# Finding Angular Velocity in Rotational Motion Problems

Homework Statement:
A ball, 1.8 kg, is attached to the end of a rope and spun in a horizontal circle above a student's head. As the student rotates the ball in a horizontal clockwise circle their lab partner counts 53 rotations in one minute. What is the ball's angular velocity in radians per second?
Relevant Equations:
1 rad/sec = 60/2pi rmp
53 rpm equals 5.55 rad/sec
multiply 5.55 by 2pi to get angular velocity of 34.8717

Is the answer 34.8717?

What should I have done to more accurately solve the problem with a better understanding?

What other steps should I take when solving similar problems?

and lastly,
Is the mass relevant to the problem in any way?

## Answers and Replies

haruspex
Science Advisor
Homework Helper
Gold Member
2020 Award
53 rpm equals 5.55 rad/sec
Right. Why continue past that? You are asked for it in units of rad/sec.

haruspex
Science Advisor
Homework Helper
Gold Member
2020 Award
Is the mass relevant to the problem in any way?
No.

• momoneedsphysicshelp
Right. Why continue past that? You are asked for it in units of rad/sec.
So this is only a conversion problem?
Thanks you very much.

When I turned in that answer, it was still wrong.

hmmm27
Gold Member
What answer ?