Please help I need this done

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?

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

Most short-period comets do not have randomly oriented orbits because