Use the Formula V $v = r \omega$ To Find the Value of the Missing Variable

Multiple Choice

Use the formula v $v = r \omega$ to find the value of the missing variable. Give an exact answer unless otherwise indicated.
- $\mathrm { r } = 4 \mathrm {~cm} , \omega = \frac { \pi } { 3 }$ radian per sec

A) $\frac { 4 \pi } { 3 } \mathrm {~cm}$ per $\mathrm { sec }$
B) $\frac { \pi } { 12 } \mathrm {~cm}$ per sec
C) $12 \pi \mathrm { cm }$ per sec
D) $\frac { 3 \pi } { 4 } \mathrm {~cm}$ per sec