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3 years ago

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Air,in a piston cylinder assembly, is initially at 300 K and 200 kPa.It is then heated at constant pressure to 600 K. Determine

the change in internal energy of air per unit mass, using:
a) The ideal gas table for air.b) Show the process on a (p-v) diagram.

2 answers:

Mandarinka [93]3 years ago

5 0

Answer:

Explanation: Please see the attached picture for answer.

Dvinal [7]3 years ago

5 0

Answer:Check the attached

Explanation:

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According to the

zysi [14]

Answer:

The part of the system that is considered the resistance force is;

B

Explanation:

The simple machine is a system of pulley that has two pulleys

The effort, which is the input force at A gives the value of the tension at C and D which are used to lift the load B

Therefore, we have;

A = C = D

B = C + D = C + C = 2·C

∴ C = B/2

We have;

C = B/2 = A

Therefore, with the pulley only a force, A equivalent to half the weight, B, of the load is required to lift the load, B

The resistance force is the constant force in the system that that requires an input force to overcome in order for work to be done

It is the force acting to oppose the sum of the other forces system, such as a force acting in opposition to an input force

Therefore, the resistance force is the load force, B, for which the input force, A, is required in order for the load to be lifted.

3 0

3 years ago

What major advancement in machine tools occurred in the 1970s and what benefits did it provide? describe in your own words.

mixer [17]

Answer:

I'm just a seventh grader

4 0

3 years ago

Read 2 more answers

Using the data in the photo write the complex waveform expression

UNO [17]

Answer:

1st Harmonic:

$v(t) = 50\cos(2000\pi t)$

3rd Harmonic:

$v(t) = 9\cos(6000\pi t)$

5th Harmonic:

$v(t) = 6\cos(10000\pi t)$

7th Harmonic:

$v(t) = 2\cos(14000\pi t)$

Explanation:

The general form to represent a complex sinusoidal waveform is given by

$v(t) = A\cos(2\pi f t + \phi)$

Where A is the amplitude in volts of the sinusoidal waveform

Where f is the frequency in cycles per second (Hz) of the sinusoidal waveform

Where $\phi$ is the phase angle in radians of the sinusoidal waveform.

1st Harmonic:

We have A = 50, f = 1000 and φ = 0

$v(t) = 50\cos(2\pi 1000 t + 0) \\\\v(t) = 50\cos(2000\pi t)$

3rd Harmonic:

We have A = 9, f = 3000 and φ = 0

$v(t) = 9\cos(2\pi 3000 t + 0) \\\\v(t) = 9\cos(6000\pi t)$

5th Harmonic:

We have A = 6, f = 5000 and φ = 0

$v(t) = 6\cos(2\pi 5000 t + 0) \\\\v(t) = 6\cos(10000\pi t)$

7th Harmonic:

We have A = 2, f = 7000 and φ = 0

$v(t) = 2\cos(2\pi 7000 t + 0) \\\\v(t) = 2\cos(14000\pi t)$

Note: The even-numbered harmonics have 0 amplitude that is why they are not shown here.

8 0

4 years ago

Read 2 more answers

A system consists initially of nA moles of gas A at pressure p and temperature T and nB moles of gas B separate from gas A but a

Volgvan

Answer:

A) б = - R ( nA In Ya - nB In Yb )

B) s2 = ( nA + nB ) s( T,P )

C) No entropy will be produced

Explanation:

A) assuming ideal gas behavior the expression for entropy produced

for a closed system : s2 - s1 = б

where : s1 ( initial entropy ) = nA sA ( T, P ) + nB sB ( T, P )

s2 ( final entropy ) = nA sA ( T, YaP ) + nB sB ( T, YbP )

∴ б = - R ( nA In Ya - nB In Yb )

B) Given that

Ya and Yb are less than 1 respectively, hence the value of б = positive

also assuming the gases are identical

s2 = ( nA + nB ) s( T,P )

C) No entropy will be produced when same gas at same temperature and same pressure are mixed

5 0

3 years ago

transformer has 26 turns on the primary coil and 720 turns on the secondary coil. If this transformer is to produce an output of

hram777 [196]

<h2>Corrected Question:</h2>

A step-up transformer has 26 turns on the primary coil and 720 turns on the secondary coil. If this transformer is to produce an output of 4100 V with a 16-mA current, what input current and voltage are needed?

<h2>Answer:</h2>

The input current and voltage needed are 443 mA and 148 V respectively.

<h2>Explanation:</h2>

In a step-up transformer, the relationship between the number of turns in its primary coil ( $N_{p}$ ), the number of turns in its secondary coil ( $N_{s}$ ), the input voltage ( $V_{p}$ ), the output voltage ( $V_{s}$ ), the input current ( $I_{p}$ ), and the output current ( $I_{s}$ ) is given by;

$\frac{N_{s} }{N_{p} }$ = $\frac{V_{s} }{V_{p} }$ = $\frac{I_{p} }{I_{s} }$

This implies that;

$\frac{N_{s} }{N_{p} }$ = $\frac{V_{s} }{V_{p} }$ ---------------------(i)

$\frac{N_{s} }{N_{p} }$ = $\frac{I_{p} }{I_{s} }$ ---------------------(ii)

From the question;

$N_{p}$ = 26 turns

$N_{s}$ = 720 turns

$V_{s}$ = 4100V

$I_{s}$ = 16mA = 16 x 10⁻³A

(a) Substitute these values into equation (ii) as follows;

$\frac{720}{26}$ = $\frac{I_{p} }{16*10^{-3}}$

Solve for $I_{p}$ ;

$I_{p}$ = 720 x 16 x 10⁻³ / 26

$I_{p}$ = 443 x 10⁻³

$I_{p}$ = 443 mA

Therefore the input current needed is 443mA

(b) Also, substitute those values into equation (i) as follows;

$\frac{720}{26}$ = $\frac{4100 }{V_{p} }$

Solve for $V_{p}$ ;

$V_{p}$ = 4100 x 26 / 720

$V_{p}$ = 148 V

Therefore, the input current needed is 148 V

5 0

3 years ago