A penny is placed at the outer edge of a disk (radius = 0.122 m) that...
A penny is placed at the outer edge of a disk (radius = 0.122 m) that rotates about an axis perpendicular to the plane of the disk at its center. The period of the rotation is 1.54 s. Find the minimum coefficient of friction necessary to allow the penny to rotate along the disk. (Answer in units)
Homework Answers
Coefficient of friction is
unitless quantity.Add Answer to:
A penny is placed at the outer edge of a disk (radius = 0.122 m)
that...
A penny is placed at the outer edge of a disk (radius = 0.138 m) that...
A penny is placed at the outer edge of a disk (radius = 0.138 m) that rotates about an axis perpendicular to the plane of the disk at its center. The period of the rotation is 1.71 s. Find the minimum coefficient of friction necessary to allow the penny to rotate along with the disk.
A penny is placed at the outer edge of a disk (radius = 0.147 m) that rotates about an axis perpendicular to the plane o...
A penny is placed at the outer edge of a disk (radius = 0.147 m) that rotates about an axis perpendicular to the plane of the disk at its center. The period of the rotation is 1.70 s. Find the minimum coefficient of friction necessary to allow the penny to rotate along with the disk.
A disk with a rotational inertia of 5.0 kg · m2 and a radius of 0.25...
A disk with a rotational inertia of 5.0 kg · m2 and a radius of 0.25 m rotates on a frictionless fixed axis perpendicular to the disk and through its center. A force of 8.0 N is applied along the rotation axis. The angular acceleration of the disk is? The answer is 0, but how?
A uniform solid disk of mass m = 3.06 kg and radius r = 0.200 m...
A uniform solid disk of mass m = 3.06 kg and radius r = 0.200 m rotates about a fixed axis perpendicular to its face with angular frequency 6.09 rad/s. (a) Calculate the magnitude of the angular momentum of the disk when the axis of rotation passes through its center of mass. kg · m2/s (b) What is the magnitude of the angular momentum when the axis of rotation passes through a point midway between the center and the rim?...
A uniform solid disk of mass m = 3.08 kg and radius r = 0.200 m...
A uniform solid disk of mass m = 3.08 kg and radius r = 0.200 m rotates about a fixed axis perpendicular to its face with angular frequency 6.09 rad/s. (a) Calculate the magnitude of the angular momentum of the disk when the axis of rotation passes through its center of mass. kg · m2/s (b) What is the magnitude of the angular momentum when the axis of rotation passes through a point midway between the center and the rim?...
A uniform solid disk of mass m = 2.99 kg and radius r = 0.200 m...
A uniform solid disk of mass m = 2.99 kg and radius r = 0.200 m rotates about a fixed axis perpendicular to its face with angular frequency 5.96 rad/s. (a) Calculate the magnitude of the angular momentum of the disk when the axis of rotation passes through its center of mass. kg · m2/s (b) What is the magnitude of the angular momentum when the axis of rotation passes through a point midway between the center and the rim?...
1 out of A wheel has an inner radius Ry = 0.5 m and an outer...
1 out of A wheel has an inner radius Ry = 0.5 m and an outer radius R2 = 1 m. The wheel is able to rotate around an axis that passes through its center and perpendicular to its plane. Two forces F = 20 N and F2 = 8 N act on the wheel as shown in the figure below. The magnitude of the net torque (in N.m) acting on the wheel about the rotation axis is: →F2 a)...
Imagine a spinning disk of uniform density, with mass M and radius R. Except where noted,...
Imagine a spinning disk of uniform density, with mass M and radius R. Except where noted, it is rotating about an axis through its center and perpendicular to its plane. What is its moment of inertia if the axis of rotation is moved to a line 2R from the center of the disk? (There’s no rotation of the axis, it remains parallel to its original position). Could someone explain what this question is asking in a diagram?
A disk with a diameter of 0.06 m is spinning with a constant velocity about an...
A disk with a diameter of 0.06 m is spinning with a constant velocity about an axle perpendicular to the disk and running through its center. 1) How many revolutions per second would it have to rotate in order for the acceleration of the outer edge of the disk to be 12 g's (i.e., 12 times the gravitational acceleration g)? f = 2) For the frequency determined in part (a), what is the speed of a point half way between...
1a. A cockroach of mass m lies on the rim of a uniform disk of mass...
1a. A cockroach of mass m lies on the rim of a uniform
disk of mass 9.00 m that can rotate freely about its
center like a merry-go-round. Initially the cockroach and disk
rotate together with an angular velocity of 0.456 rad/s. Then the
cockroach walks halfway to the center of the disk.
(a) What then is the angular velocity of the
cockroach-disk system?
(b) What is the ratio
K/K0 of the new kinetic energy of the
system to its...
A uniform solid disk of mass m = 3.06 kg and radius r = 0.200 m rotates about a fixed axis perpendicular to its face with angular frequency 6.09 rad/s. (a) Calculate the magnitude of the angular momentum of the disk when the axis of rotation passes through its center of mass. kg · m2/s (b) What is the magnitude of the angular momentum when the axis of rotation passes through a point midway between the center and the rim?...
1 out of A wheel has an inner radius Ry = 0.5 m and an outer radius R2 = 1 m. The wheel is able to rotate around an axis that passes through its center and perpendicular to its plane. Two forces F = 20 N and F2 = 8 N act on the wheel as shown in the figure below. The magnitude of the net torque (in N.m) acting on the wheel about the rotation axis is: →F2 a)...
1a. A cockroach of mass m lies on the rim of a uniform
disk of mass 9.00 m that can rotate freely about its
center like a merry-go-round. Initially the cockroach and disk
rotate together with an angular velocity of 0.456 rad/s. Then the
cockroach walks halfway to the center of the disk.
(a) What then is the angular velocity of the
cockroach-disk system?
(b) What is the ratio
K/K0 of the new kinetic energy of the
system to its...
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