Elmer is standing on the edge of a 30.0 m high cliff. He throws a rock vertically with an initial velocity of 12.0 m/s? How high does the rock go?

Why does the input force have to be greater than the force needed to lift the bale?

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.

The mantle is made up of which structural zones?