1. One mole ideal gas is changed from temperature T1 and molar volume V1 to T2 and V2. Write down the change in entropy.

(a).Suppose that the cylinder is sliding without rolling down the smooth inclined face of the wedge, and the wedge is free to move on a horizontal plane with friction. How far has the wedge moved by the time the cylinder has descended from a rest a vertical distance h?Ans：___(1)____