Question

A motor spins a disk (Idisk = 24.2 kg*m2) with a torque of 39 N*m, and a 18 N frictional force acts on the disk at a radius of 1.3 m. Attached to the disk at a radius of 1.8 m is a 10 kg mass. What is the magnitude of the angular acceleration in rad/s2 of the system?

Answer #1

Suppose you exert a force of 212 N tangential to a 0.215 m
radius 75.0 kg grindstone (a solid disk). (Give your answers to at
least 2 decimal places.)
(a)
What torque (in N · m) is exerted? (Enter the magnitude.)
N · m
(b)
What is the angular acceleration (in rad/s2) assuming
negligible opposing friction? (Enter the magnitude.)
rad/s2
(c)
What is the angular acceleration (in rad/s2) if there
is an opposing frictional force of 20.6 N exerted 1.75...

A uniform disk with mass m = 9.07 kg and radius R = 1.36 m lies
in the x-y plane and centered at the origin. Three forces act in
the +y-direction on the disk: 1) a force 313 N at the edge of the
disk on the +x-axis, 2) a force 313 N at the edge of the disk on
the –y-axis, and 3) a force 313 N acts at the edge of the disk at
an angle θ =...

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)...

question 25
A net torque of 7.2 Nm acts on a 3.9 kg disk turntable of radius
12.4 cm. This net torque causes the disk turntable to rotate about
its natural center axis of rotation. The magnitude of the angular
acceleration = _________rad/ s2. The moment of inertia
of the disk is given by 0.5MR2.

Radius of the middle disk of the 3-step
pulley r = _0.0166_ ( m
) You need this value to calculate the torque applied to
the combination of the connected disk and the ring using a string
with a mass hanging at the other end.
Angular acceleration data for the Aluminum disk and the black
ring combined.
Mass m of the brass discs and the plastic mass hanger combined (
kg )
m = 0.025 kg
m = 0.045 kg
m =...

Point Pis on the rim of a large
Spinning Disk of mass 10.0 kg and radius 2.58 m.
At time t=0.00 s the disk has an angular velocity of 4.00 rad/s and
rotates counterclockwise about its center O, and
Pis on the x-axis. A net applied CW torque of 20.0
m-N causes the wheel to undergo a uniform angular acceleration. The
magnitude of the total acceleration (m/s2) at point
Pwhen t = 15.0 s is? The angular velocity of the...

You are given the following data for a complex Ring/Disk/Shaft
system.
Torque (N-m))
Angular Acceleration (rad/s2)
0.0496
0.542
0.0716
0.737
0.0936
1
0.1155
1.24
0.1374
1.475
Plot Torque (along y-axis) vs. Angular acceleration (along
x-axis) on excel with the trend line. Copy and paste your graph
here. What does the slope correspond to? What is it?
Find %error between theoretical and experimental moments of
inertia. The theoretical moment of inertia is given to be 0.09
Kg-m2.

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 solid disk of mass m1 = 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 m2 = 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...

A solid cylindrical disk has a radius of 0.19 m. It is mounted
to an axle that is perpendicular to the circular end of the disk at
its center. When a 40-N force is applied tangentially to the disk,
perpendicular to the radius, the disk acquires an angular
acceleration of 110 rad/s2.
What is the mass of the disk? kg

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