Unformatted text preview: gh its center. The mass of the sphere is 3.8 kg. Assuming a constant net torque is
applied to the sphere, how much work is required to bring the sphere to a stop?
Note: moment of inertia of a hollow sphere, I S = 2 MR 2 .
3
A) 1.02 J
E) 16.3 J
W = ΔK = 1 Iω 2 = 1 MR 2ω 2
B) 3.83 J
F) 19.9 J
2
3
C) 2.72 J
G) 13.4 J
1
= 3 (3.8 kg)(0.25 m)2 (13.0 rad/s)2 = 13.4 J
D) 25.5 J
H) 8.54 J 1 Form D Exam 3 PHY231 Spring 2013 Section 2 6. A string is wrapped around a pulley of radius 0.20 m and moment of inertia 0.40 kg ⋅
m2. The string is pulled generating an angular acceleration of 14.0 rad/s2. With what
magnitude of force was the string pulled?
τ = Iα τ = FR
A) 14.0 N
E) 22.0 N
B) 17.0 N
F) 28.0...
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 Summer '08
 smith
 Physics, Acceleration, Force, Mass, Rotation, pistons

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