Homework Answers
Disk A, with a mass of 2.0 kg and a radius of 90 cm, rotates clockwise...
Disk A, with a mass of 2.0 kg and a radius of 90 cm, rotates clockwise about a frictionless vertical axle at 50 rev/s. Disk B, also 2.0 kg but with a radius of 80 cm , rotates counterclockwise about that same axle, but at a greater height than disk A, at 50 rev/s. Disk B slides down the axle until it lands on top of disk A, after which they rotate together. After the collision, what is magnitude of...
Disk A, with a mass of 2.0 kg and a radius of 70 cm , rotates...
Disk A, with a mass of 2.0 kg and a radius of 70 cm , rotates clockwise about a frictionless vertical axle at 20 rev/s . Disk B, also 2.0 kg but with a radius of 30 cm , rotates counterclockwise about that same axle, but at a greater height than disk A, at 20 rev/s . Disk B slides down the axle until it lands on top of disk A, after which they rotate together. After the collision, what...
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...
1- A block slides along a frictionless surface at 2.4 m/s. A second 3.5-kg block, sliding...
1- A block slides along a frictionless surface at 2.4 m/s. A second 3.5-kg block, sliding at a faster 7.5 m/s, collides with the first from behind and sticks to it. The final velocity of the combined blocks is 4.6 m/s. What was the mass of the first block? 2-A 15 g ball of clay traveling west at 4 m/s collides with a 50 g ball of clay traveling 30° north of east at 3.5 m/s. What is the speed...
Two disks are mounted (like a merry-go-round) on low-friction bearings on the same axle and can...
Two disks are mounted (like a merry-go-round) on low-friction bearings on the same axle and can be brought together so that they couple and rotate as one unit. The first disk, with rotational inertia 3.00 kg m about its central axis, is set spinning counterclockwise at 550 rev/min. The second disk, with rotational inertia 6.40 kg m about its central axis, is set spinning counterclockwise at 800 rev/min. They then couple together. (a) What is their angular speed after coupling?...
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
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
same rate. Both disks rotate on their shafts on low friction
bearings.
a) What is the energy of the first disk before contact?
b) What is the angular momentum of...
Two disks are mounted (like a merry-go-round) on low-friction bearings on the same axle and can...
Two disks are mounted (like a merry-go-round) on low-friction bearings on the same axle and can be brought together so that they couple and rotate as one unit. The first disk, with rotational inertia 3.25 kg m2 about its central axis, is set spinning counterclockwise (which may be taken as the positive direction) at 181 rev/min. The second disk, with rotational inertia 7.95 kg.m2 about its central axis, is set spinning counterclockwise at 879 rev/min. They then couple together. (a)...
A horizontal platform in the shape of a circular disk rotates on a frictionless bearing about...
A horizontal platform in the shape of a circular disk rotates on
a frictionless bearing about a vertical axle through the center of
the disk. The platform has a radius of 4.64 m and a rotational
inertia of 141 kg·m2 about the axis of rotation. A 53.2
kg student walks slowly from the rim of the platform toward the
center. If the angular speed of the system is 1.48 rad/s when the
student starts at the rim, what is the...
A Texas cockroach of mass 0.17 kg runs counterclockwise around the rim of a lazy Susan...
A Texas cockroach of mass 0.17 kg runs counterclockwise around the rim of a lazy Susan (a circular disk mounted on a vertical axle) that has radius 15 cm, rotational inertia 4.9 ✕ 10−3 kg · m2, and frictionless bearings. The cockroach's speed (relative to the ground) is 2.0 m/s, and the lazy Susan turns clockwise with angular speed ω0 = 2.9 rad/s. The cockroach finds a bread crumb on the rim and, of course, stops. (a) What is the...
A uniform 2 kg solid disk of radius R = 0.4 m is free to rotate...
A uniform 2 kg solid disk of radius R = 0.4 m is free to rotate on a frictionless horizontal axle through its center. The disk is initially at rest, and then a 10 g bullet traveling at 590 m/s is fired into it as shown in the figure below. If the bullet embeds itself in the disk at a vertical distance of 0.2 m above the axle, what will be the angular velocity of the disk?
Disk A, with a mass of 2.0 kg and a radius of 90 cm, rotates clockwise about a frictionless vertical axle at 50 rev/s. Disk B, also 2.0 kg but with a radius of 80 cm , rotates counterclockwise about that same axle, but at a greater height than disk A, at 50 rev/s. Disk B slides down the axle until it lands on top of disk A, after which they rotate together. After the collision, what is magnitude of...
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...
Two disks are mounted (like a merry-go-round) on low-friction bearings on the same axle and can be brought together so that they couple and rotate as one unit. The first disk, with rotational inertia 3.00 kg m about its central axis, is set spinning counterclockwise at 550 rev/min. The second disk, with rotational inertia 6.40 kg m about its central axis, is set spinning counterclockwise at 800 rev/min. They then couple together. (a) What is their angular speed after coupling?...
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
same rate. Both disks rotate on their shafts on low friction
bearings.
a) What is the energy of the first disk before contact?
b) What is the angular momentum of...
Two disks are mounted (like a merry-go-round) on low-friction bearings on the same axle and can be brought together so that they couple and rotate as one unit. The first disk, with rotational inertia 3.25 kg m2 about its central axis, is set spinning counterclockwise (which may be taken as the positive direction) at 181 rev/min. The second disk, with rotational inertia 7.95 kg.m2 about its central axis, is set spinning counterclockwise at 879 rev/min. They then couple together. (a)...
A horizontal platform in the shape of a circular disk rotates on
a frictionless bearing about a vertical axle through the center of
the disk. The platform has a radius of 4.64 m and a rotational
inertia of 141 kg·m2 about the axis of rotation. A 53.2
kg student walks slowly from the rim of the platform toward the
center. If the angular speed of the system is 1.48 rad/s when the
student starts at the rim, what is the...
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