Homework Answers
A bug of mass 2.0 g is sitting at the edge of a CD of radius...
A bug of mass 2.0 g is sitting at the edge of a CD of radius 3.0 cm. If the CD is spinning at 250 rpm, what is the angular momentum of the bug?
A bug of mass 3.8 g is sitting at the edge of a CD of radius...
A bug of mass 3.8 g is sitting at the edge of a CD of radius 4.0 cm. If the CD is spinning at 250 rpm, what is the angular momentum of the bug?
A disk of mass m, = 70.0 g and radius r , = 4.50 cm slides...
A disk of mass m, = 70.0 g and radius r , = 4.50 cm slides on a frictionless sheet of ice with velocity v, where v = 12.00 m/s, as shown in a top-down view in figure (a) below. The edge of this disk just grazes the edge of a second disk in a glancing blow. The second disk has a mass m2 = 140 g, a radius r2 = 6.00 cm, and is initially at rest. As the...
Consider a spinning CD which has a mass of 15.0 g. If the radius of the...
Consider a spinning CD which has a mass of 15.0 g. If the radius of the CD is 7.9 cm, and if it rotates about its centre at an angular frequency of 50.3 rad/s, what is its rotational kinetic energy (in J)? Assume the CD is a solid disk (i.e. ignore the hole in the center.).
You are sitting on a merry-go-round of mass 200 kg and radius 2m that is at...
You are sitting on a merry-go-round of mass 200 kg and radius 2m that is at rest (not spinning). Your mass is 50 kg. Your friend pushes the edge of the merry go round with 100 N of force, applied at a 90 deg angle. (hint: the merry-go-round is a disk). a. How much torque did your friend apply? b. What is your angular acceleration if you are sitting in the middle of the merry-go-round? c. What is your angular...
A woman with a mass m = 68.0 kg is sitting on the edge of a...
A woman with a mass m = 68.0 kg is sitting on the edge of a large rotating disk with a mass M = 105 kg and a radius R = 3.20 m. The disk and woman are rotating at a rate ω = 0.500 rev/sec. Determine the moment of inertia I for the disk and woman assuming that the woman acts like a point mass at the edge of the disk. Calculate the total angular momentum for the disk...
Three children are riding on the edge of a merry-go-round that is a disk of mass...
Three children are riding on the edge of a merry-go-round that is a disk of mass 110 kg, radius 1.7 m, and is spinning at 16 rpm. The children have masses of 22.8 kg, 26.4 kg, and 31 kg. M = 110 kg m1 = 22.8 kg m2 = 26.4 kg m3 = 31 kg r = 1.7 m f = 16 rpm If the child who has a mass of 26.4 kg moves to the center of the merry-go-round,...
A bug of mass 0.028 kg is at rest on the edge of a solid cylindrical...
A bug of mass 0.028 kg is at rest on the edge of a solid cylindrical disk (M = 0.10 kg,R = 0.20 m) rotating in a horizontal plane around the vertical axis through its center. The disk is rotating at 12.0 rad/s. The bug crawls to the center of the disk. (a) What is the new angular velocity of the disk? 18.72 rad/s (b)What is the change in the kinetic energy of the system?0.126 J (c) If the bug...
1. Three children are riding on the edge of a merry‑go‑round that has a mass of...
1. Three children are riding on the edge of a merry‑go‑round that has a mass of 105 kg and a radius of 1.80 m. The merry‑go‑round is spinning at 22.0 rpm. The children have masses of 22.0, 28.0, and 33.0 kg. If the 28.0 kg child moves to the center of the merry‑go‑round, what is the new angular velocity in revolutions per minute? Ignore friction, and assume that the merry‑go‑round can be treated as a solid disk and the children...
A DVD is spinning at 592.309 rpm. What is the size of the angular momentum of the DVD if it has a circumference of...
A DVD is spinning at 592.309 rpm. What is the size of the angular momentum of the DVD if it has a circumference of 39.543 cm and a mass of 10.803 g? Enter your answer in kg m2/s to the thousandth's place.
A disk of mass m, = 70.0 g and radius r , = 4.50 cm slides on a frictionless sheet of ice with velocity v, where v = 12.00 m/s, as shown in a top-down view in figure (a) below. The edge of this disk just grazes the edge of a second disk in a glancing blow. The second disk has a mass m2 = 140 g, a radius r2 = 6.00 cm, and is initially at rest. As the...
A DVD is spinning at 592.309 rpm. What is the size of the angular momentum of the DVD if it has a circumference of 39.543 cm and a mass of 10.803 g? Enter your answer in kg m2/s to the thousandth's place.
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