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Q1. How much work is done by the gas in the balloon all through this isothermal expansion? Overlook tension forces in the balloon.

Q2. A train is travelling up a 3.73^o incline at a speed of 3.25m/s, while the last car breaks free and begins to coast without friction.
(1) How long does it take for the last car to come to rest momentarily?
(2) How far did the last car travel before (momentarily) coming to rest?
(3) For a real train the friction between the car and the track can be described by a friction coefficient, μ. Find out this coefficient assuming that the time it takes for the car to come to rest is 3 s.

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