Your physical education teacher throws you a tennis ball at a certain velocity, and you catch it. you are given the following choice, the teacher can throw you a medicine ball (which is more massive than the tennis ball) which option would you choose in order to make the easiest catch? a) same kinetic energy b) with the same velocity c) same momentum?

The roller coaster from problem #1 then tops a second hill at 15.0 m/s, how high is the second hill? 91.5 m 79.2 m 80.0 m 68.5 m

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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.