Question

1. A disk of mass M=160kg and radius R=0.40m spins with an initial rate of 12...

1. A disk of mass M=160kg and radius R=0.40m spins with an initial rate of 12 revolutions per second. Because of friction in the bearing, the disk slows down at a uniform rate. After 20 minutes it comes to a stop.

(a) How many revolutions does the disk make before coming to rest?

(b) What is the moment of inertia of the disk?

(c) Find the angular acceleration of the disk as it slows down.

(d) Find the torque that acts on the disk while it is slowing down.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A uniform disk has a mass of 9 kg and a radius of 20 cm. It...
A uniform disk has a mass of 9 kg and a radius of 20 cm. It completes 15 revolutions in 11 seconds when starting from rest. (12 points) a. Find the angular acceleration of the disk. b. Find the moment of inertia of the disk. c. Find the net torque on the disk.
A large disk with a radius of 12 centimeters and a mass of 15.0 kg is...
A large disk with a radius of 12 centimeters and a mass of 15.0 kg is initially rotating at a rate of 96 revolutions per minute. A brake pad is applied to the edge of the disk, exerting a tangential force of 4.5 Newtons. (a) What is the disk’s angular acceleration as it slows? (b) How much time does it take for the disk to stop? (c) What was the disk’s initial angular momentum?
A potter's wheel is a disk that has a mass of 5.0 kg and a radius...
A potter's wheel is a disk that has a mass of 5.0 kg and a radius of 0.5 m. When turned on, a motor spins up the wheel with a constant torque of 7.0 N·m for 10.0 seconds. Note: the moment of inertia of a solid disk is given by 1/2 MR2. Also, there is no translational motion, the wheel simply spins in place. a. [8 pts.] Find the wheel's angular acceleration in radians/sec2 during these 10 s. b. [8...
A spinning top is an old child's toy that spins on a pointed end. A top...
A spinning top is an old child's toy that spins on a pointed end. A top is spinning at 4 rev/s and comes to a stop in 64 seconds. Assume the top slows down with constant angular acceleration. An insect is unfortunate enough to be sitting on the edge of the 3 cm radius spinning top. a. What is the tangential acceleration of the insect? b. How many revolutions does it make before coming to a stop? c. How many...
A disk with mass m = 8.5 kg and radius R = 0.35 m begins at...
A disk with mass m = 8.5 kg and radius R = 0.35 m begins at rest and accelerates uniformly for t = 18.9 s, to a final angular speed of ? = 29 rad/s. 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? e) What is the tangential...
A motor spins a disk (Idisk = 24.2 kg*m2) with a torque of 39 N*m, and...
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?
A uniform disk of mass Mdisk = 4 kg and radius R = 0.24 mhas a...
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...
A potter’s wheel, a thick stone disk of radius 0.500 m and mass 100 kg, is...
A potter’s wheel, a thick stone disk of radius 0.500 m and mass 100 kg, is freely rotating at 70.0 rev/min. The potter can stop the wheel by pressing a wet rag against the rim and exerting a radially inward force of 35.0 N. If the applied force slows the wheel down with an angular acceleration of 0.875rad/s2 , calculate the torque acting on the wheel and the coefficient of kinetic friction between the wheel and the rag
A disk with mass m = 10.3 kg and radius R = 0.34 m begins at...
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)...
A hoop of mass M and radius R, initially at rest, falls onto a disk of...
A hoop of mass M and radius R, initially at rest, falls onto a disk of the same mass and radius but an initial angular speed of ω1. There’s friction between the hoop and disk, but there’s no net external torque on the system consisting of the hoop and disk. (). a. For this process, the kinetic energy of the system consisting of the hoop and disk is conserved. True/False? b.For this process, the angular momentum of the system consisting...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT