Aheat engine absorbs 2500 j of heat from a hot reservoir and expels 1000 j to a cold reservoir. when it is run in reverse, with the same reservoirs, the engine pumps 2500 j of heat to the hot reservoir, requiring 1500 j of work to do so. find the ratio of the work done by the heat engine to the work done by the pump. is the heat engine reversible?

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?