Which of the following can be considered a sustaining
technology?
Select one:
a.
A typewriter
b.
A photocopier
c.
A BlackBerry device
d.
MP3 file format
e.
An internal antenna for cell phones

Answer:

Ductile

Explanation:

So, from the question, we have the following information or parameters or data which is going to help us in solving this particular problem or question;

=> " impact testing a sample = -100oC shows that the fracture surface is very DULL AND FIBROUS"

TAKE NOTE: DULL AND FIBROUS.

IMPACT TESTING is used by engineers in the configuration of a sample or object.

In order to determine whether a specimen is ductile or brittle, it can be shown from its appearance for instance;

A DUCTILE SAMPLE will be DULL AND FIBROUS thus, our answer!

But a brittle sample will have a crystal shape.

Answer:

Hydrogen gas

Explanation:

When a battery such as lead acid battery is being charged or discharged, it produces hydrogen gas. This gas is produced by the electrolysis of water from the aqueous solution of sulfuric acid.  

Therefore, when batteries are being charged or discharged, they generate hydrogen gas that is not toxic but explosive in high concentrations in air.

The correct answer is "Hydrogen gas"

Leaching is used in industries to separate a metal from its ore using acid and preserving desirable products such as gold. Thus option C is the correct answer.

A material that quickly releases electrons to produce positive ions and has good electrical conductivity, luster, and flexibility is referred to as metal.

A chemical is extracted from a solid material that has made contact with a liquid during the leaching process. While certain chlorides are dissolved in sodium chloride solution, precious metals like gold are dissolved in cyanide solutions.

Therefore, option C separation of a metal from its ore using acid and preserving desirable products such as gold is the appropriate answer.

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Answer:

1) This is because too much fuel is needed to get a payload from the surface to orbital altitude an accelerated to orbital speed.

2) This is because space travel present extreme environment that affect machines operations and survival.

Explanation:

Hope it helps

sen yapsana mk halla halla yaw

If you have a 22-pallet load, and assuming each pallet is the same weight, the maximum weight each pallet can weigh would be around 2,000 pounds

To find out the maximum each pallet can weigh in a 22-pallet load, you need to know the total weight limit for the load. The answer will depend on what type of truck or transportation vehicle you are using to transport the pallets, as each has different weight limits.

To illustrate, for a standard 53-foot trailer, the maximum weight allowed is typically around 44,000 pounds.  

44,000 pounds / 22 pallets = 2000.

However, if you know the specific weight limit for the truck or transportation vehicle you are using, you can calculate the maximum weight for each pallet accordingly.

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If a 22 pallet load is to be carried, then the maximum each pallet can weigh in the load will depend on the capacity of the truck, the weight limit per axle, and the total weight of the load.

The weight limit varies for different types of trucks, and other factors like the size and weight of the cargo, the type of load, and the distance to be traveled affect the weight distribution. Therefore, the maximum weight limit that each pallet can carry in a 22 pallet load is 11,250 pounds assuming an even distribution, a maximum weight capacity of 80,000 pounds.A truck can carry a maximum of 22 pallets of different weight capacities, the truck's total weight limit will be reached before 22 pallets are loaded. However, if the load is light and does not occupy much space, more pallets can be loaded. Therefore, it is essential to understand the maximum weight limit that each pallet can carry to prevent exceeding the truck's weight limit, which can cause accidents and damage to the goods.

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The calculate value of Mass flow rate = 0.00414 kg/s while the rejected heat is 1.32 Kw

We have to use the properties of the enthalpies from the pressure table

At p4 = 100 kpa

hf = 17.28 kj / kg

hfg = 217.16 kj / kg

enthalpy at the state 1

= 17.28 + 2*217.16

= 60.712 kj / kg

T1 = - 26 degrees celsius

enthalpy of vapor = 234.44 kj / kg

a. The mass flow rate

Ql = 1.2 x 600

= 720 watts

convert to Kw

= 0.72 KW

We have to find the mass flow rate

This is given as the formula

Ql  / h1 - h4

we would have

0.72 / 2344 - 60.712

Mass flow rate = 0.00414 kg/s

b. We have to find the rejection of the heat through the use of the number 1 law of thermodynamics

Qh = Ql + W

= 0.72 + 0.6

= 1.32 Kw

Hence the mass flow rate is 0.00414 and the rejected heat rate is 1.32 kW

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Answer:

Power= Heat energy\ time

heat energy= mc∆T

specific heat of water = 4180

1.5*4180*(60-25)

=219450

time = 10× 60= 600 secs

power = 219450/600

Power= 365.75 Watt

=0.37 KW

Explanation:

the actual has to be bigger because the heater might be required to handle more ...also to accommodate extra energy.

South African SMMEs can benefit from emerging technologies and practices in three key ways: digital transformation, e-commerce adoption, and cloud computing.

Digital transformation is crucial for SMMEs to stay competitive in today's fast-paced business landscape. By embracing digital tools and technologies, SMMEs can streamline their operations, enhance their productivity, and reach a wider customer base. This can be achieved through the implementation of digital marketing strategies, the use of customer relationship management (CRM) systems, and the adoption of automation and data analytics solutions. Digital transformation enables SMMEs to improve their efficiency, make data-driven decisions, and deliver better customer experiences.

E-commerce adoption is another significant opportunity for South African SMMEs. With the growing popularity of online shopping, establishing an e-commerce presence can help SMMEs expand their market reach beyond their local communities. This can be done by setting up an online store or leveraging existing e-commerce platforms. E-commerce enables SMMEs to sell their products or services 24/7, reach customers across the country (or even globally), and provide convenient and secure online payment options. It also opens doors to new marketing strategies, such as social media advertising and influencer collaborations, which can further boost sales and brand awareness.

Cloud computing offers SMMEs cost-effective and scalable solutions for their IT infrastructure needs. By moving their data storage, software applications, and computing power to the cloud, SMMEs can reduce their hardware and maintenance costs, improve data security and backup capabilities, and increase their overall agility. Cloud computing also enables SMMEs to access their business data and applications from anywhere with an internet connection, facilitating remote work and collaboration. Additionally, cloud-based services often come with built-in data analytics and machine learning capabilities, allowing SMMEs to derive valuable insights and optimize their business processes.

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"Use a theory that accounts for material yielding" to avoid false answers that use the method of finite elements based on linear elastic material model assumptions.

Thus, "Use a theory that accounts for material yielding" to avoid false answers that use the method of finite elements based on linear elastic material model assumptions.

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Waves in the electric and magnetic fields are known as electromagnetic waves. You must first understand what a field is, which is just a technique of giving each square inch of space a numerical value. You may see that as a temperature field, for instance, when you look at the weather predictions and they mention the temperature in several locations. Every location on Earth has a unique temperature that can be quantified. Everywhere on Earth has its own wind velocity, which is another form of field. This field differs somewhat from the temperature field in that the wind velocity has both a direction and a magnitude, whereas the temperature just has a magnitude (how hot it is). A vector is a quantity that has both magnitude and direction, hence a field that contains vectors at every location is referred to as a vector field. Vector fields include the magnetic and electric fields. We may examine what would happen if we placed a charged particle at any given position in space. If the charged particle were to accelerate, we would state that the electric field there is the direction in which the particle is moving. In general, positively charged particles will move in the electric field's direction, whereas negatively charged particles will move in the opposite way. Because it is a vector field, the magnetic field exhibits comparable behavior. We discovered in the 19th century that the same interaction, electromagnetism, really produces both electric and magnetic fields. Like an electromagnet, a changing electric field will produce a magnetic field, and a changing magnetic field will induce an electric field (like in a generator). If your system is configured properly, you may have an electric field that fluctuates, which in turn produces a magnetic field, which in turn induces another electric field, which in turn generates another magnetic field, and so on indefinitely. At the speed of light, this oscillation between a strong magnetic field and strong electric field spreads out indefinitely. In reality, light is an electromagnetic wave—an oscillation in the electromagnetic fields. An electric or magnetic field may exist without a medium since they exist in a vacuum, which implies that waves in these fields don't require a medium like sound to flow through.

If you see cars parked on both sides of the road facing the same direction that means they have one direction of travel, and that it is seen as a one-way street.

The rule states that if Cars parked are known to be facing the same direction on both ends of the street, it clearly shows the direction of travel, as well as the fact that it is a one-way street.

Note that a lot of people do not always follows the rules about the right direction they can park on a public street. Cars that are parked in both opposing directions connote the fact that the street should be two-way.

Therefore, If you see cars parked on both sides of the road facing the same direction that means they have one direction of travel, and that it is seen as a one-way street.

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Answer:

Base current increases and collector current decreases

Explanation:

Base current increases and collector current decreases

The collector current does reduces because electrons that moves from emitter to base and the electrons that moves from collector to base are both cancelled out. Some of these electrons enter from the emitter to the collector because, in a way, the emitter has been heavily döped

An increase in base current also means that there is more bias to the transistor

Answer: I believe the answer is 963.75 if I am reading the question right.

Explanation:

ACH=60L/V

ACH=2.25

V=25,700

25,700*2.25=57,825

57,825/60=963.75

L=963.75

60(963.75)/25,700=2.25

The maximum amount of air leakage that would result in an ACH of no more than 2.25 would be approximately 956.25 cfm (cubic feet per minute).

Given that ACH of a house is a measure of its​ air-tightness and the formula for ACH is ACH = 60L/V. It means that ACH is inversely proportional to air-tightness or leakage. Therefore, the lower the air leakage the higher the ACH and vice versa.Mathematically, it is represented as:ACH ∝ 1/L or L ∝ 1/ACH

We can solve the question as follows:ACH = 2.25 (since the maximum ACH is 2.25)The volume of the house, V = 25,700 cubic feet.Substituting in the formula,2.25 = 60L/25,700Dividing both sides by 2.25 gives us,L = (2.25 * 25,700)/60L = 956.25 cubic feet per minute (cfm)

Therefore, the maximum amount of air leakage that would result in an ACH of no more than 2.25 is approximately 956.25 cfm (cubic feet per minute).

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The voltage supplied in the communication room to the light fixtures can be 120 volts or 277 volts respectively.

Options B and C are the correct answers.

Voltage is the electric force that makes the charges move which creates an electric current.

The light fixtures are the component of light that is being attached to the wall or a ceiling that holds any kind of lighting element. For instance, the holder of a bulb in which it is fixed is treated as a light fixture. The general voltage produces by a light fixture is 120 volts but preferable should be at 277 volts.

Therefore, all the volts except which is mentioned in options A and D cannot correspond to the voltage of light fixtures.

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The best practice that Raven should follow is to use DC2 or DC3 as the Domain Naming Master of the following is a best practice that Raven should follow. The correct option is A.

The management of the addition or deletion of domains from the forest is the responsibility of the Domain Naming Master. For redundancy and fault tolerance, it is advised to split the FSMO roles among several domain controllers.

Since DC1 already has a copy of the global catalog, it is advantageous to choose a different domain controller (DC2 or DC3) as the Domain Naming Master to disperse the workload and guarantee high availability. This ensures that the forest's operations may continue even if one domain controller goes offline and prevents the creation of a single point of failure.

Thus, the ideal selection is option A.

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The false statement about most machine learning models is that: B. they are flexible enough to handle all issues you might see in your dataset (lack of data, incorrect data, etc).

Machine learning (ML) is also referred to as deep learning or artificial intelligence (AI) and it can be defined as a subfield in computer science which is typically focused on the use of data-driven techniques (methods), computer algorithms, and technologies to develop a smart computer-controlled robot with an ability to automatically perform and manage tasks that are exclusively meant for humans or solved by using human intelligence.

Generally speaking, machine learning models are designed and developed to accept numerical data (numbers) or collections of numerical data (numbers) as an input.

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The unfavorable flight feature that a pilot can encounter with an aircraft whose CG is placed behind the aft CG limit is stalling at higher than normal airspeed.

As was already established, operating with an aft CG can significantly minimize drag. This occurs because, in a certain configuration, less tail down force is needed to maintain level flight.

Less tail-down force is needed as the center of gravity shifts rearward, which also reduces stalling speed. But shifting a CG too far back affects pitch stability. With an aft CG, less tail-down force also means fewer.

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Explanation:

I won't answer each of these, but will give you an explaination of how to solve for each.

You'll need to use Ohm's Law and Kirchhoff's Voltage Law.

Remember Ohm's Law as \(V = IR\).

Kirchoff's Voltage Law says that the sum of voltages for a given circuit "loop" must equal zero. In the circuit shown, this means that the voltage provided by the battery (E_T) equals the voltage drop across each of the three resisters in the loop.

\(E_T = E_1 + E_2 + E_3\)

A couple of other helpful notes:

These three resistors are in series which means that the current flowing through them is equal.

So it is easy to see that... \(V = IR \rightarrow E_1 = 4*2 = 8 V\)

Solve for the voltage across E_2 and E_3. The sum of the three voltages equals the voltage of the battery (E_T).

Answer:

See calculation below

Explanation:

Given:

W = 30 kN = 30x10³ N

d = 75 mm

p = 6 mm

D = 300 mm

μ = tan Φ = 0.2

1. Force required at the rim of handwheel

Let P₁ = Force required at the rim of handwheel

Inner diameter or core diameter of the screw = dc = do - p = 75 - 6 = 69 mm

Mean diameter of screw:    *d = \(\frac{do + dc}{2}\) = (75 + 69) / 2 = 72 mm

and

tan α = p / πd  =  6 / (π x 72)  =  0.0265

∴ Torque required to overcome friction at he threads is  T = P x d/2

T = W tan (α + Ф) d/2

T =  \(W(\frac{tan \alpha + tan \theta}{1 - tan \alpha + tan \theta } ) * \frac{d}{2}\)

T = 30x10³ * ((0.0265 + 0.2) / (1 - 0.0265 x 0.2)) x 72/2

T = 245,400 N-mm

We know that the torque required at the rim of handwheel (T)

245,400 = P1 x D/2 = P1 x (300/2) = 150 P1

P1 = 245,400 / 150

P1 = 1636 N

2. Maximum compressive stress in the screw

                         30x10³

Qc = W / Ac = -------------- = 8.02 N/mm²

                      π/4 * 69²

Qc = 8.02 MPa

Bearing pressure on the threads (we know that number of threads in contact with the nut)

n = height of nut / pitch of threads = 150 / 6 = 25 threads

thickness of threads, t = p/2 = 6/2 = 3 mm

bearing pressure on the threads = Pb = W / (π d t n)

Pb = 30 x 10³ / (π * 72 * 3 * 25)

Pb = 1.77 N/mm²

Max shear stress on the threads = τ = 16 T / (π dc³)

τ = (16 * 245,400) / ( π * 69³ )

τ = 3.8 M/mm²

*the mean dia of the screw (d) = d = do - p/2 = 75 - 6/2 = 72

∴max shear stress in the threads τmax = 1/2 * sqrt(8.02² + (4 * 3.8²))

τmax = 5.5 Mpa

3. efficiency of the straightener

To = W tan α x d/2 = 30x10³ * 0.0265 * 72/2 = 28,620 N-mm

∴Efficiency of the straightener is η =  To / T = 28,620 / 245,400

η = 0.116 or 11.6%

By assuming the coefficient of friction for the collar as 0.2. efficiency of straightner is 11.6%.

Wheels are circular frames or disks that are mounted on machines or vehicles and are designed to rotate around an axis.

Given:

W = 30 kN = 30x10³ N

d = 75 mm

p = 6 mm

D = 300 mm

μ = tan Φ = 0.2

1. Force required at the rim of handwheel :

Let P₁ = Force required at the rim of handwheel

Inner diameter or core diameter of the screw = dc = do - p = 75 - 6 = 69 mm

Mean diameter of screw:    *d =  = (75 + 69) / 2 = 72 mm and

tan α = p / πd  =  6 / (π x 72)  =  0.0265

Torque required to overcome friction at he threads is  T = P x d/2

T = W tan (α + Ф) d/2

T = 30x10³ * ((0.0265 + 0.2) / (1 - 0.0265 x 0.2)) x 72/2

T = 245,400 N-mm

We know that the torque required at the rim of handwheel (T)

245,400 = P1 x D/2 = P1 x (300/2) = 150 P1

P1 = 245,400 / 150

P1 = 1636 N

2. Maximum compressive stress in the screw :

30x10³

Qc = W / Ac = -------------- = 8.02 N/mm²

π/4 * 69²

Qc = 8.02 MPa

Bearing pressure on the threads (we know that number of threads in contact with the nut)

n = height of nut / pitch of threads = 150 / 6 = 25 threads

thickness of threads, t = p/2 = 6/2 = 3 mm

bearing pressure on the threads = Pb = W / (π d t n)

Pb = 30 x 10³ / (π * 72 * 3 * 25)

Pb = 1.77 N/mm²

Max shear stress on the threads = τ = 16 T / (π dc³)

τ = (16 * 245,400) / ( π * 69³ )

τ = 3.8 M/mm²

*the mean dia of the screw (d) = d = do - p/2 = 75 - 6/2 = 72

max shear stress in the threads τmax = 1/2 * sqrt(8.02² + (4 * 3.8²))

τmax = 5.5 Mpa

Therefore, efficiency of the straightener :

To = W tan α x d/2 = 30x10³ * 0.0265 * 72/2 = 28,620 N-mm

Efficiency of the straightener is η =  To / T = 28,620 / 245,400

η = 0.116 or 11.6%

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The answer is analyze

Answer: Technician A is wrong , Technician B is correct.

Explanation:

The Air fuel ratio is used in the combustion process of engines whether internal or external, and defined as the mass  ratio of air to  fuel present in a combustion process.  When the ratio of the mass of air and fuel is right, combustion is said to be efficient and balanced and this is refereed to as stoichiometrc mixture which is a standard that all engines are required to target.

when the air fuel Ratios is  lower than the target stoichiometric, it is considered as a Rich mixture  while higher ratios  than stoichiometric are considered Lean mixtures. Lean mixtures are more efficient than rich mixtures although the main aim is to be at the stoichiometic mixture point.

Air fuel equivalence ratio, lambda and the amount of oxygen in an exhaust are two indicators for lean or rich mixtures in an air fuel ratio for combustion in engines

Now, Air–fuel equivalence ratio, λ (lambda), is defined as the  ratio of actual AFR to stoichiometry for a particular mixture,

when Lambda λ = 1.0 , the mixture is at stoichiometry,

when  λ < 1.0, the mixtrure is rich.

when  λ > 1.0, the mixture is  lean

 Therefore Technician A is wrong

Also The amount of oxygen present in the exhaust determines if the air-fuel mixture supplied to the combustion chambers is at the target or best ratio. Too much oxygen indicates that the mixture is lean and too little  indicates the mixture is rich. Therefore Technician B is right.

(a) To determine the thermal efficiency of the power plant, we first need to calculate the heat input and the net work output.

The heat input can be calculated using the mass flow rate of steam and the enthalpy difference between the steam entering the turbine and the saturated liquid exiting the condenser:Q_in = m_dot * (h_in - h_cond)where:m_dot = mass flow rate of steamh_in = specific enthalpy of steam at the turbine inlet (from steam tables)h_cond = specific enthalpy of saturated liquid at the condenser exit (from steam tables)Using steam tables, we can find that h_in = 3466.2 kJ/kg and h_cond = 497.4 kJ/kg. Assuming a mass flow rate of 1 kg/s for simplicity, we have:Q_in = 1 * (3466.2 - 497.4) = 2968.8 kW

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On a scatterplot depicting the relationship between television viewing and reading scores in grade school children, the number of hours of television watched per week would be plotted on the horizontal axis.

A scatterplot is a graphical representation that allows us to visualize the relationship between two variables. In this case, the two variables being studied are the hours of television watched per week and the reading scores of grade school children. By placing the hours of television watched on the horizontal axis, we can observe any potential patterns or trends between television viewing habits and reading performance. This positioning allows us to examine if there is any correlation between increased television consumption and its impact on reading scores among the children in the study.

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T(n) equals O(n4) and (n4): The substitution method can be used to demonstrate that T(n) is O(n4) for the upper bound. Assume S(n) = cn4.

Using the recurrence tree method, we can demonstrate that T(n) is (n4) for the lower bound. Let k represent the tree's level count. The cost of the tree as a whole can then be determined by: Overall Cost is equal to 2k * n4 = n4 * (2k/n4) = n4 * (2/n) k. This formula is identical to (n4) because k is a function of n and 2/n is a constant. b. To demonstrate that T(n) is O for the upper bound, we can apply the substitution approach (n log n). If c is a constant, then let S(n) = cn log n. To demonstrate that T(n) is O (n log n), we may then insert S(n) into the recurrence.

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Answer:

Electrical Capacitance

Explanation:

To find - unit of measure in SI for F

Solution -

The answer is - Electrical Capacitance

Reason -

The farad (symbol: F) is the SI derived unit of electrical capacitance, the ability of a body to store an electrical charge.

Răspuns:

Capacitate electrică

Explicaţie:

Pentru a găsi - unitate de măsură în SI pentru F

Soluție -

Răspunsul este - Capacitate electrică

Motiv -

Farada (simbolul: F) este unitatea de capacitate electrică derivată din SI, capacitatea unui corp de a stoca o sarcină electrică.

Answer:

Use a non digital multimeter.

Explanation:

If a digital multimeter displays "000" when reading amperage, the technician should adjust the multimeter to a higher amperage range.

This is because "000" typically indicates that the current being measured is too low for the current range selected on the multimeter.

By switching to a higher amperage range, the technician can get a more accurate reading and ensure that the multimeter is properly measuring the current in the circuit under test.

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Answer:

The advantages of using a pure sine wave for your appliances and machinery are as follows: Reduces electrical noise in your machinery.

translates to no TV lines and no sound system hum.

Cooking in microwaves is quicker.

Explanation:

The smoothest signal is a sine wave, and sine waves are the basis of all functions.

Every other continuous periodic function is a basis function, which means that it can be described in terms of sines and cosines.

For instance, using the Fourier series, I can describe the fundamental Sinusoidal frequency and its multiples in terms of the triangle and square waves.

Create a linear programming model for the issue, specify the decision variables, and Make a linear programming model to solve this issue. TheOptimal function value = 21.12

An unknown in an optimal solution is a choice variable. It has a domains, which is a condensed representation of the entire set of the variable's potential values.

x=number of store brand canned peas

y=number of national brand canned peas

Maximize: P

P = 0.28x+0.19y

Constraints:

-2x+y>=0

x+y<=144*6/9 or 96

x>=0

y>=0

Identify the ideal vertex and list all the vertices in the viable zone.

A(32,64)

B(0,0)

C(0,96)

Vertex       Value of objective

(32,64)      21.12

(0,0)          0

(0,96)       18.24

Optimal vertex = (32,64)

Optimal function value = 21.12

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