A 0.1 kg sample of a gas is introduced into the space A, which is a cylinder with a piston C. The cylinder is immersed in an air bath B. The walls of the cylinder conduct heat, but the walls of the bath are insulated. The bath contains 0.05 kg of air. At the start of the process the temperature in A and B is uniform. When a force of 540 kg is applied to D, the piston moves slowly downward a distance of 9 cm. At the end of the process and when the temperatures have again become uniform, the temperature in the air bath has risen by 5.6 °C. Find the change in the internal energy of sample A in Joules. The average heat capacity of air for this experiment is 0.24 kcal/kg.°C.