a student removes a 10.5kg stereo from a shelf that is 18.2 m high. the amplifier is lowered at a constant speed to a height of 0.75 m. what is the work done by (a) the person and (b) the gravitational force that acts on the amplifier?

How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?

(01.02 mc) nicole pushes her bike up a hill. overhead, the sun exerts a gravitational force on earth. which statement is true about the bike and earth? they both experience contact forces. they both experience non-contact forces. the bike experiences a non-contact force and earth experiences a contact force. the bike experiences a contact force and earth experiences a non-contact force. they both experience non-contact forces.

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?