Solve the Problem
-A Pulley of Radius $11 \mathrm {~cm}$ Rotates 15 Times In

Solve the problem
-A pulley of radius $11 \mathrm {~cm}$ rotates 15 times in $4 \mathrm { sec }$ . Find the angular speed of the pulley.

A) $\frac { 165 \pi } { 4 }$ radians per sec
B) $\frac { 2 \pi } { 165 }$ radian per $\mathrm { sec }$
C) $\frac { 4 \pi } { 165 }$ radian per sec
D) $\frac { 15 \pi } { 2 }$ radians per sec