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AP® Physics C: Mechanics

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Moderate

Angular Momentum and Atwood machines

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For the Atwood machine depicted above, the mass of the pulley wheel is $50g$ , $r= 25 cm$, $R=50cm$, $m_1=125g$ and $m_2=150g$. The mass of the rope and frictional effects are negligible.

If the pulley wheel starts from rest, what is the angular momentum of the pulley wheel after 5.0s?

A

$2.14 kg\frac{m^2}{s}$

B

$-2.14 kg\frac{m^2}{s}$

C

$6.13 kg\frac{m^2}{s}$

D

$-6.13 kg\frac{m^2}{s}$

E

$8.20 kg\frac{m^2}{s}$