# Math Help - Linear Velocity

1. ## Linear Velocity

A pulley of radius 15 cm turns at 8 revolutions per second. What is the linear velocity of the belt driving the pulley in meters per second?

Here is the way I did this--am I correct?

v = 2pi r/T

v = 2pi (15)/8

v = 94.2/8

v = 11.8

2. incorrect ...

T is not 8 ... 8 revolutions per second means $T = \frac{1}{8}$ sec.

also, you need to pay attention to your units ... 15 cm = .15 m

3. ## Thanks to Skeeter

12/5/08

Hi Skeeter--

Thanks for your help on the linear velocity problem.

Joanie