Irving, a cat, has a favorite toy that is made up of a squeaky ball at the end of a string. the toy makes up a closed system. irving’s owner dangles the toy so that the ball swings down and then swings back up again.
ignoring any friction, how are kinetic and potential energy related to each other as the ball swings back and forth?

as the ball moves upward, both kinetic and potential energy decrease.
as the ball moves downward, both kinetic and potential energy increase.
as the ball moves upward, kinetic energy decreases and potential energy increases.
as the ball moves downward, kinetic energy decreases and potential energy increases.

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?

Which composition of water moves to begin a deepwater current?

Should we celebrate the voyages of zheng he mini q answer key