When does a roller coaster have the most kinetic energy

What is the basic premise of the universal gravitational law?

Is the electric field contributed by the polarization charges on the surface of the metal sphere?

If you are sitting in your seat how are the forces acting on you?

A neutral balloon is rubbed with a piece of wool cloth. As a result, the balloon has a negative static charge. Which of the following statements best explains why the balloon has a negative charge? A. The balloon is a conductor. B.

A ladder is at rest with Oct upper end against a wall and its lower end on the ground. A worker is about to climb it. When is it more likly to slip

Show that the Newton has the units of mass times acceleration.

Light travels at 150000000km from the sun to earth in 8 minutes. What speed is this in Km/s

Electricity problem (coulomb's law)

An observer (O) spots a plane (P) taking off from a local airport and flying at a 29° angle horizontal to her line of sight and located directly above a tower (T). The observer also notices a bird (B) circling directly above her.

In order for convection to occur, you must have