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Q1. A space vehicle is travelling at 5800 km/h relative to the Earth when the exhausted rocket motor is disengaged and sent backward with a speed of 74km/h relative to the command module. The mass of the motor is four times the mass of the module. What is the speed of the command module relative to Earth just after the separation?

Q2. The rms speed of the molecules in 1.7 g of hydrogen gas is 1600 m/s.

A) What is the total translational kinetic energy of the gas molecules?

B) What is the thermal energy of the gas?

C) 300 J of work are done to compress the gas while, in the same process, 1900 J of heat energy are transferred from the gas to the environment. Afterward, what is the rms speed of the molecules?

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