(Solved): Please answer both and all parts! Chapter 11 -Using Energy: Q1. A person walks 1km, turns around, ...

Chapter 11 -Using Energy: Q1. A person walks $1\mathrm{km}$, turns around, and runs back to where he started. Compare the energy used and the power during the two segments. (Clearly circle the correct answer. No explanation needed.) a. The energy used and the power are the same for both. b. The energy used while walking is greater, the power while running is greater. c. The energy used while running is greater, the power while running is greater. d. The energy used is the same for both segments, the power while running is greater. Q2. Efficiency: A device uses $500\mathrm{J}$ of chemical energy to generate $100\mathrm{J}$ of electric energy. a. What is the efficiency of this device? b. A second device is twice as efficient. How much electric energy can it generate from the same $500\mathrm{J}$ of chemical energy?