Movement of a stationary object (2words)

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?

The ph is the a.independent variable b.the dependent variable c.control group

Which type of energy would have nothing to do with ironing clothes? a. heat b. chemical c. electrical d. mechanical