Assume that according to the official rules of an international sport, a ball acceptable for tournament play must bounce to a height of between 175 and 185 cm when dropped from a height of 254 cm at room temperature. what is the acceptable range of values for the coefficient of restitution for the ball-floor system?

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

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