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Q. A bicyclist of mass 66 (including the bicycle) can coast down a 5.0 hill at a steady speed of because of air resistance. How much force must be applied to climb the hill at the same speed and same air resistance?

Q. A block of copper of mass mCu whose temperature is TCu is placed in an insulating box with a block of lead of mass mPb and temperature TPb. (a) What is the equilibrium temperature of the two-block system? (b) What is the change in the internal energy of the system between its initial and equilibrium state? (c) What is the change in entropy for the system?

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