The specific values of the components (resistors, buzzer, etc.) may vary depending on the requirements and components. Also, make sure to choose a buzzer and transistor that can handle the voltage and current requirements of the circuit.
A simple and easy-to-understand circuit using basic electronic components to create a warning circuit with three outputs through a buzzer:
Components required:
Buzzer
NPN Transistor (e.g., 2N2222)
Resistors
Power supply (e.g., 5V DC)
Circuit diagram:
Vcc
|
R1
|
| | Buzzer
| |
| |
| | NPN Transistor
| |
|_|_ Sensor
|
GND
Explanation:
Connect the positive terminal of the power supply (Vcc) to one end of the resistor (R1).
Connect the other end of R1 to the positive terminal of the buzzer.
Connect the negative terminal of the buzzer to the collector (C) of the NPN transistor.
Connect the emitter (E) of the NPN transistor to the ground (GND) of the power supply.
Connect the sensor to the base (B) of the NPN transistor. The sensor can be any type that detects moisture or water level in the soil (e.g., a simple two-wire probe).
Make sure to connect the ground of the power supply to the ground of the sensor.
Working:
When the sensor detects that the plant needs water urgently, it should send a signal to the base of the NPN transistor, turning it ON.
When the transistor is ON, current flows from Vcc through the resistor R1, buzzer, and transistor, activating the buzzer and producing a beeping sound.
If the plant needs water but not urgently, the sensor should send a signal to the base of the transistor, turning it OFF.
When the transistor is OFF, no current flows through the buzzer, and it remains silent.
If the plant does not need water, the sensor should not send any signal, keeping the transistor OFF and the buzzer silent.
Note: The specific values of the components (resistors, buzzer, etc.) may vary depending on the requirements and available components. Also, make sure to choose a buzzer and transistor that can handle the voltage and current requirements of the circuit.
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5. Which one of the following surveying instruments would be used when extremely accurate measurements are required?
O A. Builder's level
O B. Theodolite
O C. Laser level
O D. Automatic level
A model airfoil is mounted in a wind tunnel using standard air as shown in the figure. The airfoil chord is 15 cm and the span (length into paper) is 60 cm. The airfoil is mounted on a cylindrica! support rod with a 2 cm diameter and 25 cm long. Instrumentation at the base of the rod measures a total upward force of Fup - 50 N and a total streamwise (i.c., lengthwise) force of Fstream=6N. Calculate the lift coefficient and the drag coefficient of the airfoil. (Helpful hint: some shapes use planform area; some shapes use frontal area. It is important to read the finc print.) Needed chart:Eig. 9.23.pdf Standard air Airfoil V-30 m/s Support rod (Cylinder) Force instruments
To calculate the lift coefficient (Cl) and drag coefficient (Cd) of the airfoil, we need to use the following formulas:
Cl = Fup / (0.5 * ρ * A * V^2)
Cd = Fstream / (0.5 * ρ * A * V^2)
where Fup is the total upward force, Fstream is the total streamwise force, ρ is the density of air, A is the reference area, and V is the velocity of the air.
Fup = 50 N
Fstream = 6 N
Chord length (c) = 15 cm
Span length (s) = 60 cm
Support rod diameter = 2 cm
Support rod length = 25 cm
Air velocity (V) = 30 m/s (from the chart)
Density of air (ρ) = Standard air density (from the chart)
First, let's calculate the reference area (A) for the airfoil. Since the problem doesn't specify whether the lift and drag forces are based on planform area or frontal area, we'll assume it is based on the planform area, which is the product of chord length (c) and span length (s):
A = c * s
A = 0.15 m * 0.6 m
A = 0.09 m^2
Next, we can substitute the given values into the formulas to calculate the lift and drag coefficients:
Cl = 50 N / (0.5 * ρ * 0.09 m^2 * (30 m/s)^2)
Cd = 6 N / (0.5 * ρ * 0.09 m^2 * (30 m/s)^2)
To find the density of air (ρ), we can refer to the chart for standard air density at the given conditions.
Finally, substitute the density of air and the calculated reference area into the formulas to find Cl and Cd.
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design the source follower for a drain current of 1ma and a gain of 0.8. find rs, vgs, and w/l for the transistor.
To design the source follower for a drain current of 1mA and a gain of 0.8, follow the steps given below:
Step 1: Choose a MOSFET transistor that will handle the power required in the circuit. We will use a 2N7002 MOSFET in this example.
Step 2: Determine the bias current required for the circuit. Since the drain current is given as 1mA, that will be our bias current.
Step 3: Calculate the value of the source resistor Rs using the equation Rs = Vgs / Ibias, where Vgs is the gate-source voltage and Ibias is the bias current. We are given a gain of 0.8, which means that Vgs = Vout / 0.8. Let's assume that Vout is 5V, so Vgs = 6.25V. Using Ibias = 1mA, we get Rs = 6.25V / 1mA = 6.25kΩ.
Step 4: Determine the value of Vgs using the equation Vgs = sqrt(Id * Rl / k * W / L), where Id is the drain current, Rl is the load resistance, k is the transconductance parameter, and W and L are the width and length of the transistor. Let's assume Rl = 1kΩ, k = 2.5mA/V², and Id = 1mA. We are given a gain of 0.8, so the output voltage will be 5V. Using these values, we get Vgs = sqrt(1mA * 1kΩ / 2.5mA/V² * W / L) = sqrt(400Ω * W / L).
Step 5: Determine the value of W/L using the equation W/L = Vgs² / (2 * Id * k). Using the values we have calculated, we get W/L = (6.25V)² / (2 * 1mA * 2.5mA/V²) = 7.56.
Step 6: Check that the MOSFET is operating in the saturation region by verifying that Vgs > Vt + Vds, where Vt is the threshold voltage and Vds is the drain-source voltage. Let's assume Vds = 1V. Using Vt = 1V, we get Vgs = 2V, which is greater than Vt + Vds = 2V, so the MOSFET is operating in the saturation region.
Therefore, the source follower can be designed with a 2N7002 MOSFET transistor, a source resistor of 6.25kΩ, a gate-source voltage of 6.25V, and a width-to-length ratio of 7.56.
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A speed reducer is rated at a maximum input speed of 2609 rpm and a maximum input power of 8 horsepower. The speed reduction ratio is 1:25, and the service factor is 1.15. What is the maximum input power?
Answer:
9.2 hp
Explanation:
Service factor is the ratio of the gearbox rated horsepower (or torque) to the application's required horsepower (or torque)
SF = Pₒ / Pᵢ
Pᵢ = Pₒ × SF
Pᵢ = 8 hp × 1.15
Pᵢ = 9.2 hp
A commercial jet is flying at a standard altitude of 35,000 ft with a velocity of 550 mph: (a) what is the Mach number? (b) should the flow be treated as incompressible, why or why not?
Answer:
Mach number = 0.68168
The flow should be treated as compressible.
Explanation:
Given that:
The altitude of a commercial jet = 35000
The properties of air at that given altitude are as follows:
Pressure = 24.577 kPa
Temperature T = 50.78176° C
Temperature T = ( 50.78176 + 273 )K = 328.78176 K
\(\varphi = 0.38428 \ kg/m^3\)
The velocity is also given as: 550 mph = 245.872 m/s
Therefore, the sonic velocity is firstly determined by using the formula:
\(a = \sqrt{ \vartheta \times R \times T\\)
\(a = \sqrt{1.4 \times 287 \times 323.78176\)
\(a = \sqrt{130095.5112\)
a = 360.68755 m/s
Then, we can calculate the Mach number by using the expression:
\({Mach \ number = \dfrac{V}{a}}\)
\(Mach \ number = \dfrac{245.872}{360.68755}\)
Mach number = 0.68168
b) Ideally, all flows are compressible because the Mach number is greater than 0.3, suppose the Mach number is lesser than 0.3, then it is incompressible.
One of the requirements for tennis balls to be used in official competition is that, when dropped onto a rigid surface from a height of 120 in., the height of the first bounce of the ball must be in the range 55 in. <= h <= 60 in. Determine the range of the coefficients of restitution of the tennis balls satisfying this requirement. Any ideas on this?
Answer:
At temperature is and relative humidity is 86% therefore, the humidity ratio is 0.0223 and the specific volume is 14.289
At temperature is and Relative humidity is 40% therefore, the humidity ratio is 0.0066 and the specific volume is 13.535.
To calculate the mass of air can be calculated as follows:
Now , we going to calculate the volume,
The time which is required to fill the cistern can be calculated as follows:
Now, putting the value in above formula we get,
Therefore, the hours required to fill the cistern is 4.65 hours.
Explanation:
2. Describe how these variables will be affected by the use of flaps.
a. Lift
b. Drag
c. Takeoff airspeed
d. Takeoff distance
e. Wing camber
The flap is used to lift the aircraft in the air as it provides them with balance.
What are flaps?The flaps' main function is to produce additional pull during decreased airspeed, therefore allowing the aircraft to fly at much low rpm with a reduced chance of crashing.
The flap is used to lift the aircraft in the air as it provides them with balance.
They are used for dragging the aircraft as it provides them with a certain amount of height with increases and lowers it.
The takeoff speed is slowed so relatedly to the flap as the change in the structure for the dynamic effect of the airspeed.
Flap reduces the takeoff distance as a smaller speed is being created, which reduces the feed with the coefficient of lift.
The class have a chamber it provides some hollow stairs through which they can store the good and services also it is sometimes used for oil storage.
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The multimeter used on PV equipment should be true rms types capable of measuring at least how many volts AC or DC?
The multimeter used on PV equipment should be true RMS types capable of measuring at least 600 volts AC or DC.
This is based on the voltage readings capacity of the multimeter. The multimeter for measuring AC and DC volts usually comes with between 120-, 240-, 480-, 600- volts AC and 125-, 250-, 600-volts DC.
A multimeter is a common electronic instrument often used by technicians and engineers. It is either in analog or digital form. It is used for measuring any of the voltage, current, and resistance.
Hence, in this case, it is concluded that the correct answer is 600 voltages.
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Required information A system contains two components, A and B, connected in series, as shown in the diagram. Assume A and B function independently. For the system to function, both components must function. functions is 0.9 ?
A system contains two components A and B that are connected in series. The two components are required to function together in order for the system to work. Let’s assume that A and B work independently from each other. The probability that component A will function is 0.8, while the probability that component B will function is 0.9. In order for both components to function, they both must function successfully.
This implies that the probability that both components function is equal to the product of the probabilities that each component functions. Here's how it works:P(A and B) = P(A) × P(B) = 0.8 × 0.9 = 0.72.Now that we know the probability that both components will work is 0.72, let's double-check. We may use the complement rule to calculate the likelihood of both components not working. Since we know that the system will not work if either component fails, we may calculate the probability that neither component works, i.e., P(A’ and B’). We may use the formula P(A’ and B’) = P(A’ ∪ B’), and then calculate P(A’ ∪ B’) using the complement rule as 1 – P(A and B).P(A' ∪ B') = 1 - P(A and B) = 1 - 0.72 = 0.28.Therefore, the probability that the system will not work is 0.28, and the probability that it will work is 1 – 0.28 = 0.72.
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engineering controls are devices such as self sheathing needles and sharps containers to block or eliminate the sharp risk.
The given statement "the engineering controls are devices, such as sharps containers and self-sheathing needles, to block or eliminate the sharp risk" is true because engineering control devices are used to avoid the occurrence of hazards.
Engineering controls are devices that protect workers by eliminating hazardous conditions or by placing a barrier between the hazard and the worker. Examples of engineering control devices are exhaust ventilation to capture and exit airborne emissions or machine guards to shield the workers.
It means the engineering controls devices reduce or prevent hazards from coming into contact with workers. So the devices such as sharps containers and self-sheathing needles to block or eliminate the sharp risk are examples of engineering control devices.
"
Complete question
engineering controls are devices such as self sheathing needles and sharps containers to block or eliminate the sharp risk.
True
False
"
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Explain why it is important to model the context of a system that is being developed. Give two examples of possible errors that could arise if software engineers do not understand the system context.
Answer:
Explanation:
System models are created and used in order for all of the individuals involved in the process to be able to see exactly how each module that is being created connects to the rest of the system. This allows every developer to understand each module's/part's function and develop it with the entire system in mind. This also makes it easier to implement newer features. If a model is not made then the developers may miss key features and when it is time to piece all of the components of the system together, the overall process can become a jumbled mess.
Is modern water treatment still modern? Comment on this issue by: (a) describing the main components of the typical municipal water treatment process from source water to tap, and (b) noting several strengths and weaknesses/limitations of modern water treatment.
Modern water treatment is still considered modern as water treatment processes are constantly evolving and improving to provide better quality water.
Municipal water treatment processes go through multiple stages to ensure safe drinking water. The treatment process typically involves the following components: Coagulation and flocculation: In this stage, chemicals such as alum are added to the water. This causes impurities to clump together and form larger particles, which are then removed through filtration.
Sedimentation: The water is allowed to sit undisturbed to allow the larger particles to settle at the bottom of the tank. Filtration: Water is passed through various filters that remove any remaining impurities, including bacteria, viruses, and chemicals. Disinfection: Chlorine or other disinfectants are added to the water to kill any remaining bacteria or viruses before it is sent to the distribution system.
The potential for disinfectant byproducts to form when disinfectants react with natural organic matter4. The potential for microplastics to enter water sources due to inadequate filtration. It is important to continue to improve and adapt modern water treatment processes to ensure the provision of clean, safe drinking water to communities around the world.
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Design a circuit that inputs a 2-bit number X, adds 2 to X if X is even, or adds 3 to X if X is odd, the result must be output to a 3-bit number Y
The result must be displayed on 3 LEDS to show the binary equivalent
of Y, and on a 7 Segment Display to show the decimal equivalent of Y
I hope you guys can help me out
To design the circuit, you can use a combination of logic gates and adders.
Here's a concise description:Use two AND gates to check if the least significant bit (LSB) and the second least significant bit (SLB) of X are both 0, indicating an even number.
Connect the output of the AND gates to a 2-input multiplexer (MUX) with inputs X and X+2.
Use an XOR gate to check if the LSB of X is 1, indicating an odd number.
Connect the output of the XOR gate to a 2-input multiplexer (MUX) with inputs X+1 and X+3.
Connect the outputs of both MUXes to a 3-bit register, which stores the result as Y.
Connect the 3-bit output of the register to three LEDs to display the binary equivalent of Y.
Connect the 3-bit output of the register to a 3-to-8 decoder, which outputs the decimal equivalent of Y to the 7-segment display.
This circuit will add 2 to X if it's even or add 3 if it's odd, displaying the binary equivalent on LEDs and the decimal equivalent on the 7-segment display.
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Explain what the ancient Romans did to solve the problem in the following scenario.
Situation: In ancient Italy, farmers were experiencing a drought. Rather than move to where the water was, Roman inventors decided to bring the water to the farmers.
Answer:
They moved fresh water around their vast empire with aqueducts and canals.
Explanation:
When engineers cut into the base of a slope to make way for a new road, this is an example of a(n) ______ process that increases the likelihood of slope failure.
Let X and Y be independent Bernoulli variables such that P(X = 1) = p, P(Y = 1) = q for some 0 ≤ p, q ≤ 1. Find P(X ⊕2 Y = 1)
Answer:
dddddddddddddddddddddddddddddddddddddd
Explanation:
A mass attached to the end of a spring is stretched a distance x0 from equilibrium and released.
a. At what distance from equilibrium will it have velocity equal to half its maximum velocity?
b. At what distance from equilibrium will it have acceleration equal to half its maximum acceleration? Answer in terms of x0
.
a. The mass will have a velocity equal to half its maximum velocity at a distance of 0.707x0 from equilibrium.
b. The mass will have an acceleration equal to half its maximum acceleration at a distance of 0.5x0 from equilibrium.
The motion of a mass attached to a spring is described by the equation:
x = A cos(ωt + φ)
where x is the displacement from equilibrium, A is the amplitude of the motion, ω is the angular frequency (ω = sqrt(k/m) where k is the spring constant and m is the mass), t is time, and φ is the phase angle.
The maximum velocity and acceleration occur at the equilibrium position (x=0) and are given by:
v_max = Aω
a_max = Aω^2
To find the distance from equilibrium where the velocity is half its maximum value, we can solve for the displacement x when v = v_max/2:
v = -Aω sin(ωt + φ) = v_max/2
sin(ωt + φ) = -1/2
ωt + φ = -π/6 or 7π/6
Substituting ω = sqrt(k/m) and t = T/4 (where T is the period of the motion) gives:
sqrt(k/m)T/4 + φ = -π/6 or 7π/6
Solving for A cos(φ) (which is the displacement from equilibrium) gives:
A cos(φ) = ±(sqrt(3)/2)A
Therefore, the distance from equilibrium where the velocity is half its maximum value is 0.707x0.
To find the distance from equilibrium where the acceleration is half its maximum value, we can solve for the displacement x when a = a_max/2:
a = -Aω^2 cos(ωt + φ) = a_max/2
cos(ωt + φ) = -1/2
ωt + φ = ±2π/3
Substituting ω = sqrt(k/m) and t = T/3 gives:
sqrt(k/m)T/3 + φ = ±2π/3
Solving for A cos(φ) gives:
A cos(φ) = ±0.5x0
Therefore, the distance from equilibrium where the acceleration is half its maximum value is 0.5x0.
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A periodic digital waveform has a pulse width 25 and a period of 150 . Determine the frequency and the duty cycle
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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Prove that the center of pressure of a completely sub-merged plane surface is always below the center of gravity of the sub-merged surface or at most coincide with the center of gravity when the plane surface is horizontal.
The location at which the joined forces of a pressure distribution on a wholly submerged plane surface counteracts is determined by its shape, orientation, and furthermore the pressure composition.
How to show this?To exemplify, when a plane surface displays an evenly distributed pressure around its center of gravity, then the center of pressure will be found beneath the center of gravity when the surface inclines.
Yet, if the same plane surface remains horizontal, the pressure arrangement will remain homogenous and thus the two centers merge. Generally speaking, the center of pressure stands below, or at most level with, the center of gravity when the plane surface is straight.
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1. The term lefty loosey, righty tighty is used to prevent what?
Answer:
Used to recall the direction a standard screw
When findings are replicated using __________________, our confidence in the generalizability of the findings increases.
A) lab studies
B) college students
C) volunteers
D) multiple methods
Answer:
Option D - multiple methods
Explanation:
When findings are replicated using multiple methods, our confidence in the generalizability of the findings increases.
In contouring, it is necessary to measure position and not velocity for feedback.
a. True
b. False
In contouring during 2-axis NC machining, the two axes are moved at the same speed to achieve the desired contour.
a. True
b. False
Job shop is another term for process layout.
a. True
b. False
Airplanes are normally produced using group technology or cellular layout.
a. True
b. False
In manufacturing, value-creating time is greater than takt time.
a. True
b. False
Answer:
(1). False, (2). True, (3). False, (4). False, (5). True.
Explanation:
The term ''contouring'' in this question does not have to do with makeup but it has to deal with the measurement of all surfaces in planes. It is a measurement in which the rough and the contours are being measured. So, let us check each questions again.
(1). In contouring, it is necessary to measure position and not velocity for feedback.
ANSWER : b =>False. IT IS NECESSARY TO MEASURE BOTH FOR FEEDBACK.
(2). In contouring during 2-axis NC machining, the two axes are moved at the same speed to achieve the desired contour.
ANSWER: a=> True.
(3). Job shop is another term for process layout.
ANSWER: b => False
JOB SHOP IS A FLEXIBLE PROCESS THAT IS BEING USED during manufacturing process and are meant for job Production. PROCESS LAYOUT is used in increasing Efficiency.
(4). Airplanes are normally produced using group technology or cellular layout.
ANSWER: b => False.
(5). In manufacturing, value-creating time is greater than takt time.
ANSWER: a => True.
Technician A says that a body-over-frame vehicle may have front upper rails.
Technician B says that a body-over-frame vehicle usually has the body welded to the frame.
Who is right?
A)
A only
B)
B only
C)
Both A and B
D) Neither A nor B
Control points are areas of the vehicle structure that are used to monitor the precision of the vehicle body's dimensions as they are being assembled. Thus, option B is correct.
What frame vehicle usually has the body welded?In a full frame car, the body is independent of the frame and fastened by bushings and bolts. The unibody is a structure made up of integrated panels that are welded, bonded, and riveted together.
Therefore, In a full frame car, the body is independent of the frame and fastened by bushings and bolts. The unibody is a structure made up of integrated panels that are welded, bonded, and riveted together.
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me that both a triaxial shear test and a direct shear test were performed on a sample of dry sand. When the triaxial test is performed, the specimen was observed to fail when the major and minor principal stresses were 100 lb/in2 and 20 lb/in2, respectively. When the direct shear test is performed, what shear strength can be expected if the normal stress is 3000 lb/ft2
Answer:
shear strength = 2682.31 Ib/ft^2
Explanation:
major principal stress = 100 Ib / in2
minor principal stress = 20 Ib/in2
Normal stress = 3000 Ib/ft2
Determine the shear strength when direct shear test is performed
To resolve this we will apply the coulomb failure criteria relationship between major and minor principal stress a
for direct shear test
use Mohr Coulomb criteria relation between normal stress and shear stress
Shear strength when normal strength is 3000 Ib/ft = 2682.31 Ib/ft^2
attached below is the detailed solution
One - tenth kilogram of air as an ideal gas with k= 1.4 executes a carnot refrigeration cycle as shown i fig. 5,16, the isothermal expansion occurs at - 23C with a heat transfer to the air of 3.4 kj. The isothermal compression occurs at 27C to a final volume of 0.01m. Using the results of prob. 5.80 adapted to the case, Determine (a) the pressure, in Kpa, at each of the four principal states (b) the work, in KJ for each of the four processes (c) the coefficient of performance
Answer:
Hello your question is incomplete attached below is the missing part
a) p1 = 454.83 kPa, p2 = 283.359 Kpa , p3 = 536.423 kpa , p4 = 860.959kPa
b) W12 = 3.4 kJ, W23 = -3.5875 KJ, W34 = -4.0735 KJ, W41 = 3.5875 KJ
c) 5
Explanation:
Given data:
mass of air ( m ) = 1/10 kg
adiabatic index ( k ) = 1.4
temperature for isothermal expansion = 250K
rate of heat transfer ( Q12 ) = 3.4 KJ
temperature for Isothermal compression ( T4 ) = 300k
final volume ( V4 ) = 0.01m ^3
a) Calculate the pressure, in Kpa, at each of the four principal states
from an ideal gas equation
P4V4 = mRT4 ( input values above )
hence P4 = 860.959kPa
attached below is the detailed solution
b) Calculate work done for each processes
attached below is the detailed solution
C) Calculate the coefficient of performance
attached below is detailed solution
Who is the highest paid Biomedical Engineer?
The highest-paid Biomedical Engineer is biomedical engineers in the United States.
Biomedicаl engineering is а discipline thаt аdvаnces knowledge in engineering, biology аnd medicine, аnd improves humаn heаlth through cross-disciplinаry аctivities thаt integrаte the engineering sciences with biomedicаl sciences аnd clinicаl prаctice.
Аccording to PаyScаle, biomedicаl engineers in the United Stаtes with less thаn five yeаrs of experience mаke аn аverаge of $62,000 per yeаr. However, U.S. bаsed biomedicаl engineers with five to 10 yeаrs of experience mаy mаke neаrly 31 percent more with аverаge eаrnings between $80,000 to $81,000 per yeаr.
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A specimen made from a brittle material with a cross-section area of 0.004 m2 was gradually loaded in tension until it yielded at a load of 380 kN and fractured slightly after the yield point. If the specimen’s material observed elastic deformation until fracture, determine the material’s toughness in terms of the energy absorbed, in kJ. Take E = 200
Note that the toughness of the material is 0.0226 kJ.
How is this so?
Toughness = (Area of triangle * Cross-sectional area) / 1,000
= (0.5 * 380 kN * 200 GPa * 0.004 m2) / 1,000
= 0.0226 kJ
Toughness is important in physics as it measures a material's ability to absorb energy and withstand deformation or fracture.
It helps determine the material's resistance to cracking and breaking under stress, making it crucial in applications where durability and reliability are required.
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Two identical bulbs are connected to a 12-volt battery in parallel. The voltage drop across the first bulb is 12 volts as measured with a voltmeter. What is the voltage drop across the other bulb?
Answer:
12 volts
Explanation:
The voltages across parallel-connected items are identical. (In fact, that's why you can measure the voltage by connecting the voltmeter in parallel with the circuit element.)
The voltage drop across each bulb is 12 volts.
Lately your computer is spontaneously shutting down after only a few minutes of use. What is the most likely cause? (Choose two)
1.) The CPU is not supported by the BIOS
2.) The power connector for the fan was not connected to the motherboard
3.) The heat sink and fan were not installed correctly
4.) Someone unplugged the computer without preforming a proper shutdown first.
5.) The CPU is bad.
A computer is an electronic device that processes and stores data, performs calculations, and executes instructions to carry out various tasks. The most likely causes for the computer spontaneously shutting down within a short period of time are:
2.) The power connector for the fan was not connected to the motherboard: If the fan is not receiving power, the CPU may overheat quickly, triggering a shutdown to protect the system.
3.) The heat sink and fan were not installed correctly: Improper installation of the heat sink and fan can result in inadequate cooling, causing the CPU to overheat and leading to shutdowns for thermal protection.
While other factors like a bad CPU (5) or an unsupported CPU by the BIOS (1) could potentially cause shutdowns, the power connector and heat sink installation issues are more commonly associated with sudden and frequent shutdowns. It is recommended to ensure the fan is connected and the heat sink is properly installed to resolve the overheating issue and prevent the spontaneous shutdowns.
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an unknown material has a combined stress state and strengths (in kpsi) of: σx = 10, σy = 5, τxy = 4.5, sut = 20, suc = 80, sy = 18. choose an appropriate failure theory based on the given, find the effective stress and factor of safety against static failure.
The three failure theories which are generally used to calculate stresses are- Maximum principal stress theory Maximum principal strain theory Maximum shear stress theory Out of the three failure theories, Maximum principal stress theory is appropriate because we have been given the values of the stresses directly.
Given stress states are:
σx = 10,
σy = 5,
τxy = 4.5,
sut = 20,
suc = 80,
sy = 18
The stress values and failure stresses can be used to calculate the factor of safety and effective stress.The effective stress is calculated by the following formula:σ1 and σ2 are the principal stresses. As we do not have these values, we have to use the following formulas to find out these principal stresses using the given stress values.
Max. principal stress=σ1
= (σx + σy)/2 + √((σx - σy) /2)² + τ²xy/2
= 7.5 + √((10-5)/2)² + 4.5²/2
= 7.5 + 4.301 = 11.8 kpsi
Min. principal stress=σ2
= (σx + σy)/2 - √((σx - σy) /2)² + τ²xy/2
= 7.5 - √((10-5)/2)² + 4.5²/2
= 7.5 - 2.301
= 5.2 kpsi
Now we can calculate the effective stress = (σ1 - σ2)/2
= (11.8-5.2)/2
= 3.3 kpsi
Factor of Safety can be calculated as:
Factor of safety (FoS) = failure stress/ Effective stress
We have three different failure stresses
-Syt = 18 kpsi - tensile yield stressSuc = 80 kpsi - Unconfined Compressive strengthSut = 20 kpsi - Ultimate tensile strength
The minimum value of the Factor of Safety (FoS) out of the three is taken because the structure should fail first under the most unfavorable condition (i.e. minimum FoS).
The values of FoS for all three failure theories are calculated and the minimum value is taken.Max principal stress theory:
FoS = minimum failure stress/ Effective stress
Minimum FoS = min (18/3.3, 80/3.3, 20/3.3)
Minimum FoS = 5.45 (Approx)
Hence the factor of safety against static failure is 5.45.
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