6. In the systems listed below, identify where energy is transferred as heat (circle), work (box) and where changes in internal energy occur (underline). Is energy conserved in each case? a. The parts in a steam engine consist of a boiler, a firebox, a cylinder, a piston, and a flywheel. b. The drill bit of a power drill and a metal block into which a hole is being drilled 7. A compressor for ajackhammer expands the air in the hammer's cylinder at a constant pressure of 8.6x105 Pa. The increase in the cylinders volume is 4.05x10 '4 m3. During the process, 9.5 J of energy is transferred out of the cylinder as heat. What is the work being done by the air? 8. If a weather balloon in a flight gives up 15 J of energy as heat and the gas within it does 13 J of work on the outside air, by how much does its internal energy change? 9. After reading the Why It Matters feature about refrigerators, explain why opening the refrigerator door on a hot day does not cause your kitchen to become cooler. (Use the internet if you don't have access to your book.)