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Physics (Rotation)

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In Fig. 10-28, wheel A of radius rA is coupled by belt B to wheel C of radius rC. The angular speed of wheel A is increased from rest at a constant rate α. Find the time needed for wheel C to reach angular speed ω assuming the belt does not slip. (Hint: If the belt does not slip, the linear speeds at the two rims must be equal.) State your answer in terms of the given variables.

FIGURE: imgur . com/QxZR5. gif
(remove spaces and paste)

I tried:



but said it was wrong.

  • Physics (Rotation) -

    ((Rc)/(ra) * omega)/alpha

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