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Tema [17]
4 years ago
13

A piston-cylinder device initially at 0.4-m3 contains nitrogen gas at 600 kPa and 300 K. Now the gas is compressed isothermally

to a volume of 0.2 m3. The work done on the gas during this compression process is _____ kJ.
Engineering
1 answer:
madreJ [45]4 years ago
5 0

Answer:

W = 166.35 KJ

Explanation:

P₁ = 600 KPa

V₁ = 0.4 m³

V₂ = 0.2 m³

T = 300 K

W = ?

We can find the solution from the standard relation for work in an isothermal process

W = -n*R*T*Ln (Vf / Vi)

We know that

n*R*T = P*V  ⇒    P₁*V₁ = P₂*V₂ = n*R*T = 600 *0.4 = 240

Now, we use the equation

W = -n*R*T*Ln (Vf / Vi) = - P₁*V₁*Ln (Vf / Vi)

⇒   W = -240*Ln (0.2 / 0.4) = 166.35 KJ

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Answer: Feed him, give him meds

Explanation:

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3 years ago
This problem demonstrates aliasing. Generate a 512-point waveform consisting of 2 sinusoids at 200 and 400-Hz. Assume a sampling
aalyn [17]

Answer and Explanation:

clear all; close all;  

N=512;  

t=(1:N)/N;

fs=1000;  

f=(1:N)*fs/N;

x= sin(2*pi*200*t) + sin(2*pi*400*t);  

y= sin(2*pi*200*t) + sin(2*pi*900*t);

for n = 1:20  

a(n) = (2/N)*sum(x.*(cos(2*pi*n*t)))

b(n) = (2/N)*sum(x.*(sin(2*pi*n*t)))  

c(n) = sqrt(a(n).^2+b(n).^2)  

theta(n) =-(360/(2*pi))*atan(b(n)./a(n));  

end  

plot(f(1:20),c(1:20),'rd');

disp([a(1:4),b(1:4),c(1:4),theta(1:4)])

8 0
3 years ago
Harmony in music is characterized by _____.
stira [4]

Answer:

the vertical relationship of pitches.

Explanation:

Harmony can be defined as the use of simultaneous pitches ( two or more tones and notes) or chords played at the same time together.

Harmony in music is characterized by the vertical relationship of pitches. The three most popular and essential forms of harmony are;

1. Diatonic harmony.

2. Non-diatonic harmony.

3. Atonal harmony.

6 0
3 years ago
Read 2 more answers
Identify renewable energy sources you will propose. Explain the key elements to your solution and the basic technical principles
MArishka [77]

Answer:

A renewable electricity generation technology harnesses a naturally existing energy. But they have other features that a few fringe customers value.

Explanation:

3 0
3 years ago
A water tank is completely filled with liquid waterat 20°C.The tank material is such that it can withstand tensioncaused by a vo
Xelga [282]

Answer:

Highest temperature rise allowable = ΔT = 21.22°C

Highest allowable temperature = ΔT + 20 = 41.22°C

Explanation:

From literature, the coefficient of volume expansion of water between 20°C and 50°C = β = (0.377 × 10⁻³) K⁻¹

Volume expansivity is given by

ΔV = V β ΔT

ΔV = Change in volume

V = initial volume

β = Coefficient of volume expansion = (0.377 × 10⁻³) K⁻¹ = 0.000377 K⁻¹

ΔT = Change in temperature = ?

It is given in the question that maximum volume increase the tank can withstand is

(ΔV/V) × 100% = 0.8%

(ΔV/V) = 0.008

V β ΔT = ΔV

β ΔT = (ΔV/V)

β ΔT = 0.008

ΔT = (0.008/β)

ΔT = (0.008/0.000377)

ΔT = 21.22°C

Highest temperature rise allowable = ΔT = 21.22°C

Highest allowable temperature = ΔT + 20 = 41.22°C

Hope this Helps

5 0
4 years ago
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