3.5-m-diameter merry-go-round is rotating freely with an angular velocity of 0.78 rad/s . its total moment of inertia is 1710 kg⋅m2 . four people standing on the ground, each of mass 66 kg , suddenly step onto the edge of the merry-go-round.
a. what is the angular velocity of the merry-go-round now?
b. what if the people were on it initially and then jumped off in a radial direction (relative to the merry-go-round)?

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.

Which of these statements best explains how the hydrosphere interacts with the atmosphere to affect global climate? mountains block rain clouds and cause changes in global rainfall and evaporation. humans burn fossil fuels to produce greenhouse gases which cause global warming. humans cut down trees which affects the amount of oxygen in different parts of the globe. greenhouse gases, like carbon dioxide, dissolve in oceans and prevent global warming.