The dome of a Van de Graaff generator receives a charge of 5 x 10^-4 C. Find the strength of the electric field in the following situations. a. inside the dome in N/C.
b. at the surface of the dome, assuming it has a radius of 3.0 m in N/C.
c. 8.0 m from the center of thedome in N/C.

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm

Aball of mass 0.3kg is released from rest at a height of 8m.how fast is it going when it hits the ground? accleration due to gravity is g=9.8m/s