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Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane

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?

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value