1. If an automobile had an engine that was 100% efficient, would it be warm to your touch? Would its exhaust heat the surrounding air? Would it make any noise? Would it vibrate? Would any of its fuel...

1. If an automobile had an engine that was 100% efficient, would it be warm to your touch? Would its exhaust heat the surrounding air? Would it make any noise? Would it vibrate? Would any of its fuel remain unused?

2. A fully dressed person is at rest in the middle of a pond on perfectly frictionless ice and must reach the shore. Discuss how this can be done.