• Support PF! Buy your school textbooks, materials and every day products Here!

Angular velocity and time

  • Thread starter dana711
  • Start date
2
0
1. Homework Statement
A spool of thin wire rotates without friction about its axis. A man pulls down on the wire with force of 14.9N. How long does it take to increase the angular velocity of the spool from 11.0rad/s to 35.0rad/s?
Icm = 0.490kg*m^2
Inner radius, r = 0.280m
Outer radius, R = 0.600m

2. Homework Equations
w=d(theta)/dt
w=v/r


3. The Attempt at a Solution

im not sure how to do this. i know the equation for angular velocity but i dont know what to do with the force and time
 

Answers and Replies

Doc Al
Mentor
44,827
1,083
Figure out the angular acceleration using Newton's 2nd law for rotation.
 

Related Threads for: Angular velocity and time

Replies
6
Views
510
Replies
0
Views
2K
Replies
2
Views
8K
Replies
3
Views
681
  • Last Post
Replies
1
Views
6K
Replies
1
Views
4K
Replies
2
Views
4K
Top