Question

How far does the ball slide before it starts to slip? MC problem.

Answer 1

I'm lost though I did some work earlier.

Answer 2

Okay, so I got 81/512 but that isn't an option

Answer 3

I did alpha = torque / I
wdisk=wcylinder
w0 - I (ugt/R) = 9/7 (ugt/R)
t= 9/16 r wo/ug
delta s = .5at^2
solved out using calculated t and a = ug
got 81/512 R^2 wo^2 / ug

Answer 4

And given w = v/r, I subbed in w^2 = v^2/r^2 which cancels out the R^2 to get
81/512 vo^2 / ug

Answer 5

Hi @wach !
Did you get the answer to your problem or do you still want one? Let me know.

Answer 6

Correct answer in No7: 175/512 vo²/µg