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a heat pump operates between reservoirs at 300 k inside the house and 252 k outside it is not a reversible heat pump it
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vince is determined to test law of gravity for himself walks a skyscraper 900ft with zero initial velocityfive seconds
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a 220g ball is dropped from a height of 25m and bounces on a hard floor the force on the ball from the floor is shown
a as our bodies burn food as fuel we radiate energy assume a person has a body surface area of 180 m2 and an emissivity
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a keg of beer is covered with a wet towel imagine that the keg gains energy from its surroundings at a rate of 20 wpart