A car (m = 1770 kg) is parked on a road that rises 18 above the horizontal. What are the magnitudes of (a) the normal force and (b) the static frictional force that the ground exerts on the tires? F (a) Number Units (b) Number i UnitsA worker stands still on a roof sloped at an angle of 21 above the horizontal. He is prevented from slipping by a static frictional force of 500 N. Find the mass of the worker. Number UnitsA toboggan slides down a hill and has a constant velocity. The angle of the hill is 7.80 with respect to the horizontal. What is the coefficient of kinetic friction between the surface of the hill and the toboggan? Number UnitsA 264-kg motorcycle is accelerating up along a ramp that is inclined 30.0 above the horizontal. The propulsion force pushing the motorcycle up the ramp is 3240 N, and air resistance produces a force of 230 N that opposes the motion. Find the magnitude of the motorcycle's acceleration. D >