What happens when a roller coaster car moves down from the top of a hill? a. potential energy is transformed into electrical energy. b. potential energy is transformed into only kinetic energy. c. kinetic energy is transformed into electrical energy. d. kinetic energy is transformed into potential and thermal energy. e. potential energy is transformed into kinetic and thermal energy.

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Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.