4. Please answer according to the kinetic theory of gases and conservation of mo

Question

4. Please answer according to the kinetic theory of gases and conservation of momentum: i. What happens to gas molecules when the gas gets hotter? ii. How fast do hydrogen (~ 2 * proton mass) and helium molecules (~ 4 times proton mass) move when they are heated to 2000K? iii. If you designed a nuclear rocket for NASA that could heat anything to 2000K which gas would you use for your rocket propellant for maximum speed? iv. How fast would your 5000 Kg rocket be travelling after expending its 10,000 Kg of fuel? v. Would the rocket accelerate at a constant rate?

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Explanation / Answer

Hi)

If a gas is heated up, its particles move around more quickly. They hit the walls of their container harder and more often. This increases the pressure. Sometimes the pressure gets so great that the container bursts.

This is why balloons and tyyres burst if you blow them up too much. It's also why deodorant spray cans carry warning signs to tell you not to leave them in the sunshine. If they get too hot they explode.

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