A cubical box containing 2 mole of He gas moves with constant speed u on a smooth horizontal surface. If the box suddenly stops, then determine the change in temperature of the gas by assuming mass of box to be negligible.

Explanation

To determine the change in temperature of the helium gas when the cubical box suddenly stops, we can follow these steps:

### Step 1: Understand the Energy Conservation Principle
When the box stops, the kinetic energy of the box and the gas inside it is converted into internal energy of the gas, resulting in an increase in temperature. According to the principle of conservation of energy:
\[ \Delta U = -\Delta K \]
where \(\Delta U\) is the change in internal energy and \(\Delta K\) is the change in kinetic energy.
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