Afan of 45 kg has an unbalance that creates a harmonic force. a spring-damper system is designed to minimize the force transmitted to the base of the fan. a damper is used with a damping ratio of ζ=0.2 (not c). a) calculate the required spring stiffness

A2-kg bowling ball is 2.5 meters off the ground on a post when it falls. just before it reaches the ground, it is traveling 7 m/s. assuming that there is no air resistance, which statement is true?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.