A phonograph turntable rotates at 50 rev/ min.
We need to find the angular speed of the phonograph in rad/s.
We know the following conversions :
1 revolution = 6.28 radian
1 minute = 60 seconds
50 X rev/min
= 50 X 6.28rad/60s
The angular speed of the phonograph is 5.28rad/s.