If the activity of the engine oil is 79 decays/s , how much mass was worn from the piston rings per hour of operation?

radiation warms things up temp rises convection currents air circ windy weather

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.