a point charge q1 = 5µc is at p1(3,1,2) . a second point charge q2 = -2µc is at p2(2,1,-1) . what is the a) potential v and b) the vector electric field e at p3(1,-1,1) ?

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?