A 1400 kg car is traveling on a level road at a constant speed of 26.8 m/s (60 milesper hour.) The drag force exerted by air on the car and the frictional force exerted by theroad on the car’stires add to give a net force of 680N pointing opposite to the direction ofthe car’s motion. What is the rate of work done (power) by the air and the road on thecar?

An apple is falling from a tree. disregarding air resistance, which diagram shows the free-body diagram of the force or forces acting on the apple?

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?

The slope of a velocity time graph over any interval of time gives the during that interval