The pressure of a gas changes linearly with volume from 10 kPa, 200 cc to 50 kPa, 50 cc.
(a) Calculate the work done by the gas.
(b) If no heat is supplied or extracted from the gas, what is the changes in the internal energy of the gas?

Explanation

To solve the problem step by step, we will first calculate the work done by the gas and then determine the change in internal energy.

### Step-by-Step Solution

**(a) Calculate the work done by the gas.**

1. **Identify the pressure and volume points:**
- Initial pressure (P1) = 10 kPa at volume (V1) = 200 cc
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