Question

A gas is compressed at a constant pressure of $50 \mathrm {~N} / \mathrm { m } ^ { 2 }$ from a volume of $10 m ^ { 3 }$ to a volume of $4 m ^ { 3 }$. Energy of 100 J then added to the gas by heating. Its internal energy is

• A. Increased by 400 J
• B. Increased by 200 J
• C. Increased by 100 J
• D. Decreased by 200 J

Answer 1

Answer: (A)

Increased by 400 J

Answer 2

From FLOT

$\Delta Q = \Delta U + \Delta W$ $= \Delta U + P \Delta V$