A1400 kg wrecking ball hangs from a 20-m-long cable. the ball is pulled back until the cable makes an angle of 23.0 ∘ with the vertical. part a by how much has the gravitational potential energy of the ball changed?

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 ∘ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30∘ from horizontal. what is the weight of the rider? express your answer with the appropriate units.

Asap and show ! a 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.