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Re: Physics Quiz 9
Assuming a solid sphere, I get a final velocity v2 = 5/7*v1
Using conservation of momentum:
m*v1*R = I*omega
omega = v2/R (ball rolling v2 = r*omega)
I = I_sphere + I_point mass = 2/5*m*R^2 + m*R^2 = 7/5*m*R^2 (parallel axis theorem)
m*v1*R = 7/5*m*R^2 * v2/R
m, R both cancel
v1 = 7/5*v2 --> v2 = 5/7*v1
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Last edited by seg9585 : 15-12-2013 at 16:29.
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15-12-2013, 16:24
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