Consider a football coach pacing back and forth along the sidelines. The diagram below shows several of the coach's positions at various times. At each marked position,
the coach makes a "U-turn" and moves in the opposite direction. In other words, the
coach moves from position A to B to C to D. What is the coach's resulting displacement
and distance traveled?
Displacement =
Distance traveled =

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?

In science and physics what is the standard unit of measure for speed?

How can you increase the strength of an electromagnet?