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 is magnitude of their common angular velocity (in rev/s)?
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 n mass of 2. 0 kg and a radius of 90 cm, rotates...
Disk A, with n mass of 2. 0 kg and a radius of 90 cm, rotates clockwise about a frictionless vertical axle at 20 rev/g. Disk B, also 2.0 kg but with a radius of 20 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 is magnitude of...
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...
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...
A merry-go-round modeled as a disk of mass 100 kg and radius 2.0 m is rotating...
A merry-go-round modeled as a disk of mass 100 kg and radius 2.0 m is rotating around a frictionless vertical axle. After a person of mass 60 kg jumps onto the merry-go-round, the system’s angular speed decreases to 2.0 rad/s. If the person walks slowly from the edge toward the center, find the change in the system’s rotational kinetic energy caused by her movement to 0.5 m from the center.
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 solid, uniform disk of mass 1.00 kg and radius .250m rotates with initial angular velocity...
A solid, uniform disk of mass 1.00 kg and radius .250m rotates with initial angular velocity of +26.3 rads/s about a frictionless vertical spindle through the center of the disk. A flat rectangular steel bar of mass 0.850 kg, length 0.400m, and width 0.050 M is dropped onto the disk so that the spindle passes through the center of the bar and is perpendicular to the plane of the bar. Assuming that there are no external torques on the system...
1a. 1b. A certain gyroscope consists of a uniform disk with a 33.0 cm radius mounted...
1a.
1b. A certain gyroscope consists of a uniform disk with a 33.0
cm radius mounted at the center of an axle that is 11.0 cm long and
of negligible mass. The axle is horizontal and supported at one
end. If the disk is spinning around the axle at 1500 rev/min, what
is the precession rate?
In the figure, a small 0.372 kg block slides down a frictionless surface through height h = 0.918 m and then sticks to a...
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...
Disk A, with n mass of 2. 0 kg and a radius of 90 cm, rotates clockwise about a frictionless vertical axle at 20 rev/g. Disk B, also 2.0 kg but with a radius of 20 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 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...
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...
1a.
1b. A certain gyroscope consists of a uniform disk with a 33.0
cm radius mounted at the center of an axle that is 11.0 cm long and
of negligible mass. The axle is horizontal and supported at one
end. If the disk is spinning around the axle at 1500 rev/min, what
is the precession rate?
In the figure, a small 0.372 kg block slides down a frictionless surface through height h = 0.918 m and then sticks to a...
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