4. A helicopter is flying at a height of 1.5km. If it has 50MJ of G. P.E., what is the mass of the
helicopter?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Brutus, the dog, is pulling a bone to the left with a force of 20 n. lassie, another dog, is pulling a bone to the right with a force of 18n. what is the net force? a. b. c.

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.