Question

The angular speed of a fly wheel making 120 revolutions/minute is

Answer 1

Answer:

Given:

Angular velocity of a flying wheel expressed in revolution per minute

= 120 rpm.

Full form of rpm => revolution per minute

To find:

Angular velocity expressed in SI unit

(i.e. radian /sec)

Conversion:

We have to convert "rpm" to "radian/sec"

The following concept can be used.

The wheel undergoes 360° or 2π rotation in full completion of rotational motion.

The "time" also has to changed from minutes to seconds.

So,

120 rpm = (120 × 2π)/60 = 4π rad/sec.

So the angular speed is 4π rad/sec.