Carnot engine a has an efficiency of 0.57, and carnot engine b has an efficiency of 0.72. both engines utilize the same hot reservoir, which has a temperature of 615 k and delivers 1248 j of heat to each engine. find (a), (b) the magnitude of the work produced by engine a and b respectively and (c), (d) the temperatures of the cold reservoirs that they use.

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?