Question

Engineers are designing a system by which a falling mass m imparts kinetic energy to a rotating uniform drum to which it is attached by thin, very light wire wrapped around the rim of the drum (the figure (Figure 1) ). There is no appreciable friction in the axle of the drum, and everything starts from rest. This system is being tested on earth, but it is to be used on Mars, where the acceleration due to gravity is 3.71 m/s2. In the earth tests, when m is set to 15.0 kg and allowed to fall through 4.00 m , it gives 150.0 J of kinetic energy to the drum.

Part A If the system is operated on Mars, through what distance would the 15.0-kg mass have to fall to give the same amount of kinetic energy to the drum? h =   m   SubmitMy AnswersGive Up Incorrect; Try Again; 5 attempts remaining Part B How fast would the 15.0-kg mass be moving on Mars just as the drum gained 150.0 J of kinetic energy? v =   m/s   SubmitMy AnswersGive Up Incorrect; Try Again; 4 attempts remaining

Answer 1

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