The ball slips out of inertia on an ideally level ice. Is work being done in this case? explain.

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

When you turn on a battery-operated device, an electrical circuit is

In a system, when potential energy decreases, then entropy also decreases. true false