A 40-kg cannonball resting atop the crows nest of a pirate ship has 14,000 J of PE. How tall is the crows nest?

A50.0-n box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. you observe that at one instant the box is sliding to the right at and that it stops in 2.25 s with uniform acceleration. what magnitude force does friction exert on this box

A-4.60 μc charge is moving at a constant speed of 6.80×105 m/s in the +x−direction relative to a reference frame. at the instant when the point charge is at the origin, what is the magnetic-field vector it produces at the following points.

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic