If a truck is moving in a straight line and has a frictional force of 7N acting against it, what is the magnitude of the force necessary to keep the truck moving with no
acceleration?

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

Choose all the answers that apply. our solar system: is in a spiral galaxy no longer includes pluto is made mostly of empty space is in the andromeda galaxy is the only known system that supports life

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?