Part A A heavy solid disk rotating freely and slowed only by friction applied at its...
Part A
A heavy solid disk rotating freely and slowed only by friction applied at its outer edge takes 120 seconds to come to a stop. If the disk had twice the radius and twice the mass, but the frictional force remained the same, the time it would it take the wheel to come to a stop from the same initial rotational speed is
A heavy solid disk rotating freely and slowed only by friction applied at its outer edge takes 120 seconds to come to a stop. If the disk had twice the radius and twice the mass, but the frictional force remained the same, the time it would it take the wheel to come to a stop from the same initial rotational speed is
| 960c | |
| 30s | |
| 120 s | |
| 480s |
Homework Answers
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Part A
A heavy solid disk rotating freely and slowed only by friction
applied at its...
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A potter's wheel having a radius of 0.500 m and mass 45.0 kg is rotating freely at 50.0 rev/min in a clockwise direction. The potter can stop the wheel by pressing a wet rag against the outside rim of the wheel and exerting a radially inward force of 70.0 N. Since this force is in the radial direction, it alone cannot cause the wheel to slow its spinning. What can happen, however, is that a normal force can result from...
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A 3 kg disk of radius 0.25m is rotating freely at an angular speed of 100...
A 3 kg disk of radius 0.25m is rotating freely at an angular speed of 100 rad/s on a shaft passing through the center of mass of the disk. A 2 kg solid ball of the same radius, initially not rotating, slides down the shaft (the shaft passes through the ball's center of mass) and is coupled to the disk. Assuming that the rotational inertia is of the shaft is negligible, (b) What is the angular speed of the disk-ball...
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please draw a picture
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A large solid disk of radius 0.51m freely rotates about a vertical frictionless axis at an...
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A potter's wheel having a radius of 0.500 m and mass 45.0 kg is rotating freely at 50.0 rev/min in a clockwise direction. The potter can stop the wheel by pressing a wet rag against the outside rim of the wheel and exerting a radially inward force of 70.0 N. Since this force is in the radial direction, it alone cannot cause the wheel to slow its spinning. What can happen, however, is that a normal force can result from...
A 3 kg disk of radius 0.25m is rotating freely at an angular speed of 100 rad/s on a shaft passing through the center of mass of the disk. A 2 kg solid ball of the same radius, initially not rotating, slides down the shaft (the shaft passes through the ball's center of mass) and is coupled to the disk. Assuming that the rotational inertia is of the shaft is negligible, (b) What is the angular speed of the disk-ball...
A heavy turntable, used for rotating large objects, is a solid cylindrical wheel that can rotate about its central axle with negligible friction. The radius of the wheel is 0.330 m. A constant tangential force of 200 N applied to its edge causes the wheel to have an angular acceleration of 0.896 rad/s2. (a) What is the moment of inertia of the wheel (in kg ·m2)? kg · m2 (b) What is the mass (in kg) of the wheel? kg...
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please draw a picture
Q.3 A solid disk with a mass of 36 kg and a radius of 0.7 m is spinning around an axis through its center, it rotates with an angular speed of 3 full turns per second. You drop a 12 kg mass onto the disk at the edge, it sticks to the disk, reducing the angular speed to ws. Next you apply a 30 N force tangentially at the edge of the disk to slow it...
A large solid disk of radius 0.51m freely rotates about a vertical frictionless axis at an initial angular speed of 9 rad's. A small friction brake is used to bring the disk to rest in a time of 4.4 s by pressing the brake radially inward against the rim of the disk with a constant force of 36 N as shown in the figure below The coefficient of friction between the brake and the disk is 0.37 Side View Top...
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A solid disk with mass M (1.00 kg)
and radius R (0.200 m) is sitting on a frictionless surface. We
analyzed the situation at left below, where a force F (2.00 N) is
applied for four seconds, by a string that has been wrapped around
the outer surface of a cylindrical disk.
Two students are debating the
following question. ‘The same force is applied for the same amount
of time, but this time by a string attached to the edge...
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