Apunter drops a 2.0 kg ball from rest vertically 1 meter down onto his foot. the ball leaves the foot with a speed of 18 m/s at an angle 55º above the horizontal. what is the impulse delivered by the foot (magnitude and direction)? ans: 43.6 kg*m/s @ 61.7° above the horizontal

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.