Momentum A ball weighing .05 kg strikes a 1000 kg stationary wall at 30
m/s. According to Newton's Third Law, which of these must
be true?
Select one:
The total momentum of the system after impact is 30000 kg • m/s
The total momentum of the system before impact was 15 kg. m/s
The wall moves away from the ball at 30 m/s.
The total momentum of the system before impact was 1.5 kg . m/s

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?

You can watch static electricity in action by rubbing an inflated balloon against your hair. your hair will actually stand on its end! it does this because each hair becomes charged, and they all repel one another.

The statue of liberty is 305.5 feet high. when the angle of elevation of the sun is 50 , what is the distance to the tip of the shadow from a point at water level and directly below the highest point of the statue?