Jim rides his skateboard down a ramp that is in the shape of a quarter circle with a radius of 5.00 m. at the bottom of the ramp, jim is moving at 9.00 m/s. jim and his skateboard have a mass of 58.4 kg. how much work is done by friction as the skateboard goes down the ramp?

Wfr=-496.4 J

Explanation:

The total work of the motion is describe

x=5.0m

v=9.0 m/s

m=58.4kg

The Work of the friction can be find without know the coefficient however knowing the total work and the work done by the gravity down a ramp can find the work of the friction

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.