What is the driving force behind the movement of Earth's plates? Convection currents in the mantle are slowly causing the plates to move.

The magnetic pull of the poles are pulling the plates apart.

The inertia of the rotation of the Earth causes the plates to move.

The aliens are playing with the Earth like a puzzle.

What is the coefficient of kinetic friction μk between the block and the tabletop?

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c

Atruck with 34-in.-diameter wheels is traveling at 55 mi/h. find the angular speed of the wheels in rad/min, *hint convert miles to inches & hours to minutes: