy within the employee's job role. This can also be referred to as job enrichment.

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Consider a sphere with diameter of 10 mm, rho=3000 kg/m3 , k=20 w/mo C, C=1 kJ/Kg- o C and α=6.66*10-6 m2 /s, which is initially at 400o C. Then it is quenched in an air stream of 20 o C. Convection heat transfer coefficient, between air and the surface of the sphere, is h=10 W/m2 - o C. • Calculate the time required for the center of the sphere to reach 335 o C? • Now the sphere is moved to a large bath of water at 20 o C. The heat transfer coefficient between water and the surface of sphere is assumed to be 6000 W/m2 - o C. Estimate the time required for the center of the sphere to reach 50o C?

Answers

To calculate the time required for the center of the sphere to reach 335 o C, we need to use the following formula:

()=∞+(0−∞)−ℎ/

where T(t) is the temperature at time t, T0 is the initial temperature, T∞ is the temperature of the surrounding fluid, h is the convective heat transfer coefficient, A is the surface area of the sphere, m is the mass of the sphere, c is the specific heat of the sphere material, and t is time.

Using the given values, we can calculate the time required for the center of the sphere to reach 335 o C:

A = πd^2/4 = 7.85x10^-5 m^2

m = ρV = (4/3)π(d/2)^3ρ = 1.178 kg

t = (1/α) ln[(T0 - T∞)/(T(t) - T∞)] = 79.26 seconds

To estimate the time required for the center of the sphere to reach 50 o C in the water bath, we use the same formula, but with a different value of h:

h = 6000 W/m^2-°C

T∞ = 20 °C

T0 = 335 °C

m = 1.178 kg

c = 1000 J/kg-°C (since C = 1 kJ/kg-°C)

T(t) = 50 °C

t = (1/α) ln[(T0 - T∞)/(T(t) - T∞)] = 242.18 seconds

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10.the utility control center calculates ace based upon tie-line flows; then the agc module sends control signals out to the generators

Answers

The utility control center calculates ACE based on tie-line flows, and the AGC module sends control signals to generators.

What is the utility control?

One of its main jobs is to figure out the Area Control Error (ACE) using the amounts of electricity flowing between different areas. The ACE shows the contrast between the planned and real power trade between various parts or control areas in the power grid.

The AGC module tells the generators to increase or decrease their power. The control signals are usually sent through a communication network. This helps the AGC adjust the power levels of generators based on the changing load conditions.

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Steam at 5 MPa and 400 C enters a nozzle steadily with a velocity of 80 m/s, and it leavesat 2 MPa and 300 C. The inlet area of the nozzle is 50 cm2, and heat is being lost at a rateof 120 kJ/s. Determine the following:
a) the mass flow rateof the steam.
b) the exit velocity of the steam.
c) the exitarea of the nozzle.

Answers

Answer:

a) the mass flow rate of the steam is  \(\mathbf{m_1 =6.92 \ kg/s}\)

b) the exit velocity of the steam  is \(\mathbf{V_2 = 562.7 \ m/s}\)

c) the exit area of the nozzle is  \(A_2\) = 0.0015435 m²

Explanation:

Given that:

A steam with 5 MPa and 400° C enters a nozzle steadily

So;

Inlet:

\(P_1 =\) 5 MPa

\(T_1\) = 400° C

Velocity V = 80 m/s

Exit:

\(P_2 =\) 2 MPa

\(T_2\) = 300° C

From the properties of steam tables  at \(P_1 =\) 5 MPa and \(T_1\) = 400° C we obtain the following properties for enthalpy h and the speed v

\(h_1 = 3196.7 \ kJ/kg \\ \\ v_1 = 0.057838 \ m^3/kg\)

From the properties of steam tables  at \(P_2 =\) 2 MPa and \(T_1\) = 300° C we obtain the following properties for enthalpy h and the speed v

\(h_2 = 3024.2 \ kJ/kg \\ \\ v_2= 0.12551 \ m^3/kg\)

Inlet Area of the nozzle = 50 cm²

Heat lost Q = 120 kJ/s

We are to determine the following:

a) the mass flow rate of the steam.

From the system in a steady flow state;

\(m_1=m_2=m_3\)

Thus

\(m_1 =\dfrac{V_1 \times A_1}{v_1}\)

\(m_1 =\dfrac{80 \ m/s \times 50 \times 10 ^{-4} \ m^2}{0.057838 \ m^3/kg}\)

\(m_1 =\dfrac{0.4 }{0.057838 }\)

\(\mathbf{m_1 =6.92 \ kg/s}\)

b) the exit velocity of the steam.

Using Energy Balance equation:

\(\Delta E _{system} = E_{in}-E_{out}\)

In a steady flow process;

\(\Delta E _{system} = 0\)

\(E_{in} = E_{out}\)

\(m(h_1 + \dfrac{V_1^2}{2})\) \(= Q_{out} + m (h_2 + \dfrac{V_2^2}{2})\)

\(- Q_{out} = m (h_2 - h_1 + \dfrac{V_2^2-V^2_1}{2})\)

\(- 120 kJ/s = 6.92 \ kg/s (3024.2 -3196.7 + \dfrac{V_2^2- 80 m/s^2}{2}) \times (\dfrac{1 \ kJ/kg}{1000 \ m^2/s^2})\)

\(- 120 kJ/s = 6.92 \ kg/s (-172.5 + \dfrac{V_2^2- 80 m/s^2}{2}) \times (\dfrac{1 \ kJ/kg}{1000 \ m^2/s^2})\)

\(- 120 kJ/s = (-1193.7 \ kg/s + 6.92\ kg/s ( \dfrac{V_2^2- 80 m/s^2}{2}) \times (\dfrac{1 \ kJ/kg}{1000 \ m^2/s^2})\)

\(V_2^2 = 316631.29 \ m/s\)

\(V_2 = \sqrt{316631.29 \ m/s\)

\(\mathbf{V_2 = 562.7 \ m/s}\)

c) the exit area of the nozzle.

The exit of the nozzle can be determined by using the expression:

\(m = \dfrac{V_2A_2}{v_2}\)

making \(A_2\) the subject of the formula ; we have:

\(A_2 = \dfrac{ m \times v_2}{V_2}\)

\(A_2 = \dfrac{ 6.92 \times 0.12551}{562.7}\)

\(A_2\) = 0.0015435 m²

according to the american concrete institute, if the concrete is heated, which is the recommended minimum curing time?

Answers

The heat provided should maintain a minimum, concrete temperature of 50° f degrees until the concrete attains strengths of 500 psi (Usually two days) and double R-5.1 blankets.

one of the unresolved problems of flood forecasting is the precise determination of how often a flood (having a given discharge) can be expected to occur. because only a small percentage of all the streams in the united states have been gaged for more than a few decades. it is difficult to determine, for exampie, the loq-year or soo-year flood. consider the data below, which is the instantaneous peak discharge ior rapid creek in rapid city, south dakota, in each of forty-three years of record:
Water Year Discharge (m3/s)
1951 4.05
1952 73.6
1953 4.30
1954 3.90
1955 9.23
1956 3.68
1957 12.3
1958 2.29
1959 2.32
1960 2.32
1961 2.82
1962 37.1
1963 5.41
1964 7.59
1965 17.4
1966 3.96
1967 12.4
1968 5.61
1969 3.94
1970 6.94
1971 10.9
1972 885.0
1973 4.9
1974 14.6
1975 2.61
1976 18.0
1977 5.49
1978 12.3
1979 4.75
1980 3.37
1981 3.74
1982 7.48
1983 8.01
1984 7.05
1985 3.79
1986 2.52
1987 2.80
1988 3.57
1989 3.14
1990 3.51
1991 5.69
1992 2.97
1993 9.29
a. Included in the data is the exceptionally large flood of 1972, which killed 238 people in the Rapid City area, Based simply on the number of years of record and the fact that 1972 flood occurred one time during this interval, how often would a flood of this magnitude be expected?
b. The simplistic approach described above can be improved by a mathematical treatment such as shown in Table 8.2 and Figure 8.20. Using the graph paper below, plot a recurrence curve for the Rapid Creek flood data. [ Hint: Suggest that an eyeball, best fit, straight line plotted through the points, except ignore the 1972 flood. Assume that, because of its magnitude, the 1972 flood does not nicely conform to the rest of the data, and as such. Can be ignored.] What is the 100 year flood discharge?
c. What is the recurrence interval of the 1972 flood, using the curve thus drawn?
d. Given the range of values from a and c above, what can be stated relative to the frequency of floods as large as the one which occurred in 1972?y-three years of record:
Water Year Discharge (m3/s)
1951 4.05
1952 73.6
1953 4.30
1954 3.90
1955 9.23
1956 3.68
1957 12.3
1958 2.29
1959 2.32
1960 2.32
1961 2.82
1962 37.1
1963 5.41
1964 7.59
1965 17.4
1966 3.96
1967 12.4
1968 5.61
1969 3.94
1970 6.94
1971 10.9
1972 885.0
1973 4.9
1974 14.6
1975 2.61
1976 18.0
1977 5.49
1978 12.3
1979 4.75
1980 3.37
1981 3.74
1982 7.48
1983 8.01
1984 7.05
1985 3.79
1986 2.52
1987 2.80
1988 3.57
1989 3.14
1990 3.51
1991 5.69
1992 2.97
1993 9.29
a. Included in the data is the exceptionally large flood of 1972, which killed 238 people in the Rapid City area, Based simply on the number of years of record and the fact that 1972 flood occurred one time during this interval, how often would a flood of this magnitude be expected?
b. The simplistic approach described above can be improved by a mathematical treatment such as shown in Table 8.2 and Figure 8.20. Using the graph paper below, plot a recurrence curve for the Rapid Creek flood data. [ Hint: Suggest that an eyeball, best fit, straight line plotted through the points, except ignore the 1972 flood. Assume that, because of its magnitude, the 1972 flood does not nicely conform to the rest of the data, and as such. Can be ignored.] What is the 100 year flood discharge?
c. What is the recurrence interval of the 1972 flood, using the curve thus drawn?
d. Given the range of values from a and c above, what can be stated relative to the frequency of floods as large as the one which occurred in 1972?

Answers

a. Based on the 43 years of record and the fact that the 1972 flood occurred once during this interval, it can be estimated that a flood of this magnitude would be expected to occur once every 43 years, on average.

b. Using the graph paper, plot a recurrence curve for the Rapid Creek flood data. Ignoring the 1972 flood, an eyeball, best fit, and a straight line should be plotted through the points. The 100-year flood discharge can be determined by looking at the point on the graph which is at the 100-year recurrence interval.

c. The recurrence interval of the 1972 flood, using the curve drawn, can be determined by looking at the point on the graph which is nearest to the 1972 flood discharge.

d. Given the range of values from a and c above, it can be stated that floods as large as the one which occurred in 1972 are rare events and occur infrequently.

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FAULT LOCATION METHODS(input-output)

Answers

Fault location techniques are used in power systems for accurate pinpointing of the fault position.

This paper presents a comparative study between two fault location methods in distribution network with Distributed Generation (DG). Both methods are based on computing the impedance using fundamental voltage and current signals. The first method uses one-end information and the second uses both ends

Write a function in Java that implements the following logic: Given three ints, a, b, and c, return true if b is greater than a, and c is greater than b. However, with the exception that if bok is true, does not need to be greater than a

Answers

This function takes in three ints, a, b, and c, and uses the Math.abs() method to calculate the absolute value of the difference between each pair of ints (a and b, a and c, b and c).

What is java function?

The function that takes in three ints, a, b, and c, and uses the Math.abs() method to calculate the absolute value of the difference between each pair of ints (a and b, a and c, b and c).

The function then compares the absolute value of each difference to 10 and returns true if one of them is greater or equal than 10. If none of the differences are greater than or equal to 10, the function returns false.

Therefore, This function takes in three ints, a, b, and c, and uses the Math.abs() method to calculate the absolute value of the difference between each pair of ints (a and b, a and c, b and c).

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It is proposed to absorb acetone from air using water as a solvent. Operation is at 10 atm and is isothermal at 20°C. The total flow rate of entering gas is 10 kmol /h. The entering gas is 1.2 mol% acetone. Pure water is used as the solvent. The water flow rate is 15 kmol/h. The desired outlet gas concentration should be 0.1 mol % acetone. For this system, Henry's law holds and Ye = 1.5 X where Ye is the mol fraction of acetone in the vapour in equilibrium with a mol fraction X in the liquid.
KGa = 0.4 kmol*m^-3*s^-1
1. Draw a schematic diagram to represent the process.
2. Determine the mole fraction of acetone in the outlet liquid.

Answers

Answer:

The meole fraction of acetone in the outlet liquid is \(x_1 = 0.0072\)

Explanation:

1.

The schematic diagram to represent this process is shown in the diagram attached below:

2.

the mole fraction of acetone in the outlet liquid is determined as follows:

solute from Basis Gas flow rate \(G_s = 10(1-0.012) =9.88 kmol/hr\)

Let the entering mole be :\(y_1 = 1.2\) % = 0.012

\(y_1 =(\dfrac{y_1}{1-y_1})\)

\(y_1 =(\dfrac{0.012}{1-0.012})\)

\(y_1 =0.012\)

Let the outlet gas concentration be \(y_2\) = 0.1% = 0.001

\(y_2 = 0.001\)

Thus; the mole fraction of acetone in the outlet liquid is:

\(G_s y_1 + L_s x_2 = y_2 L_y + L_s x_1\)

\(9.88(0.012-0.001)=15*x_1\)

\(9.88(0.011) = 15x_1\)

\(x_1 = \dfrac{0.10868}{15}\)

\(x_1 = 0.0072\)

The mole fraction of acetone in the outlet liquid is \(x_1 = 0.0072\)

It is proposed to absorb acetone from air using water as a solvent. Operation is at 10 atm and is isothermal

A periodic digital waveform has a pulse width 25 and a period of 150 . Determine the frequency and the duty cycle

Answers

The frequency  is 6.67 kHz and the duty cycle is:16.67%.

Frequency and duty cycle

Given:

Pulse width=25

Period=150

Frequency:

Frequency=1/(150×10^-6)

Frequency=1/0.00015

Frequency=6.666 kHz

Frequency=6.67 kHz (Approximately)

Duty cycle:

Duty cycle=(25×10^-6)/ (150×10^-6)×100%

Duty cycle=16.67%

Therefore the frequency  is 6.67 kHz and the duty cycle is:16.67%.

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When required to drill holes on a roof that has no power supply the best drill for the job would be__________.

Answers

When required to drill holes on a roof that has no power supply the best drill for the job would be a cordless drill.

What is power supply?

It should be noted that a power supply is an electrical device which supplies electric power to an electrical load.

In this case, the main purpose of a power supply is simply to be able to convert electric current from the source to the correct current, and frequency.

In this case, the power supply unit converts the main AC to a low-voltage regulated DC power. Therefore, When required to drill holes on a roof that has no power supply the best drill for the job would be a cordless drill.

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... is an actual sequence of interactions (i.e., an instance) describing one specific situation; a ... is a general sequence of interactions (i.e., a class) describing all possible ... associated with a situation. ... are used as examples and for clarifying details with the client. ... are used as complete descriptions to specify a user task or a set of related system features.

Answers

Answer:

ScenarioUse caseScenariosScenariosUse case

Explanation:

A scenario is an actual sequence of interactions (i.e., an instance) describing one specific situation; a use case is a general sequence of interactions (i.e., a class) describing all possible scenarios associated with a situation. Scenarios are used as examples and for clarifying details with the client. Use cases are used as complete descriptions to specify a user task or a set of related system features.

Write a function named reverse that accepts a dictionary from integers to strings as a parameter and returns a new dictionary of strings to integers that is the original's "reverse". The reverse of a dictionary is defined here to be a new dictionary that uses the values from the original as its keys and the keys from the original as its values. Since a dictionary's values need not be unique but its keys must be, it is acceptable to have any of the original keys as the value in the result. In other words, if the original dictionary has pairs (k1, v) and (k2, v), the new dictionary must contain either the pair (v, k1) or (v, k2).

Answers

A function named reverse that accepts a dictionary from integers to strings as a parameter and returns a new dictionary of strings to integers that is the original's "reverse" is given below:

The Function

# Function to create an empty stack. It

# initializes size of stack as 0

def createStack():

   stack = []

   return stack

 

# Function to determine the size of the stack

def size(stack):

   return len(stack)

 

# Stack is empty if the size is 0

def isEmpty(stack):

   if size(stack) == 0:

       return true

 

# Function to add an item to stack . It

# increases size by 1

def push(stack, item):

  stack.append(item)

 

# Function to remove an item from stack.

# It decreases size by 1

def pop(stack):

   if isEmpty(stack):

       return

   return stack.pop()

 

# A stack based function to reverse a string

def reverse(string):

   n = len(string)

 

   # Create a empty stack

   stack = createStack()

 

   # Push all characters of string to stack

   for i in range(0, n, 1):

       push(stack, string[i])

 

   # Making the string empty since all

   # characters are saved in stack

   string = ""

 

   # Pop all characters of string and put

   # them back to string

   for i in range(0, n, 1):

       string += pop(stack)

   return string

# Driver code

s = "Geeksforgeeks"

print("The original string is : ", end="")

print(s)

print("The reversed string(using stack) is : ", end="")

print(reverse(s))

The Output

The original string is : Geeksforgeeks

The reversed string(using stack) is : skeegrofskeeG

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