Rotation Review-AP

A carousel—a horizontal rotating platform—of radius r is initially at rest, and then begins to accelerate constantly until it has reached an angular velocity ω after 2 complete revolutions. What is the angular acceleration of the carousel during this time?

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Tags

NGSS.HS-PS2-1

A horizontally-mounted disk with moment of inertia I spins about a frictionless axle. At time t=0, the initial angular speed of the disk is ω. A constant torque τ is applied to the disk, causing it to come to a halt in time t. How much Power is required to dissipate the wheel’s energy during this time?

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Tags

NGSS.HS-PS3-1

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A certain star, of mass m and radius r, is rotating with a rotational velocity ω . After the star collapses, it has the same mass but with a much smaller radius. Which statement below is true?

a. The star's moment of inertia I has decreased, and its angular momentum L has increased.

b. The star's moment of inertia I has decreased, and its angular velocity ω has decreased.

c. The star's moment of inertia I remains constant, and its angular momentum L has increased.

d. The star's angular momentum L remains constant, and its rotational kinetic energy has decreased.

e. The star's angular momentum L remains constant, and its rotational kinetic energy has increased.

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Tags

NGSS.HS-PS3-2

If a constant net torque is applied to an object, that object will

A) rotate with constant linear velocity.

B) having an increasing moment of inertia.

C) rotate with constant angular velocity.

D) having a decreasing moment of inertia.

E) rotate with constant angular acceleration.

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A disk, a hoop, and a solid sphere are released at the same time at the top of an inclined plane. They are all uniform and roll without slipping. In what order do they reach the bottom?

A) hoop, sphere, disk

B) hoop, disk, sphere

C) sphere, disk, hoop

D) disk, hoop, sphere

E) sphere, hoop, disk

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Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4