FA 5.1 - Jambalaya.

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Presentation transcript:

FA 5.1 - Jambalaya

1. If a heater is 78.0% efficient, how much fuel energy would it consume to provide 120. J of useful heat? How much useful heat could it produce from 360. J of fuel energy? (154 J, 281 J)

2. How much time does it take for a 450 2. How much time does it take for a 450. Watt heater to produce 4580 J of heat? What heat will it put out in 32.0 s? (10.2 s, 14,400 J)

3. What work will a 342 W motor do in 60.0 seconds? (20,520 J)

4. What work would you do dragging a 56. 5 kg box 12 4. What work would you do dragging a 56.5 kg box 12.0 m over a level floor (at a constant low speed) where the coefficient of dynamic friction is 0.215? (1430 J)

5. What is the minimum power rating a motor could have if it is to lift a 560. kg elevator 35.0 m in 78.0 seconds? (2460 W)