A record is rotating in a horizontal plane at 33 rpm about a friction axis. The...
A record is rotating in a horizontal plane at 33 rpm about a friction axis. The record can be approximated as a disk 30 cm in diameter massing 125 grams. A small piece of clay (5 grams) is dropped vertically and sticks on the record 10 cm from the axis.
a)What is the angular speed after the clay sticks?
b) After a while, the clay dries out and starts to slide outward on the record. Just as it reaches the edge of the record, it sticks again. What is the angular speed then?
c) After more time drying, the clay slides off the record flying tangentially. What is the final angular speed of the record?
Homework Answers
In this problem no external torque is present, so angular
momentum remains constant.
Add Answer to:
A record is rotating in a horizontal plane at 33 rpm about a
friction axis. The...
A record on a record player spins at 45.0 rpm. Two small 28.0 g balls of...
A record on a record player spins at 45.0 rpm. Two small 28.0 g balls of clay are dropped on the record and hit it simultaneously, at the edge of the record and at opposite ends from one another. Treat the record as a disk with radius 7.50 cm and mass 465 g, and the clay balls as particles. What is the record's angular velocity just after the clay balls hit it? Give your answer in rad/s.
please draw a picture Q.3 A solid disk with a mass of 36 kg and a...
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 disk 15 cm in diameter rotates counterclockwise in a horizontal plane, accelerating uniformaly from 33...
A disk 15 cm in diameter rotates counterclockwise in a horizontal plane, accelerating uniformaly from 33 rpm to 45 rpm in 1 min. A) What is the angular acceleration of the disk? B) What is the angular speed of the disk 30 sec after it starts to accelerate? C) What is the tangential speed of a point on the edge of the disk 30 sec after it starts to accelerate? D) Through how many rotations does the disk turn while...
A horizontal vinyl record of mass 0.0856 kg and radius 0.0898 m rotates freely about a...
A horizontal vinyl record of mass 0.0856 kg and radius 0.0898 m
rotates freely about a vertical axis through its center with an
angular speed of 5.82 rad/s and a rotational inertia of 5.42 x
10-4 kg·m2. Putty of mass 0.0267 kg drops
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afterwards?
Chapter 11, Problem 055 Your answer is partially correct. A horizontal vinyl record of...
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A uniform rod of mass 3.00x10-2kg and length 0.420m rotates in a horizontal plane about a...
A uniform rod of mass 3.00x10-2kg and length 0.420m rotates in a horizontal plane about a fixed axis through its center and perpendicular to the rod. Two small rings, each with mass 0.170kg , are mounted so that they can slide along the rod. They are initially held by catches at positions a distance 5.50x10-2m on each side from the center of the rod, and the system is rotating at an angular velocity 27.0rev/min . Without otherwise changing the system,...
5. Disk A, of radius R1=10.0 cm and mass m1=5 kg is rotating about its axis...
5. Disk A, of radius R1=10.0 cm and mass m1=5
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in contact with another disk, B, of radius R2=15.0 cm and mass m2=6
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a) What is the energy of the first disk before contact?
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uniform rod of mass 3.30×10−2 kg and length 0.450 m rotates in a horizontal plane about...
uniform rod of mass 3.30×10−2 kg and length 0.450 m rotates in a horizontal plane about a fixed axis through its center and perpendicular to the rod. Two small rings, each with mass 0.250 kg , are mounted so that they can slide along the rod. They are initially held by catches at positions a distance 5.40×10−2 m on each side from the center of the rod, and the system is rotating at an angular velocity 30.0 rev/min . Without...
Page 13 9. A 49.8-kg athlete running at 4.54 m/s suddenly jumps onto a stationary playground...
Page 13 9. A 49.8-kg athlete running at 4.54 m/s suddenly jumps onto a stationary playground merry-go-round at a distance 1.45 m from the axis of rotation of the merry-go-round. She is traveling tangential to the edge of the merry-go-round just before jumping on. The moment of inertia about its axis of rotation is 625 kg m2 and very little friction at its rotation axis. What is the angular speed of the merry-go-round just after she has jumped onto it?...
A DVD of mass M = 20.0 g = 0.0200 kg and radius R = 6.00...
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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 horizontal vinyl record of mass 0.0856 kg and radius 0.0898 m
rotates freely about a vertical axis through its center with an
angular speed of 5.82 rad/s and a rotational inertia of 5.42 x
10-4 kg·m2. Putty of mass 0.0267 kg drops
vertically onto the record from above and sticks to the edge of the
record.What is the angular speed of the record immediately
afterwards?
Chapter 11, Problem 055 Your answer is partially correct. A horizontal vinyl record of...
A uniform rod of mass 3.00x10-2kg and length 0.420m rotates in a horizontal plane about a fixed axis through its center and perpendicular to the rod. Two small rings, each with mass 0.170kg , are mounted so that they can slide along the rod. They are initially held by catches at positions a distance 5.50x10-2m on each side from the center of the rod, and the system is rotating at an angular velocity 27.0rev/min . Without otherwise changing the system,...
5. Disk A, of radius R1=10.0 cm and mass m1=5
kg is rotating about its axis at a rate of 42.0 rpm. It is brought
in contact with another disk, B, of radius R2=15.0 cm and mass m2=6
kg at rest. Quickly, both disks start to rotate together at the
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bearings.
a) What is the energy of the first disk before contact?
b) What is the angular momentum of...
Page 13 9. A 49.8-kg athlete running at 4.54 m/s suddenly jumps onto a stationary playground merry-go-round at a distance 1.45 m from the axis of rotation of the merry-go-round. She is traveling tangential to the edge of the merry-go-round just before jumping on. The moment of inertia about its axis of rotation is 625 kg m2 and very little friction at its rotation axis. What is the angular speed of the merry-go-round just after she has jumped onto it?...
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