Problem 1 (10 points) An elastic balloon filled with hydrogen gas has a diameter of 0.3 m and an
internal pressure of 150 kPa. The gas is then heated as shown in Fig. 1 to a diameter of 0.4 m and
a pressure of 200 kPa. During the process, the pressure is proportional to the balloon's diameter.
Calculate (a) the work done by the gas during the process, (b) the work done by the balloon on the
atmosphere. Assume atmospheric pressure to be 100 kPa.
Taih
Initially
Finally
2000 P
230kPa