Question

A solid disk of mass m_{1} = 9 kg and radius R = 0.23 m
is rotating with a constant angular velocity of ω = 39 rad/s. A
thin rectangular rod with mass m_{2} = 3.3 kg and length L
= 2R = 0.46 m begins at rest above the disk and is dropped on the
disk where it begins to spin with the disk.

6)

The rod took t = 5.4 s to accelerate to its final angular speed with the disk. What average torque was exerted on the rod by the disk?

Answer #1

A disk with mass m = 10.3 kg and radius R = 0.34 m begins at
rest and accelerates uniformly for t = 16.8 s, to a final angular
speed of ω = 26 rad/s.
1)
What is the angular acceleration of the disk?
rad/s2
2)
What is the angular displacement over the 16.8 s?
rad
3)
What is the moment of inertia of the disk?
kg-m2
4)
What is the change in rotational energy of the disk?
J
5)...

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(with a direction shown by the arrow).
1)
What is the magnitude of the angular momentum of the spinning
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kg-m2/s
2)
What is the torque due to gravity on the disk?
N-m
3)...

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disks are dropped so that they share a rotational axis, and they
stick together. The moment of inertia of a disk is 1/2mr^2. What is
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The figure shows a rigid assembly of a thin hoop (of mass m =
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A disk with mass m = 8.5 kg and radius R = 0.35 m begins at rest
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a) What is the angular acceleration of the disk?
b) What is the angular displacement over the 18.9 s?
c) What is the moment of inertia of the disk?
d) What is the change in rotational energy of the disk?
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A flat uniform circular disk (radius = 3.00 m, mass = 1.00 ✕ 102
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A ceiling fan consists of a small cylindrical disk with 5 thin
rods coming from the center. The disk has mass md = 3 kg
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1)
What is the moment of inertia of each rod about the axis of
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kg-m2
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What is the moment of inertia of the disk about the axis of
rotation?
kg-m2
3)
What...

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