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 solid disk of mass m1 = 9.5 kg and radius R = 0.19
m is rotating with a constant angular velocity of ω = 30 rad/s. A
thin rectangular rod with mass m2 = 3.3 kg and length L
= 2R = 0.38 m begins at rest above the disk and is dropped on the
disk where it begins to spin with the disk.
5) What is the final rotational energy of the rod and disk
system?

A solid disk of mass m1 = 9.5 kg and radius R = 0.19
m is rotating with a constant angular velocity of ω = 30 rad/s. A
thin rectangular rod with mass m2 = 3.3 kg and length L
= 2R = 0.38 m begins at rest above the disk and is dropped on the
disk where it begins to spin with the disk.
1) What is the initial angular momentum of the rod and disk
system?
2) What...

A solid disk of mass m1 = 9.8 kg and radius R = 0.25 m is
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rectangular rod with mass m2 = 3.9 kg and length L = 2R = 0.5 m
begins at rest above the disk and is dropped on the disk where it
begins to spin with the disk.
1)What is the initial angular momentum of the rod and disk
system?
2)What is the...

A solid disk of mass m1 = 9.3 kg and radius R = 0.21
m is rotating with a constant angular velocity of ω = 30 rad/s. A
thin rectangular rod with mass m2 = 3.8 kg and length L
= 2R = 0.42 m begins at rest above the disk and is dropped on the
disk where it begins to spin with the disk.
1)
What is the initial angular momentum of the rod and disk
system?
2)
What...

A disk with mass m = 10.3 kg and radius R = 0.34 m begins at
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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)...

1) A torque of 1.20 N m is applied to a thin rod of mass 2.50 kg
and length 50.0 cm pivoted about its center and at rest. How fast
is the rod spinning after 4.25 s?
a. 32.6 rad/s
b. 8.16 rad/s
c. 97.9 rad/s
d. 24.5 rad/s
2) A torque of 1.20 N m is applied to a thin rod of mass 2.50 kg
and length 50.0 cm pivoted about one end and at rest. How fast is...

A disk with mass m = 6.3 kg and radius R = 0.46 m hangs from a
rope attached to the ceiling. The disk spins on its axis at a
distance r = 1.53 m from the rope and at a frequency f = 19.7 rev/s
(with a direction shown by the arrow).
1)
What is the magnitude of the angular momentum of the spinning
disk?
kg-m2/s
2)
What is the torque due to gravity on the disk?
N-m
3)...

A disk (mass of 3 kg, radius 30 cm) is rotating with an angular
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is rotating at w= -7 rad/s is dropped on top of the first disk. The
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 =
0.23 kg and radius R = 0.16 m) and a thin radial rod (of length L =
2R and also of mass m = 0.23 kg). The assembly is upright, but we
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A uniform disk of mass Mdisk = 4 kg and radius R =
0.24 mhas a small block of mass mblock = 2.2 kg on its
rim. It rotates about an axis a distance d = 0.16 m from its center
intersecting the disk along the radius on which the block is
situated.
What is the moment of inertia of the block about the rotation
axis?
What is the moment of inertia of the disk about the rotation
axis?
When...

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