Answer to Question #58120 in Molecular Physics | Thermodynamics for Christbeauty

Question

18 An engine absorbs 2000J of heat from a hot reservoir and expels 750J to a cold reservoir during each operating cycle. How much work is done during the cycle?
1250J
750J
2000J
350J

19 An engine absorbs 2000J of heat from a hot reservoir and expels 750J to a cold reservoir during each operating cycle. What is the power output of the engine if each cycle lasts for 0.5 seconds?
750W
1750W
3000W
2500W

20 The first law of thermodynamics is a restatement of which of these laws?
conservation of charge
conservation of momentum
conservation of entropy
onservation of energy