an electric circuit includes a voltage source and two resistances (50 and 75) in parallel. determine the voltage source required to provide 1.6 A of current through the 75 ohm resistance

Answers

Answer 1

Answer:

The voltage source required to provide 1.6 A of current through the 75 ohm resistance is 120 V.

Explanation:

Given;

Resistance, R₁ = 50Ω

Resistance, R₂ = 75Ω

Total resistance, R = (R₁R₂)/(R₁ + R₂)

Total resistance, R = (50 x 75)/(125)

Total resistance, R = 30 Ω

According to ohms law, sum of current in a parallel circuit is given as

I = I₁ + I₂

[tex]I = \frac{V}{R_1} + \frac{V}{R_2}[/tex]

Voltage across each resistor is the same

[tex]1.6 = \frac{V}{R_2}[/tex]  

V = 1.6 x R₂

V = 1.6 x 75

V = 120 V

Therefore, the voltage source required to provide 1.6 A of current through the 75 ohm resistance is 120 V.

This voltage is also the same for 50 ohms resistance but the current will be 2.4 A.

Answer 2

Answer:

120 volts

Explanation:

Since the two resistances are connected in parallel across the voltage source, the effective resistance of the circuit can be obtained by using the formula.

[tex]\frac{1}{R_{eq}}=\frac{1}{R_{1}}+ \frac{1}{R_{2}}[/tex]

given that [tex]R_{1} and R_{2}[/tex]  are 50 and 75 ohms respectively, we have the equivalent resistance as:

[tex]\frac{1}{R_{eq}}=\frac{1}{50}+ \frac{1}{75}=\frac{1}{30}[/tex]

hence,

[tex]R_{eq}= 30\Omega[/tex]

From Ohm's law, voltage = current X resistance.

given that the current through the 75 ohm resistor is 1.6 A

[tex]V= I\times R[/tex]

[tex]V= 1.6 \times 75\Omega[/tex]

voltage = 120 Volts.

Because the resistors are connected in parallel, it means that they are connected to the same voltage source.

Hence, the voltage source for the 75 Ohm resistance = 120 volts. This is same for the 50 Ohm resistor.


Related Questions

During the recovery of a cold-worked material, which of the following statement(s) is (are) true?
O Some of the internal strain energy is relieved.
O All of the internal strain energy is relieved.
O There is some reduction in the number of dislocations.
O There is a significant reduction in the number of dislocations, to approximately the number found in the precold-worked state.
O The electrical conductivity is recovered to its precold-worked state.
O The thermal conductivity is recovered to its precold-worked state.
O The metal becomes more ductile, as in its precold-worked state.
O Grains with high strains are replaced with new, unstrained grains.

Answers

Answer:

Some of the internal strain energy is relieved.

There is some reduction in the number of dislocations.

The electrical conductivity is recovered to its precold-worked state.

The thermal conductivity is recovered to its precold-worked state

Explanation:

The process of the recovery of a cold-worked material happens at a very low temperature, this process involves the movement and annihilation of points where there are defects, also there is the annihilation and change in position of dislocation points which leads to forming of the subgrains and the subgrains boundaries such as tilt, twist low angle boundaries.

A technician connects a voltmeter in parallel across two points in a circuit. Technician A says this will provide a reading of the potential difference in volts. Technician B says that this will also show the amperage flowing in the circuit. Who is correct?

Answers

A voltmeter is a device that measures the difference in electric potential between two locations in an electric circuit. Technician A is correct while Technician B is wrong.

What is a voltmeter?

A voltmeter is a device that measures the difference in electric potential between two locations in an electric circuit. It is linked in parallel. It generally has a high resistance and draws very little current from the circuit.

Given the technician connects the voltmeter in parallel across two points in a circuit. Therefore, the technician A is correct the meter will provide a reading of the potential difference in volts.

Hence, Technician A is correct while Technician B is wrong.

Learn more about Voltmeter:

https://brainly.com/question/8505839

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Fizeau’s method for measuring the speed of light using a rotating toothed wheel. The speed of rotation of the wheel controls what an observer sees. For example, if the light passing the opening at point A should return at the instant that tooth B had rotated into position to cover the return path, the light would not reach the observer. At a faster rate of rotation, the opening at point C could move into position to allow the reflected beam to reach the observer. Toothed Wheel Mirror A B C d Calculate the minimum angular speed of the wheel for light that passed through opening A to return through opening C to reach the observer. In an experiment to measure the speed of light using the apparatus of Fizeau, the distance between the toothed wheel and mirror was 10.72 km and the wheel had 671 notches. The experimentally determined value of c was 2.908 × 108 m/s . Answer in units of rad/s.

Answers

Answer:

The minimum angular speed, w is 126.94 rad/s

Explanation:

Given:

C = 2.908×10⁸ m/s

d = 10.72 km ⇒ 10.72×10³ m

There are 671 notches

⇒ Δθ = [tex]\frac{2\pi}{671}[/tex] ==> 9.359×10⁻³ rad

C = 2d / Δt    ⇒    Δt = 2d/C

w = Δθ / Δt = CΔθ / 2d

substitute for given parameters

w = [2.908×10⁸×9.359×10⁻³] / [2×10.72×10³]

   = 27.215972×10⁵ / 21.44×10³

   = 1.2694×10²

w ⇒ 126.94 rad/s

5. A straight round shaft is subjected to a torque of 5000 lb - in. Determine the required diameter, using steel with a tensile yield strength of 60 ksi and a safety factor of 2 based on initial yielding: (a) According to the maximum-normal-stress theory. (b) According to the maximum-shear-stress theory. (c) According to the maximum-distortion-energy theory. Discuss briefly the relative validity of the three predictions.

Answers

Answer:

a. 0.95 in

b. 1.19 in

c. 1.137 in

Explanation:

Express the factor of safety equation for maximum-normal-stress theory as:  

S SF = Eau  

Here, the factor of safety is SF, the yield strength is S„ and the maximum stress :I  

Modify the above equation for shear stress acting on the solid rod as:  

S. SF = To  

Here, the combined shear stress on solid rod s  

Calculate the combined shear stress for solid rod.  

16T r2:1 =  trd3  

(1)  

Here, the torque is T, and the diameter of the solid rod is d.  

Substitute 5,000 'bin. for T.  

— 16(5,000 lb • in ) v  ird 80 000lb - in. _  

rd3  

60ksi 2 —  80,000lb -in. trd  

Solve the above equation for d.  

60 x 1031bAn?  80,00016 -in. ird3 —  2(80, 000 lb in.) d3  rrt60x103Ibfln?)  

v3 d —[  2(80,000lb-in.) rz-(60 x103112,An?) = 0.8488 in.3r3 =0.95 in.  

check the attached files for clear cut details

All areas of the country use a BAC of 0.100.10 ​g/dL as the legal intoxication level. Is it possible that the mean BAC of all drivers involved in fatal accidents who are found to have positive BAC values is less than the legal intoxication​ level? A. ​No, it is not possible. B. ​Yes, but it is not likely. C. ​Yes, and it is highly probable.

Answers

Answer:

C. ​Yes, and it is highly probable.

Explanation:

Null hypothesis, [tex]H_0[/tex] : ц 0.09

Alternative hypothesis, [tex]H_1[/tex]: ц > 0.09

Test statistic is,

x Z =  x - ц / s

[tex]\frac{0.15 - 0.09 }{0.06}[/tex]

[tex]\frac{0.06}{0.06}[/tex]

=1  

The p-value is,  

p = P(Z > z)

=1—P(Z ≤1)

= 1— 0.841345

= 0.158655

(From normal tables)  

The p-value is greater than the significance level, so we fail to reject the null hypothesis. The correct option is, C  

Yes, and it is highly probable.  

(a) Design a half-subtractor circuit with inputs x and y and outputs Diff and B out . The circuit subtracts the bits x – y and places the difference in D and the borrow in B out .
(b) Design a full-subtractor circuit with three inputs x , y , B in and two outputs Diff and B out . The circuit subtracts x – y – B in , where B in is the input borrow, B out is the output borrow, and Diff is the difference.

Answers

Answer:

See the attachment

Explanation:

A half subtractor circuit is made up of on NOT gate, one XOR and one AND gate.

A full subtractor is made up of two half subractor with their outputs in an OR gate for Bout as shown in attachment

A Permanent Electrical Safety Device (PESD) becomes a real safety device only after it is installed as part of a Lockout/Tagout procedure. Until this is done it is nothing but another electrical component.A. TrueB. False

Answers

Answer:

True

Explanation:

Permanent electrical safety devices (PESD) acts as a layer of protection between the electrical worker and the hazardous voltage.

Permanent electrical safety devices (PESDs) are deployed to reduce the risks in isolating electrical energy.

Electrical safety can be improved if a worker determines a zero electrical energy state irrespective of any voltage exposure to themselves.

The given statement is true

Identical wire loops are dipped into liquid a and liquid b, so that a film of liquid forms across the loops (like the bubble solution on a child's bubble blowing wand). the width of each loop is increased slowly and the forces fa and fb needed to make the loops 5% wider are measured.

(a) fa will be greater than fb

(b) fa will be less than fb

(c) fa will be equal to fb

(d) it is impossible to predict whether fa or fb will be greater without more information.

Answers

Final answer:

Without information about the liquids' surface tensions, it is impossible to predict whether Fa will be greater, less, or equal to Fb. Answer (d) is correct.

Explanation:

When analyzing forces on a wire loop in magnetic fields, it's essential to consider various factors including current, magnetic field intensity, and loop dimensions. A uniform magnetic field will exert a force on each segment of the loop carrying a current; this applies to rectangular loops in a magnetic field as noted in the given scenario. The question seems to focus on the force needed to change the width of loops coated with a liquid film and could draw on concepts of surface tension and possibly elasticity if considering the loop's properties themselves. However, the provided text focuses on magnetic effects on current-carrying wires.

For the case of the film across the loop, the necessary force to stretch it will heavily depend on the surface tension of the liquid. Therefore, without information on the liquids' surface tensions or other properties, it is impossible to predict whether Fa will be greater than, less than, or equal to Fb. Answer (d) it is impossible to predict whether Fa or Fb will be greater without more information is the most suitable given the circumstances.

A 15.0 in by 2.0 in work part is machined in a face milling operation using a 2.5 in diameter cutter with a single carbide insert. The machine is set for a feed of 0.010 in/tooth and a depth of 0.20 in. If a cutting speed of 400 ft/min is used, the tool lasts for 3 pieces. If a cutting speed of 200 ft/min it used, the tool lasts for 12 parts. Determine the Taylor tool life equation. (20 points)

Answers

Answer:

Explanation:

N1 =v/πD = 400(12)/2.5π = 611 rev/min fr = Nfnt = 611(0.010)(1) = 6.11 in/min A=D/2 = 2.50 / 2 = 1.25 Tm = (L+2A)/fr = (15 + 2(1.25))/6.11 = 2.863 min T1 = 3Tm = 3(2.863) = 8.589 min when v1 = 400 ft/min N2 = 200(12)/2.5π = 306 rev/min fr = Nfnt = 306(0.010)(1) = 3.06 in/min Tm = (15 + 2(1.25))/3.06 = 5.727 min T2 = 12Tm = 12(5.727) = 68.724 min when v2 = 200 ft/min n = ln (v1/v2)/ln(T2/T1) = ln (400/200)/ln (68.724/8.589) = 0.333 C = vTn = 400(8.589 )0.333 = 819

Answer:

C = 787.2

Explanation:

The Taylor tool life is referred to as the duration of the actual cutting time after which the tool can no longer be used.

To Quantify the end of a tool life we equate it to a limit on the maximum acceptable flank wear.

For the tool life equation, With the slope, n and intercept, c, Taylor derived the simple equation as

VTn = C where.

n is called, Taylor's tool life exponent. The values of both 'n' and 'c' depend mainly upon the tool-work materials and the cutting environment (cutting flake application)

Please kindly go through the attached file for a step by step solution to how the answer to your question is solved.

You need to display output for all of the values between the starting and ending values. First two values are temperatures in Fahrenheit. You need to display all of the values from the first temperature to the last temperature. You increment from one temperature to the next by the increment value (the third value you read in). You need to convert these temperatures to Celsius and Kelvin. You need to output the temperatures as Fahrenheit, Celsius, and Kelvin. The numbers should be 18 characters wide with 4 digits of precision and need to be in fixed format. Do not use tab characters (\t) to output the values.

Answers

Answer:

Check the explanation

Explanation:

#include<iostream>

#include<iomanip>

using namespace std;

int main()

{

double temp1,temp3,inc,cel;

int i=1;

while(i==1)

{

i=0;

cin>>temp1>>temp3>>inc;

if(temp3<temp1||inc<=0)

{

i=1;

cout<<"Starting temperature must be <= ending temperature and increment must be >0.0\n";

}

}

cout<<endl;

cout<<setw(18)<<"Fahrenheit"<<setw(18)<<"Celsius";

while(temp1<=temp3)

{

cel=(temp1-32)/1.8;

cout<<endl;

cout<<fixed<<setprecision(4)<<setw(18)<<temp1<<setw(18)<<cel;

temp1+=inc;

}

}

A year in the modern Gregorian Calendar consists of 365 days. In reality, the earth takes longer to rotate around the sun. To account for the difference in time, every 4 years, a leap year takes place. A leap year is when a year has 366 days: An extra day, February 29th. The requirements for a given year to be a leap year are: The year must be divisible by 4 If the year is a century year (1700, 1800, etc.), the year must be evenly divisible by 400 Some example leap years are 1600, 1712, and 2016. Write a program that takes in a year and determines whether that year is a leap year. Ex: If the input is 1712, the output is: 1712 is a leap year. Ex: If the input is 1913, the output is: 1913 is not a leap year.

Answers

Answer:

Explanation:

def is_leap_year(year):

   if(year % 400 == 0):

       return True

   elif year % 100 == 0:

       return False

   elif year%4 == 0:

       return True

   else:

       return False  

if __name__ == '__main__':

   n = int(input())

   if(is_leap_year(n)):

       print(n,"- leap year")

   else:

       print(n, "- not a leap year")

check the attachment for the output

Answer:

def is_leap_year(year):

  if(year % 400 == 0):

      return True

  elif year % 100 == 0:

      return False

  elif year%4 == 0:

      return True

  else:

      return False  

if __name__ == '__main__':

  n = int(input())

  if(is_leap_year(n)):

      print(n,"is a leap year.")

  else:

      print(n, "- not a leap year")

Explanation:

An actuator has a stem movement which at full travel is 40 mm. It is mounted on a process control valve with an equal percentage plug and which has a minimum flow rate of 0.2 m3/s and a maximum flow rate of 4.0 m3/s. What will be the flow rate when the stem movement is (a) 10 mm, (b) 20 mm

Answers

Answer:

a) for a stem of 10 mm the flow rate is 0.4229 m³/s

b) for a stem of 20 mm the flow rate is 0.8944 m³/s

Explanation:

The mathematical expression for the flow rate is:

[tex]Q=Q_{min} *(\frac{Q_{max} }{Q_{min} } )^{\frac{S-S_{min}}{S_{max}-S_{min} } }[/tex]

a) Here:

Qmin=0.2m³/s

Qmax=4m³/s

Smax-Smin=40mm

S-Smin=10mm

Substituting these values ​​in the first equation:

[tex]Q=0.2*(\frac{4}{0.2} )^{\frac{10}{40} } =0.4229m^{3} /s[/tex]

b) In this time, S-Smin=20mm

[tex]Q=0.2*(\frac{4}{0.2} )^{\frac{20}{40} } =0.8944m^{3} /s[/tex]

Modify any of the previous labs which would have crashed when non-numeric data was entered by adding exception handling so that the non-numeric input no longer crashes the program. The program must handle the invalid input gracefully by informing the user of the bad input and re-querying until the user provides valid input. It must re-query for the specific input which was incorrectly entered.

Answers

Answer:

see explaination

Explanation:

import java.util.InputMismatchException;

import java.util.Scanner;

public class calculate {

static float a=0,b=0;

double cal()

{

if(a==0||b==0)

{

System.out.println("no values found in a or b");

start();

}

double x=(a*a)+(b*b);

double h=Math.sqrt(x);

a=0;

b=0;

return h;

}

float enter()

{

float val=0;

try

{

System.out.println("Enter side");

Scanner sc1 = new Scanner(System.in);

val = sc1.nextFloat();

return val;

}

catch(InputMismatchException e)

{

System.out.println("Enter correct value");

}

return val;

}

void start()

{

calculate c=new calculate();

while(true)

{

System.out.println("Enter Command");

Scanner sc = new Scanner(System.in);

String input = sc.nextLine();

switch(input)

{

case "A":

a=c.enter();

break;

case "B":

b=c.enter();

break;

case "C":

double res=c.cal();

System.out.println("Hypotenuse is : "+res);

break;

case "Q":

System.exit(0);

default:System.out.println("wrong command");

}

}

}

public static void main(String[] args) {

calculate c=new calculate();

c.start();

}

}

"At 195 miles long, and with 7,325 miles of coastline, the Chesapeake Bay is the largest and most complex estuary in the United States.Though long and wide (30 miles wide at the Potomac River), the bay is very shallow, with an average depth of only 28 feet." The Bay's maximum depth is 174 ft. The hydraulic model of the Chesapeake Bay was built with a model length ratio Lr=1/1000

a. How wide was the model Bay [ft] at the Potomac River?
b. The Bay Bridge is 4.3 miles long; how long was it in the model [ft]?
c. If the hydraulic model occupied about 8 acres, approximately what is the real-world (prototype) area represented by the model [square miles]?
d. At this scale, what would be the average depth and maximum depth of the model Bay? [give answers in both ft and inches)

Answers

Answer:

see explaination

Explanation:

Part a) Width of bay at Potomac River:

Given Data:

· Actual Width at Potomac River = 30 miles

· Bay Model Length Ratio Lr = 1/1000

In fluid mechanics models of real structures are prepared in simulation so that they can be analyzed accurately. A model is known to have simulation if model carries same geometric, kinematic and dynamic properties at a small scale.

Length of any part in model = Actual length x Lr

Hence,

Model Width of bay at Potomac River = 30 x 1/1000 = 0.03 miles

Since 1 mile = 5280 ft

Model Width of bay at Potomac River = 0.03 x 5280 = 158.4 ft

Part b) Model Length of bay bridge in model:

Given Data:

· Actual Length of bay bridge = 4.3 miles

· Bay Model Length Ratio Lr = 1/1000

Model Length = Actual Length x Lr = 4.3 x 1/1000 = 0.0043 miles

Since 1 mile = 5280 ft

Model Length in feet = 0.0043 x 5280 = 22.704 ft

Part c) Model Length of bay bridge in model:

Given Data:

· Model Area = 8 acre

· Bay Model Length Ratio Lr = 1/1000

Model Area = Actual Area x Lr x Lr

8 Model Area :: Actual Area =- (Lp)2 2 = 8,000,000 acre 1000

Since 1 square mile = 640 acre,

Actual Area in square miles = 8,000,000/640 = 12,500 square miles

Part d) Average and maximum depth of model:

Given Data:

· Actual Average depth = 28 ft

· Actual Maximum depth = 174 ft

· Bay Model Length Ratio Lr = 1/1000

Model average depth = Actual average depth x Lr = 28 x 1/1000 = 0.028 feet

Since 1 ft = 12 inch

Model average depth in inch = 0.028 x 12 = 0.336 in

Model maximum depth = Actual maximum depth x Lr = 174 x 1/1000 = 0.174 feet

Since 1 ft = 12 inch

Model maximum depth in inch = 0.174 x 12 = 2.088 in

Using a forked rod, a smooth 3-lb particle is forced to move along around the horizontal path in the shape of a limaçon, r = (5+sin θ) ft. If θ =LaTeX: \frac{1}{8}t^21 8 t 2 rad, where t is in seconds, determine the force of the rod and the normal force of the slot on the particle at the instant t= 3sec. The fork and path contact the particle on only one side.

Answers

Answer:

See explaination

Explanation:

Please kindly check attachment for the step by step solution of the given problem.

The detailed solution is in the attached file

Let f(t) be an arbitrary signal with bandwidth Ω. Determine the minimum sampling frequencies ωs needed to sample the following analog signals without causing aliasing error. (a) f1(t) = f(t) sin(4000πt) (b) f2(t) = f(t) ∗ sin(4000πt) (c) f3(t) = f(t) ∗ f(sample the following analog signals without causing aliasing error

Answers

Answer:

See explaination

Explanation:

We can describr Aliasing as a false frequency which one get when ones sampling rate is less than twice the frequency of your measured signal.

please check attachment for the step by step solution of the given problem.

11.4 Compute the volume percent of graphite VGr in a 3.5 wt% C cast iron, assuming that all the carbon exists as the graphite phase. Assume densities of 7.9 and 2.3 g/cm3 for ferrite and graphite, respectively.

Answers

Answer:

The volume percent of graphite in a 3.5 wt% C cast iron is 11%.

Explanation:

Consider 100 grams 3.5% C cast iron.

Mass of  carbon in 100 grams of cast iron = [tex]m_1=100 g\times \frac{3.5 }{100}=3.5 g[/tex]

Mass of iron in cast iron =[tex]m_2[/tex] = 100 g - 3.5 g = 96.5 g

Density of graphite = [tex]d_1=2.3g/cm^3[/tex]

Volume of the graphite = [tex]v_1[/tex]

[tex]v_1=\frac{m_1}{d_1}=\frac{3.5 g}{2.3g/cm^3}=1.52 cm^3[/tex]

Density of iron= [tex]d_2=7.9 g/cm^3[/tex]

Volume of the iron = [tex]v_2[/tex]

[tex]v_2=\frac{m_2}{d_2}=\frac{96.5 g}{7.9 g/cm^3}=12.22 cm^3[/tex]

Total volume of the cast iron ,V=[tex]v_1+v_2=1.52 cm^3+12.22 cm^3=13.74 cm^3[/tex]

Volume percent of the graphite :

[tex]=\frac{v_1}{V}\times 100[/tex]

[tex]=\frac{1.52 cm^3}{13.74 cm^3}\times 100=11.06\%\approx 11\%[/tex]

The volume percent of graphite in a 3.5 wt% C cast iron is 11%.

The volume percent of graphite VGr in a 3.5 wt% C cast iron is;

V_gr = 11.08%

We are given;

Density of Ferrite; ρₐ = 7.9 g/cm³

Density of Graphite; [tex]\rho _{g}[/tex] = 2.3 g/cm³

Weight percent of C cast iron; C₀ = 3.5%

Now the formula for the mass fraction of ferrite is;

Wₐ = [tex]\frac{C_{g} - C_{0}}{C_{g} - C_{a}}[/tex]

If we consider 100 g of 3.5 wt% C cast iron, then [tex]C_{g}[/tex] = 100 and Cₐ = 0

Thus;

Wₐ = [tex]\frac{100 - 3.5}{100 - 0}[/tex]

Wₐ = 0.965

Thus, mass fraction of graphite is;

[tex]W _{g}[/tex] = 1 -  Wₐ

[tex]W _{g}[/tex] = 1 -  0.965

[tex]W _{g}[/tex] = 0.035

Formula for the volume percent of graphite is;

[tex]V_{gr} = \frac{\frac{W_{g}}{\rho_{g}}}{\frac{W_{a}}{\rho_{a}} + \frac{W_{g}}{\rho_{g}}} * 100%[/tex]

Plugging in the relevant values gives;

V_gr = [(0.035/2.3)/((0.965/7.9) + (0.035/2.3))]

V_gr = 0.01521739/(0.1221518987 + 0.01521739)

V_gr = 11.08%

Read more about volume percent at; https://brainly.com/question/17034557

Consider a low speed open circuit subsonic wind tunnel with an inlet to throat area ratio of 12. The tunnel is turned on and the pressure difference between the inlet (the settling chamber) and the test section is read as a height difference of 10 cm on a U-tube mercury manometer. (The density of liquid mercury is 1.36 x 10-4 kg/m3 ). Calculate the velocity of the air in the test section.

Answers

Answer:

velocity = 147.57 m/s

Explanation:

given data

inlet to throat area ratio = 12

height difference Δh = 10 cm = 0.1 m

density of liquid mercury = 1.36 × [tex]10^{4}[/tex] kg/m³

solution

we get here weight of mercury that is express as

weight of mercury = density of liquid mercury ×  g    .................1

weight of mercury = 1.36 × [tex]10^{4}[/tex] × 9.8

weight of mercury = 1.33 × [tex]10^{5}[/tex]  N/m²  

and

area ratio is

[tex]\frac{a1}{a2}[/tex]  = 12

so velocity of air in the test section will be

velocity = [tex]\sqrt{\frac{2\times w \times \triangle h}{\rho (1-(area\ ration)^2)}}[/tex]      .......................1

put here value and we get

velocity = [tex]\sqrt{\frac{2\times 1.33\times 10^5 \times 0.1}{1.23 (1-(\frac{1}{12})^2)}}[/tex]    

velocity = 147.57 m/s

The velocity of air in the test section is; v = 147.802 m/s

Velocity of air

We are given;

inlet to throat area ratio; a1/a2 = 12height difference Δh = 10 cm = 0.1 mdensity of liquid mercury; ρ = 1.36 × 10⁴ kg/m³

Thus, weight of mercury is;

W = ρg

W = 1.36 × 10⁴ × 9.8

W = 13.328 × 10⁴ N/m²

Formula for the velocity of the air in the test section is;

v = √[(2ρgΔh)/(ρ_air × (1 - a2/a1)]

Where ρ_air is density of air = 1.23 kg/m³

Thus;

v = √[(2 × 1.36 × 10⁴ × 9.8 × 0.1)/(1.23 × (1 - 1/12)]

Solving this gives us;

v = 147.802 m/s

Read more on Velocity at; https://brainly.com/question/4931057

A bar of steel has the minimum properties Se = 40 kpsi, S = 60 kpsi, and S-80 kpsi. The bar is subjected to a steady torsional stress of 15 kpsi and an alternating bending stress of 25 kpsi Find the factor of safety guarding against a static failure, and either the factor of safety guard- ing against a fatigue failure or the expected life of the part. For the fatigue analysis use:


(a) Modified Goodman criterion.

(b) Gerber criterion.

(C) ASME-elliptic criterion.

Answers

Answer:

(a) Modified Goodman criterion:

Factor of safety against fatigue failure =  1.0529

(b) Gerber criterion:

Factor of safety against fatigue failure = 1.31

(c) ASME-elliptic criterion:

Factor of safety against fatigue failure = 1.315

Explanation:

See the attached file for the calculation.

(a) Modified Goodman: SF ≈ 1.264, Static FS ≈ 2.058.

(b and c ) Gerber & ASME-elliptic: SF ≈ 1.783, Static FS ≈ 2.058.

To calculate the factor of safety against static and fatigue failures using different criteria, we need to determine the critical stress limits under the given loading conditions and compare them with the material properties.

Given:

- Torsional stress [tex](\( \tau \))[/tex] = 15 kpsi

- Alternating bending stress [tex](\( \sigma_a \))[/tex] = 25 kpsi

- Minimum endurance limit [tex](\( S_e \))[/tex] = 40 kpsi

- Ultimate tensile strength [tex](\( S \))[/tex] = 60 kpsi

- Endurance limit for reversed bending [tex](\( S_{-80} \))[/tex] = 80 kpsi

(a) Modified Goodman criterion:

The modified Goodman criterion accounts for both tensile and torsional stress, given by:

[tex]\[ \frac{1}{SF} = \frac{\frac{\sigma_a}{S} + \frac{\tau}{S_e}}{1} \][/tex]

Where [tex]\( SF \)[/tex] is the safety factor against fatigue failure.

Substitute the given values:

[tex]\[ \frac{1}{SF} = \frac{\frac{25}{60} + \frac{15}{40}}{1} \][/tex]

[tex]\[ \frac{1}{SF} = \frac{0.4167 + 0.375}{1} \][/tex]

[tex]\[ \frac{1}{SF} = 0.7917 \][/tex]

[tex]\[ SF = \frac{1}{0.7917} \][/tex]

[tex]\[ SF \approx 1.264 \][/tex]

The factor of safety against static failure [tex](\( FS_{static} \))[/tex] can be calculated by comparing the maximum applied stress with the ultimate tensile strength:

[tex]\[ FS_{static} = \frac{S}{\sigma_{max}} \][/tex]

[tex]\[ FS_{static} = \frac{60}{\sqrt{\sigma_a^2 + \tau^2}} \][/tex]

[tex]\[ FS_{static} = \frac{60}{\sqrt{25^2 + 15^2}} \][/tex]

[tex]\[ FS_{static} = \frac{60}{\sqrt{625 + 225}} \][/tex]

[tex]\[ FS_{static} = \frac{60}{\sqrt{850}} \][/tex]

[tex]\[ FS_{static} \approx \frac{60}{29.1547} \][/tex]

[tex]\[ FS_{static} \approx 2.058 \][/tex]

(b) Gerber criterion:

The Gerber criterion considers the bending and torsional stresses, given by:

[tex]\[ \frac{1}{SF} = \sqrt{\frac{\sigma_a^2}{S^2} + \frac{\tau^2}{S_e^2}} \][/tex]

Substitute the given values:

[tex]\[ \frac{1}{SF} = \sqrt{\frac{25^2}{60^2} + \frac{15^2}{40^2}} \][/tex]

[tex]\[ \frac{1}{SF} = \sqrt{\frac{625}{3600} + \frac{225}{1600}} \][/tex]

[tex]\[ \frac{1}{SF} = \sqrt{0.1736 + 0.1406} \][/tex]

[tex]\[ \frac{1}{SF} = \sqrt{0.3142} \][/tex]

[tex]\[ \frac{1}{SF} \approx 0.5608 \][/tex]

[tex]\[ SF \approx \frac{1}{0.5608} \][/tex]

[tex]\[ SF \approx 1.783 \][/tex]

(c) ASME-elliptic criterion:

The ASME-elliptic criterion also considers bending and torsional stresses:

[tex]\[ \frac{1}{SF} = \sqrt{\left(\frac{\sigma_a}{S}\right)^2 + \left(\frac{\tau}{S_e}\right)^2} \][/tex]

Substitute the given values:

[tex]\[ \frac{1}{SF} = \sqrt{\left(\frac{25}{60}\right)^2 + \left(\frac{15}{40}\right)^2} \][/tex]

[tex]\[ \frac{1}{SF} = \sqrt{0.1736 + 0.1406} \][/tex]

[tex]\[ \frac{1}{SF} = \sqrt{0.3142} \][/tex]

[tex]\[ \frac{1}{SF} \approx 0.5608 \][/tex]

[tex]\[ SF \approx \frac{1}{0.5608} \][/tex]

[tex]\[ SF \approx 1.783 \][/tex]

For all three criteria:

- Factor of safety against static failure [tex](\( FS_{static} \))[/tex] ≈ 2.058

- Safety factor against fatigue failure [tex](\( SF \))[/tex] ≈ 1.264 for the Modified Goodman criterion, and ≈ 1.783 for the Gerber and ASME-elliptic criteria.

Hydroelectric power plants convert the gravitational potential energy of falling water into electrical power, typically by allowing the water to flow through a pipe called a penstock to rotate a generator located below it. Let the bottom of the penstock be the origin of a Cartesian coordinate system and the point at which the gravitational potential energy is zero.
a) Consider a penstock that is vertical and has a height of h = 61 m. How long, t in seconds, does it take water to fall from the top of the penstock to the bottom? Assume the water starts at rest.

Answers

Answer:

  3.527 seconds

Explanation:

The height of the falling water, assuming no friction or air resistance, is given by ...

  h(t) = -(1/2)gt² +61

where g is the standard gravity value, 9.80665 m/s².

The the time required for h(t) = 0 is ...

  1/2gt² = 61

  t² = 2·61/g

  t = √(2·61/9.80665) ≈ 3.527 . . . . seconds

A photovoltaic panel of dimensions 6 m x 5 m is located on top of the roof of a house. Solar irradiation Gs = 900 W/m2 is incident on the panel. The panel has an absorptivity to solar irradiation, αs of 0.92. The freestream air temperature is Tinf and the surrounding temperature for radiation exchange with the sky is Tsurr. For this particular problem, it is given that Tinf= Tsurr. The convective heat transfer coefficient of air blowing over the panel is h W/m2-K.

Answers

Answer:

2.7 W/m^2K

Explanation:

Area of pane = 5 m x 6 m = 30 m^2

Solar irradiation Gs = 900 W/m2

Heat rate on panel = Gs x area = 900 x 30 = 27000 W

absorptivity to solar irradiation αs = 0.92

Therefore, absorbed heat is

0.92 x 27000 = 24840 W

For heat gain,

From E = §AT^4

Where § = stefan's constant = 5.7x10^-8 Wm^-2K^-1

T = temperature of panel

24840 = 5.7x10^-8 x 30 x T^4

24840 = 1.71x10^-6 x T^4

1.453x10^10 = T^4

T = 347.167 K

For net heat gain,

From E = §A(T^4 - T^4sur)

24840 = 5.7x10^-8 x 30 x (T^4 - T^4sur)

24840 = 1.71x10^-6 x (1.453x10^10 - T^4sur)

24840 = 24846.3 - 1.71x10^-6(T^4sur)

-6.3 = -1.71x10^-6(T^4sur)

3684210.526 = T^4sur

Tsur = 43.81 K

Also for convective heat,

E = Ah(T - Tsur)

24840 = 30h(347.167 - 43.81)

24840 = 30h x 303.357

81 = 30h

h = 2.7 W/m^2K

Air from a workspace enters the air conditioner unit at 30°C dry bulb and 25°C wet bulb temperatures. The air leaves the air conditioner and returns to the space at 25°C dry bulb and 6.5°C dew point temperature (ϕ2≠100%). If there is any, the condensate leaves the air conditioner at the same temperature of the air leaving the cooling coils (i.e., different from our previous assumption that condensate has same temperature of the cooling coils). The volume flow rate of the air returned to the workspace is 1000 m3 /min (Rair=0.287 kJ/kg∙K). Atmospheric pressure is 101.325 kPa. Compute

Answers

Answer:

See explaination

Explanation:

The volume flow rate Q Q QQ of a fluid is defined to be the volume of fluid that is passing through a given cross sectional area per unit time.

Kindly check attachment for the step by step solution of the given problem.

1. A copper block of volume 1 L is heat treated at 500ºC and now cooled in a 200-L oil bath initially at 20◦C. Assuming no heat transfer with the surroundings, what is the final temperature?

Answers

Answer:

final temperature T = 24.84ºC

Explanation:

given data

copper volume = 1 L

temperature t1 = 500ºC

oil volume = 200 L

temperature t2 = 20ºC

solution

Density of copper [tex]\rho[/tex] cu = 8940 Kg/m³

Density of light oil  [tex]\rho[/tex] oil = 889 Kg/m³

Specific heat capacity of copper Cv = 0.384  KJ/Kg.K

Specific heat capacity of light oil Cv = 1.880 KJ/kg.K

so fist we get here mass of oil and copper that is

mass = density × volume   ................1

mass of copper = 8940 × 1 ×  [tex]10^{-3}[/tex]  = 8.94 kg  

mass of oil = 889 × 200 × [tex]10^{-3}[/tex]  =  177.8 kg  

so we apply here now energy balance equation that is

[tex]M(cu)\times Cv \times (T-T1)_{cu} + M(oil) \times Cv\times (T-T2)_{oil}[/tex]  = 0

put here value and we get T2

[tex]8.94\times 0.384 \times (T-500) + 177.8 \times 1.890\times (T-20)[/tex]  = 0

solve it we get

T = 24.84ºC

Technician A says the small base circuit of a transistor controls current flow. Technician B says the small emitter circuit controls current flow. Who is right?

Answers

Answer:

A

Explanation:

Technician A says the small base circuit of a transistor controls current flow. Technician B says the small emitter circuit controls current flow Person A is right.

Who is technician?

A technician is a worker in the technology industry who possesses the necessary knowledge, abilities, and skills as well as a practical comprehension of the theoretical underpinnings.

Expert technicians in a certain tool domain often have expert competency in technique and a moderate comprehension of theory. As a result, technicians in that field of technology are typically much more knowledgeable about technique than the average layperson and even general professionals.

For instance, although not as knowledgeable in acoustics as acoustical engineers, audio technicians are more adept at using sound equipment and are likely to know more about acoustics than other studio staff members, such as performers.

Therefore, Technician A says the small base circuit of a transistor controls current flow. Technician B says the small emitter circuit controls current flow Person A is right.

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A student is working with three sealed containers filled with water. The first container is filled with ice. The second is filled with liquid water, and the third is filled with water vapor. Each container has a plunger on top. What will happen to the volumes of each container when the student presses the plungers

Answers

Explanation:

The three containers each contains water in different states.

Solid state of matter is considered as not compressible because the molecules are already as closely packed as they can be.

The liquid sate of matter has a very minute to no compression ability at all as the molecules are relatively close to each other. Compression is difficult to achieve in the liquid state.

In the gaseous state of matter, the molecules have broken free of one another, and are fairly spaced one from another. This means that gases can be easily compressed.

Pressing down on the plunger, the container containing ice can't be compressed at all so it's volume stays the same.

For the container filled with water, only a minute compression can be achieved with great difficulty hence, the volume reduces by an insignificant amount.

For the container filled with vapour, compression can be easily achieved and the volume reduces significantly.

Only the volume of the third container will decrease.

What happens when the student plungers at the top of the container?

There are three containers and each has water in three different states. Solid-state of the matter is ice as they are closely packed.

The liquid state is minute and has molecules that are relatively close to other, Compression is thus difficult to achieve.

The last state has water in gases matter and can be compressed easily.

Thus the volume of the third container will go down.

Find out more information about liquid water.

brainly.com/question/2608851.

Summary: Given integer values for red, green, and blue, subtract the gray from each value. Computers represent color by combining the sub-colors red, green, and blue (rgb). Each sub-color's value can range from 0 to 255. Thus (255, 0, 0) is bright red, (130, 0, 130) is a medium purple, (0, 0, 0) is black, (255, 255, 255) is white, and (40, 40, 40) is a dark gray. (130, 50, 130) is a faded purple, due to the (50, 50, 50) gray part. (In other words, equal amounts of red, green, blue yield gray). Given values for red, green, and blue, remove the gray part. Ex: If the input is 130 50 130, the output is: 80 0 80 Find the smallest value, and then subtract it from all three values, thus removing the gray. Note: This page converts rgb values into colors.

Answers

Answer:

answer is given below

Explanation:

we write this program in C++  that is given below  

and result is attach here

#include <iostream>

using namespace std;

int main() {

int r,g,b,small;

//input values

cin>>r>>g>>b;

//find the smallest value

if(r<g && r<b)

small=r;

else if(g<b)

small=g;

else

small=b;

//subtract smallest of the three values from rgb values hence removing gray

r=r-small;

g=g-small;

b=b-small;

cout<<r<<" "<<g<<" "<<b<<endl;

}

We can see here that the Python code is thus:

# Read input values for red, green, and blue

red, green, blue = map(int, input().split())

# Find the smallest value among red, green, and blue

smallest = min(red, green, blue)

# Subtract the smallest value from all three colors

red -= smallest

green -= smallest

blue -= smallest

# Output the modified values

print(red, green, blue)

Assuming the input values for red, green, and blue are 50, 30, and 40 respectively, the output will be:

10  0  10

This is because:

The smallest value among 50, 30, and 40 is 30.

Subtracting 30 from each color gives:

red = 50 - 30 = 20green = 30 - 30 = 0blue = 40 - 30 = 10

The output displays the modified values: 20 0 10

To implement this functionality in Python, you can follow these steps:

Read the input values for red, green, and blue.Find the smallest value among red, green, and blue.Subtract the smallest value from all three colors.Output the modified values.

Koch traded Machine 1 for Machine 2 when the fair market value of both machines was $60,000. Koch originally purchased Machine 1 for $76,900, and Machine 1's adjusted basis was $40,950 at the time of the exchange. Machine 2's seller purchased it for $64,050 and Machine 2's adjusted basis was $55,950 at the time of the exchange. What is Koch's adjusted basis in machine 2 after the exchange?

Answers

Answer:

Koch's adjusted basis in machine 2 after the exchange is $60,000

Explanation:

given data

fair market value = $60,000

originally purchased Machine 1 = $76,900

Machine 1 adjusted basis = $40,950

Machine 2 seller purchase = $64,050

Machine 2 adjusted basis = $55,950

solution

As he exchanged machine for another at $60,000

and this exchanged in fair market

so adjusted basis =  $50,000

Adjusted basis is the price of the item that affects the factors that are considered price. These factors usually include taxes, depreciation value, and other costs of acquiring and maintaining a given item. Adjusted basis is important so the right amount to sell

Adjusted basis increases when a person deducts expenses from factor taxes and operating statements

so Koch's adjusted basis in machine 2 after the exchange is $60,000

A convergentâdivergent nozzle has an exit area to throat area ratio of 4. It is supplied with air from a large reservoir in which the pressure is kept at 500 kPa and it discharges into another large reservoir in which the pressure is kept at 10 kPa. Expansion waves form at the exit edges of the nozzle causing the discharge flow to be directed outward.
(a) Find the angle that the edge of the discharge flow makes to the axis of the nozzle.

Answers

Answer:

Angle of discharge make at the edge of tube=64.9 degrees.

investigation, determine when the Elastic Potential Energy is zero. Make sure you test your idea with several masses, all three springs and vary the stiffness of spring three. Write down how you determined the zero location(s) and explain why the position for zero makes sense.

Answers

Elastic Potential Energy is zero detailed description is given below.

Explanation:

It is the energy stored in stretched or compressed elastic materials. This also means that elastic potential energy is zero in objects that have not been stretched or compressed.To determine the gravitational potential energy of an object, a zero height position must first be arbitrarily assigned. Typically, the ground is considered to be a position of zero height. But this is merely an arbitrarily assigned position that most people agree upon. Since many of our labs are done on tabletops, it is often customary to assign the tabletop to be the zero height position. Again this is merely arbitrary. If the tabletop is the zero position, then the potential energy of an object is based upon its height relative to the tabletop. For example, a pendulum bob swinging to and from above the tabletop has a potential energy that can be measured based on its height above the tabletop. By measuring the mass of the bob and the height of the bob above the tabletop, the potential energy of the bob can be determined.

Potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height. An object possesses elastic potential energy if it is at a position on an elastic medium other than the equilibrium position.

Since the gravitational potential energy of an object is directly proportional to its height above the zero position, a doubling of the height will result in a doubling of the gravitational potential energy. A tripling of the height will result in a tripling of the gravitational potential energy.

When The Elastic Potential Energy is zero are detailed description is given below. When It is the energy stored in stretched elastic materials. It means that The elastic potential energy is zero in objects that have not been stretched or compressed. Now we determine the gravitational potential energy of an object, When a zero height position it must take first be arbitrarily assigned. Then are Typical, the ground is considered to be a position of zero height. When we are measuring the mass of the bob and the height of the bob above the tabletop, then the potential energy of the bob can be determined. Although that the Potential energy is stored in an object due to its position relative to some zero position. Now, An object possesses the gravitational to potential energy if it is positioned at a height above when its zero height. Thus, An object possesses elastic potential energy yet if it is at a position on an elastic medium other than the equilibrium position. After that the gravitational potential energy of an object is directly proportional to its height above the zero position, and also a doubling of the height the result will be in a doubling of the gravitational potential energy. when A tripling of the height will be the result in a tripling of the gravitational to the potential energy.

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Air flows through a 0.25-m-diameter duct. At the inlet the velocity is 300 m/s, and the stagnation temperature is 90°C. If the Mach number at the exit is 0.3, determine the direction and the rate of heat transfer. For the same conditions at the inlet, determine the amount of heat that must be transferred to the system if the flow is to be sonic at the exit of the duct.

Answers

Answer:

a. 318.2k

b. 45.2kj

Explanation:

Heat transfer rate to an object is equal to the thermal conductivity of the material the object is made from, multiplied by the surface area in contact, multiplied by the difference in temperature between the two objects, divided by the thickness of the material.

See attachment for detailed analysis

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