How can I use the flux density B formula if I don’t know magnetic flux

How would I find the Voltage across the open circuit

Nimfa-mama [501]

Answer:

Vab = 80V

Explanation:

The only current flowing in the circuit is supplied by the 100 V source. Its only load is the 40+60 ohm series circuit attached, so the current in that loop is (100V)/(40+60Ω) = 1A. That means V1 = (1A)(60Ω) = 60V.

Vab will be the sum of voltages around the right-side "loop" between terminals 'a' and 'b'. It is (working clockwise from terminal 'b') ...

Vab = -10V +60V +(0A×10Ω) +30V

Vab = 80V

3 0

2 years ago

Air at 293k and 1atm flow over a flat plate at 5m/s. The plate is 5m wide and 6m long. (a) Determine the boundary layer thicknes

loris [4]

Answer:

a). 8.67 x $10^{-3}$ m

b).0.3011 m

c).0.0719 m

d).0.2137 N

e).1.792 N

Explanation:

Given :

Temperature of air, T = 293 K

Air Velocity, U = 5 m/s

Length of the plate is L = 6 m

Width of the plate is b = 5 m

Therefore Dynamic viscosity of air at temperature 293 K is, μ = 1.822 X $10^{-5}$ Pa-s

We know density of air is ρ = 1.21 kg / $m^{3}$

Now we can find the Reyonld no at x = 1 m from the leading edge

Re = $\frac{\rho .U.x}{\mu }$

Re = $\frac{1.21 \times 5\times 1}{1.822\times 10^{-5} }$

Re = 332052.6

Therefore the flow is laminar.

Hence boundary layer thickness is

δ = $\frac{5.x}{\sqrt{Re}}$

= $\frac{5\times 1}{\sqrt{332052.6}}$

= 8.67 x $10^{-3}$ m

a). Boundary layer thickness at x = 1 is δ = 8.67 X $10^{-3}$ m

b). Given Re = 100000

Therefore the critical distance from the leading edge can be found by,

Re = $\frac{\rho .U.x}{\mu }$

100000 = $\frac{1.21\times5\times x}{1.822 \times10^{-5}}$

x = 0.3011 m

c). Given x = 3 m from the leading edge

The Reyonld no at x = 3 m from the leading edge

Re = $\frac{\rho .U.x}{\mu }$

Re = $\frac{1.21 \times 5\times 3}{1.822\times 10^{-5} }$

Re = 996158.06

Therefore the flow is turbulent.

Therefore for a turbulent flow, boundary layer thickness is

δ = $\frac{0.38\times x}{Re^{\frac{1}{5}}}$

= $\frac{0.38\times 3}{996158.06^{\frac{1}{5}}}$

= 0.0719 m

d). Distance from the leading edge upto which the flow will be laminar,

Re = $\frac{\rho \times U\times x}{\mu }$

5 X $10^{5}$ = $\frac{1.21 \times 5\times x}{1.822\times 10^{-5}}}$

x = 1.505 m

We know that the force acting on the plate is

$F_{D}$ = $\frac{1}{2}\times C_{D}\times \rho \times A\times U^{2}$

and $C_{D}$ at x= 1.505 for a laminar flow is = $\frac{1.328}{\sqrt{Re}}$

= $\frac{1.328}{\sqrt{5\times10 ^{5}}}$

= 1.878 x $10^{-3}$

Therefore, $F_{D}$ = $\frac{1}{2}\times C_{D}\times \rho \times A\times U^{2}$

= $\frac{1}{2}\times 1.878\times 10^{-3}\times 1.21\times (5\times 1.505)\times 5^{2}$

= 0.2137 N

e). The flow is turbulent at the end of the plate.

Re = $\frac{\rho \times U\times x}{\mu }$

= $\frac{1.21 \times 5\times 6}{1.822\times 10^{-5} }$

= 1992316

Therefore $C_{D}$ = $\frac{0.072}{Re^{\frac{1}{5}}}$

= $\frac{0.072}{1992316^{\frac{1}{5}}}$

= 3.95 x $10^{-3}$

Therefore $F_{D}$ = $\frac{1}{2}\times C_{D}\times \rho\times A\times U^{2}$

= $\frac{1}{2}\times 3.95\times 10^{-3}\times 1.21\times (5\times 6)\times 5^{2}$

= 1.792 N

3 0

3 years ago

Independent auto lots usually have ____ finance rates than dealerships

wel

Independent auto lots usually have higher finance rates than dealerships

Explanation:

The finance rates that are charged by the dealers are lower than the finance charges that are charged by the independent auto. In case if you are getting financed through dealerships, you can also negotiate with them to charge finance rates and lower the charges of the finance.

But this negotiation and lowering of the finance rates is not possible with the independent auto lots and thus they charge higher rates compared to the dealerships.

8 0

3 years ago

8.19 - Airline Reservations System (Project Name: Airline) - A small airline has just purchased a computer for its new automated

e-lub [12.9K]

Answer:

The App is written in C++ language using dev C++.

Explanation:

/******************************************************************************

You can run this program in any C++ compiler like dev C++ or any online C++ compiler

*******************************************************************************/

#include <iostream>

using namespace std;

class bookingSeat// class for airline reservation system

{

private:

bool reserveSeat[10];// 10 seats (1-5) for first class and 6-10 for economy class

int firstClassCounter=0;//count first class seat

int economyClassCounter=5;//count economy class seat

char seatPlacement;/* switch between economy and first clas seat----- a variable for making decision based on user input*/

public:

void setFirstClassSeat()//

{

if(firstClassCounter<5)// first class seat should be in range of 1 to 5

{

reserveSeat[firstClassCounter]=1; /*set first class seat..... change index value to 1 meaning that it now it is reserved*/

cout<<"Your First Class seat is booked and your seat no is "<<firstClassCounter+1; //display seat number reserved

firstClassCounter++; //increament counter

}

else//in case seats are ful

{

cout<<"\nSeats are full";

if(economyClassCounter==10 && firstClassCounter==5)

{

cout<<"\n Next flight leaves in 3 hours.";

}

else

{

cout<<"\nIt’s acceptable to be placed to you in the first-class section y/n ";//take input from user

cin>>seatPlacement;//user input

if(seatPlacement=='y')//if customer want to reserve seat in first class

{

setEconomyClassSeat();// then reserve first class seat

}

else

{

cout<<"\n Next flight leaves in 3 hours.";

}

void setEconomyClassSeat()//set economy class seat

{

if(economyClassCounter<10)//seat ranges between 6 and 10

{

reserveSeat[economyClassCounter]=1;// reserve economy class seat

cout<<"Your Economy class seat is booked and your seat no is "<<economyClassCounter+1;//display reservation message about seat

economyClassCounter++;//increament counter

}

else// if economy class seats are fulled

{

cout<<"\nSeats are full";

if(economyClassCounter==10 && firstClassCounter==5)//check if all seats are booked in both classes

{

cout<<"\n Next flight leaves in 3 hours.";

}

else

{

cout<<"\nIt’s acceptable to be placed to you in the first-class section y/n ";//take input from user

cin>>seatPlacement;//user input

if(seatPlacement=='y')//if customer want to reserve seat in first class

{

setFirstClassSeat();// then reserve first class seat

}

else

{

cout<<"\n Next flight leaves in 3 hours.";

}

};

int main()

{ int checkseat=10;// check seat

int classType;//class type economy or first class

bookingSeat bookseat;//object declaration of class bookingSeat

while(checkseat<=10)//run the application until seats are fulled in both classes

{

cout<<"\nEnter 1 for First Class and 2 for Economy Class ";

cin>>classType;//what user entered

switch (classType)//decide which seat class to be reserved

{

case 1://if user enter 1 then reserve first class seat

bookseat.setFirstClassSeat();

break;

case 2://if user enter 2 then reserve the economy class seat

bookseat.setEconomyClassSeat();

}

return 0;

}

8 0

3 years ago

[4 points] Does the green LED emit light when you connect the banana plug wires across it? What does that say about the threshol

castortr0y [4]

Yes, the green LED emits light when we connect the banana plug wires across it.

This indicates that the threshold voltage is lower for the green LED light than the blue.

Explanation:

A banana plug is named for its resemblance to the shape of a banana. They are wider in the middle of the plug, and narrower at the top and bottom. The banana plug can be easily plugged or unplugged into the ports of speaker or receiver.

LED lights emit photons when it is applied with electrical charge. LED lights are more efficient and last longer than incandescent light bulbs. Green light is commonly provides the calming effect. It is generally used in hyper-pigmentation treatment.

4 0

3 years ago