7. A rifle with a weight of 30 N fires a 5.0-g bullet with a speed of 300 m/s. (a) Find the recoil speed of the rifle.
(b) If a 700-N man holds the rifle firmly against his
shoulder, find the recoil speed of man and rifle.

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.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.