A devious child uses a spring inside a mechanical pencil to launch a small eraser into the air. The mass of the pencil is m and the spring constant of the spring is k. A. (100 points) By how much is the spring initially compressed if the eraser is moving at v immediately after the spring reaches its equilibrium length

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?