A 50.0-kg child is riding on the edge of a merry-go-round that has a mass of 200 kg, a 3.00-m radius, and is spinning at 30.0 rpm. Consider the merry-go-round to be a solid disk with a rotational inertia of 1/2 MR^2. If the child moves to the center of the merry-go-round, what is the new frequency in rpm

Aman does 500 j of work pushing a car a distance of 2 m. how much force does he apply? assume there is no friction. a. 250 n b. 1000 n c. 125 n d. 500 n

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One soccer player (a) is moving at 4 km/h when she kicks the ball while another soccer player (b) is moving at 8 km/h. what statement accurately compares their kinetic energy if they have the same mass? a) both soccer players have the same kinetic energy. b) player b has twice the kinetic energy of player a. c) player b has four times the kinetic energy of player a. d) their kinetic energy can't be compared without knowing their mass.