gravity =9.8m/s

The ratio of radii of Earth to another planet is 2/3 and the ratio of their * 2 points mean densities is 4/5. If an astronaut can jump to a maximum height of 1.5 m on the Earth, with the same effort, the maximum height he can jump on the planet is: O 0.8 m O 1.6 m 2.4m 4.5 m 1 point The force of gravitation between two bodies in the universe does not depend on: the distance between them O the sum of their masses the product of their masses the gravitational constant According to the second law of thermodynamics: * 1 point all heat engines have the same efficiency O all reversible heat engines have the same efficiency the efficiency of any heat engine is independent of its working substance O the efficiency of a Carnot engine depends only on the temperatures of the two reservoirs