A boat takes off from the dock at 2.5 m/s

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

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 is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?