Ireally need with my force worksheet!meee!

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a.true or b.false