Earth's radius is approximately 6,400,000 meters. A point on Earth's equator makes one complete revolution in 24 hours. For that point on the equator, what is the (a.) angular speed (omega) in radians per second, and (b.) linear speed (v ) in meters per second? Show all your steps.

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?

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration