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ANSWER KEY Blackline Master #1: Pre-Test 1.T 2.T 3.F 4.T 5.F 6.F 7.T 8.T 9.T 10.F Blackline Masters #3-8 .
Note that some of these questions have more than one possible answer.
1. The input energy is the chemical potential energy of fuel or electrical energy to drive the lift motor.
The waste energy is the sound energy and thermal energy of the air, chair lift motor, cables, connectors, etc.
The useful output energy is the kinetic energy and gravitational potential energy of skier and chair mov- ing to the top of the mountain.
2. The input energy is the chemical potential energy of the wood or other fuel.
The waste energy is the thermal energy of the air, light energy, incompletely burned fuel, thermal en- ergy of the pot.
The useful output energy is the thermal energy of the water.
3. The efficiency is 0.79%.
= 3.3 103 J = 3.3 kJ = 0.54 MJ = 5.4 105 J