You have made someone very angry! After a brief struggle, three thugs manage to get you shackled to a heavy steel ball and throw you into the river. You sink to a depth of 8.2 m. Because of the hydrostatic pressure at that depth, your body is squished to 89 % of its original volume. The entire process of your being tossed into the river results in the release of 155 J of heat from your body. Fortunately, you manage to escape and swim to shore. Then you begin to wonder about the change in your internal energy as a result of the entire fiasco.

a) Determine the total pressure on your body, in pascals, when you were at the depth of8.2m. Take the atmospheric pressure to be 1.01 10⁵Pa.

b) You approximate your pre-dunking volume to be 0.09 m³. From that, from the pressure, and from the heat your body released during the process, find the change in internal energy of the system (you!), in joules.