Help with something to do with angular stuff?

[paradoxical]

A copper block rests 39.0 cm from the center of a steel turntable. The coefficient of static friction between the block and the surface is 0.34. The turntable starts from rest and rotates with a constant angular acceleration of 0.50 rad/s2. After what time interval will the block start to slip on the turntable? (Hint: The normal force in this case equals the weight of the block.)


I seriously have no idea which formulas to use...Thanks!

Solved...thanks

 

[HallsofIvy]

Do you know how to calculate the centrifugal force on a rotating object?

 

[paradoxical]

Do you know how to calculate the centrifugal force on a rotating object?

I only know how to do centripetal forces...

Actually hold on...maybe

 

[paradoxical]

I have down the formula:

force that maintains circular motion=mrw^2

If there was a way to find angular displacement, that would be helpful.

 

[foxjwill]

Do you know how to calculate the centrifugal force on a rotating object?

If you're trying to confuse the poor lad, that's not very nice. Centrifugal force, as I'm sure you know, is a fictional force, which means, for the purposes of this thread, that it doesn't exist.

 

[foxjwill]

Try doing a force body diagram.

 

[paradoxical]

Ok...I'm trying to calculate what Fs is now...thanks!