Question

2. A centrifuge has a rotational inertia of 5.50 × 10?³ kg•m². How much energy must be supplied to bring it from rest to 79.6 revolutions/s? (hint, remember 1 revolution is 2 ? radians) A. 583 J B. 743 J C. 627 J D. 688 J E. 570 J 3. An ice dancer with her arms stretched out starts into a spin with an angular velocity of 1.0 rad/s. Her moment of inertia with her arms stretched out is 2.48 kg•m. What is her angular velocity when she pulls in her arms to make her moment of inertia 1.4 kg•m? A. 1.8 rad/s B. 0.56 rad/s C. 18 rad/s D. 56 rad/s E. 1.0 rad/s

          2. A centrifuge has a rotational inertia of 5.50 × 10?³ kg•m². How much energy must be supplied to bring it from rest to 79.6 revolutions/s? (hint, remember 1 revolution is 2 ? radians)
A. 583 J
B. 743 J
C. 627 J
D. 688 J
E. 570 J

3. An ice dancer with her arms stretched out starts into a spin with an angular velocity of 1.0 rad/s. Her moment of inertia with her arms stretched out is 2.48 kg•m. What is her angular velocity when she pulls in her arms to make her moment of inertia 1.4 kg•m?

A. 1.8 rad/s
B. 0.56 rad/s
C. 18 rad/s
D. 56 rad/s
E. 1.0 rad/s

Show more…

2. A centrifuge has a rotational inertia of 5.50 × 10?³ kg•m². How much energy must be supplied to bring it from rest to 79.6 revolutions/s? (hint, remember 1 revolution is 2 ? radians)
A. 583 J
B. 743 J
C. 627 J
D. 688 J
E. 570 J

3. An ice dancer with her arms stretched out starts into a spin with an angular velocity of 1.0 rad/s. Her moment of inertia with her arms stretched out is 2.48 kg•m. What is her angular velocity when she pulls in her arms to make her moment of inertia 1.4 kg•m?

A. 1.8 rad/s
B. 0.56 rad/s
C. 18 rad/s
D. 56 rad/s
E. 1.0 rad/s

Added by Carla L.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Ivan Kochetkov

06/08/2022

Step 1

6 revolutions/s. Given: Initial angular speed, ω₀ = 0 rad/s Final angular speed, ω = 79.6 rev/s * 2π rad/rev = 500.8 rad/s Rotational inertia, I = 5.50 x 10^3 kg*m^2 Using the formula for work done to change kinetic energy: Work = ΔKE = KE_final - KE_initial Work Show more…

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2. A centrifuge has a rotational inertia of 5.50 !! 10⁻³ kg•m². How much energy must be supplied to bring it from rest to 79.6 revolutions/s? (hint, remember 1 revolution is 2 π radians) A. 583 J B. 743 J C. 627 J D. 688 J E. 570 J 3. An ice dancer with her arms stretched out starts into a spin with an angular velocity of 1.0 rad/s. Her moment of inertia with her arms stretched out is 2.48 kg•m. What is her angular velocity when she pulls in her arms to make her moment of inertia 1.4 kg•m? A. 1.8 rad/s B. 0.56 rad/s C. 18 rad/s D. 56 rad/s E. 1.0 rad/s

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