Homework Help Forum: Physics

Posted by Tommy on Thursday, November 5, 2009 at 7:36pm.

Sorry new here trying to figure out angular problem with a disc, only have 2 attempts remaining please help me out :D. When the play button is pressed, a CD accelerates uniformly from rest to 470rev/min in 3.0 revolutions. If the CD has a radius of 6.0 cm and a mass of 15 g , what is the torque exerted on it?

• Physics - bobpursley, Thursday, November 5, 2009 at 7:44pm

  a Disk? I= 1/2 mr^2 Torque= I*alpha but alpha= (wf-wi)/time and time is angular displacement/velocityavg time= 2PI*3/(1/2 479*2PI/60) then alpha= 470*2PI/60 / time do that, then calculate torque= 1/2 mr^2 * alpha keep units in mks.

  
  

• Physics - Tommy, Thursday, November 5, 2009 at 7:47pm

  First person who ever explained something to me that detailed thank you!

  
  

Answer this Question

First Name:
School Subject:
Answer:

For Further Reading