- #1
Saitama
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Homework Statement
A disk of mass M and radius R unwinds from a tape wrapped around it. The tape passes over a frictionless pulley, and a mass m is suspended from the other end. Assume that the disk drops vertically.
a. Relate the accelerations of m and the disk, a and A, respectively to the angular acceleration of disk.
b. Find a, A and ##\alpha##.
Homework Equations
The Attempt at a Solution
Applying Newton's second law on disk: ##Mg-T=MA## where T is the tension in tape.
For m: ##mg-T=ma##. I still need one more equation.
I am not sure but do I have to equate the acceleration along string? For instance, the point in contact with disk has acceleration ##A-\alpha R##. Does this mean, ##a=A-\alpha R##?
Any help is appreciated. Thanks!