Bob can throw a 500 g rock with a speed of 30 doing so (a) how much work does bob do on the rock (b) how much force, assumed to be constant, does (c) what is bob's maximum power output as he thrthe rock? ower output as he throws the rock? of the steel plate in the figure below for rotation about a steel plat ch12 calculate the moment of inertia perpendicular axis passing through the origin

Which statement is true? a) the work done to lift an object 6 meters is greater than the gravitational potential energy it gains. b) the work required to push an object is less than the work required to pull an object the same distance. c) the work required to raise an object to a height is equal to the gravitational potential energy the object gains. d) the work done against gravity to lift an object straight up is greater than the work required to roll it up a ramp.