Energy conversion from potential energy (the energy of position or composition) to kinetic energy (the energy of motion) is illustrated by the diagram of a roller coaster. When the coaster is in position A, the potential energy is _ and the kinetic energy is _. As the coaster moves to position B, the potential energy is _ and the kinetic energy is _ . As momentum carries the coaster into position C, the potential energy is _ and the kinetic energy is _ . Finally as the coaster reaches position D, the potential energy is _ and the kinetic energy is _.
the answer choices are: (and yes some are meant to be there twice)
at its highest value
at its lowest value
at its maximum value
at its lowest value
decreased to 1/4 of its maximum value
decreased to half the original value
increased to 3/4 of the original value
increased to half its maximum value
zero

Which of the following is not a characteristic of s waves? a. travel slower than p waves. b. cannot be detected in locations more than 105° from an earthquake’s epicenter. c. travel through solids and liquids. d. only affect coastal regions.

What is the coefficient of kinetic friction μk between the block and the tabletop?

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?