A piston compresses 1 kg of air inside a cylinder as shown The r

A piston compresses 1 kg of air inside a cylinder as shown The r
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A piston compresses 1 kg of air inside a cylinder as shown

The rate at which the piston does work on the air is 3000 W. At the same time, heat is being lost through the walls of the cylinder at a rate of 847.5 W. After 10 seconds, the change in specific internal energy of the air is

A. 21525 J/kg

B. -21525 J/kg

C. 30000 J/kg

D. -8475 J/kg

Please scroll down to see the correct answer and solution guide.

Right Answer is: A

SOLUTION

δQ = δW + Δu

-847.5 = -3000 + Δu

Δu = 2152.5 W = 2152.5 J/s

After 10 sec, ΔU = ΔU × 10 = 21525 J

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