Unformatted text preview: N
F = Iα / R = (0.40 kg ⋅ m 2 )(14 rad/s)/(0.20m)
C) 19.0 N
G) 21.0 N
= 28.0 N
D) 35.0 N
H) 33.0 N
7. A solid disk with a mass of 0.50 kg is rotating on a frictionless
!0
surface with an angular speed of 15.0 rad/s. Another disk just above
the first with the same radius is dropped onto the lower disk. Kinetic
friction between the disks brings both disks to a common angular
speed of 3.00 rad/s. What is the mass of the top disk?
A) 0.50 kg
E) 2.50 kg
L0 = L, I 0ω 0 = Iω = ( I 0 + I top )ω
B) 1.00 kg
F) 3.00 kg
I top = I 0 (ω 0 − ω ) / ω = I 0 (15 − 3) / 3 = 4 I 0
C) 1.50 kg
G) 4.00 kg
D) 5.00 kg
H) 2.00 kg
M top = 4 M 0 = 2.00 kg
8. A board in equilibrium has a mass of 23.0 kg, length 25.0 m is
pivoted about one end. A rope tied...
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This document was uploaded on 03/03/2014 for the course PHY 231 at Michigan State University.
 Summer '08
 smith
 Physics, Acceleration

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