If velocity is measured in kilometers per hour and time in measured in hours, the unit of acceleration is a. hours
b. kilometers per hour
c. kilometers per hour per hour
d. kilometers

The charge on a charged sphere is: a)concentrated at its centerb)distributed uniformly throughout its volumec)clustered on its centerd)distributed uniformly over its surface

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

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?