Problem finding angular velocity

  • #1
[SOLVED] Problem finding angular velocity... !!

Homework Statement




The 9.65 lb uniform disk is pin supported at its center and is acted upon by a constant force of P = 1.45 lb as shown. The system starts from rest. Radius of disk is .470 ft

The force P is going straight down from the disk and would spin the disk in a clockwise direction. The force P is at the end of a string.. making the disk spin.

Determine the angular velocity after 4.45 seconds. (rad/s, +CCW)

Homework Equations



I know this problem involves a constant accel equation. I believe the right one is angvelfinal = angvelinitial + a*t



The Attempt at a Solution



The issue i have is that i can't figure out how to relate the force acting on the disk to turn it into acceleration. I have tried setting "Force*Radius=(.5*Mass*radius^2)angaccel" and solving for angaccel and then multiplying it by the time in order to get my angvel but i am having no luck. Any help i appreciated.
 

Answers and Replies

  • #2
any other info i need to give guys?? i have been on this question for two days lol. I can finish it i just can't figure out how i get from a force in lbs pulling down on a string turning a disc... to the acceleration of the disc. Ive looked through formulas and have had no luck anywhere.
 
  • #3
thanks guys, i figured it out. I was doing it right but somehow my numbers were off somewhere.
 

Related Threads on Problem finding angular velocity

Replies
2
Views
4K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
1
Views
32K
  • Last Post
Replies
3
Views
10K
  • Last Post
Replies
3
Views
5K
Replies
6
Views
7K
Top