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Chapter 21 Kinetic Theory of Gases (Lecture Examples) Example 1: During a storm 500 hailstones strike a 2 m2 window in one minute. If the collisions are elastic and the hail strikes at a 45° angle what is the pressure exerted on the window? The average hailstone has a mass of 30 grams and a speed of 40 m/s. Example 2: Find the rms speed of a hydrogen nucleus at a temperature of 20 million °C. Example 3: Calculate the change in heat when the temperature of 3 moles of monatomic gas is doubled at constant volume. The gas is initially at STP. Example 4: Calculate the change in heat when the temperature of 3 moles of monatomic gas is doubled at a constant pressure. The gas is initially at STP. Example 5: 2 moles of a monatomic gas initially at 20 °C and one atmosphere expand adiabatically to 4 times their initial volume. Find the final volume, temperature and pressure. Example 6: Calculate the work done by a gas during an adiabatic change.