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13. Rotational Inertia & Energy

Energy of Rolling Motion

13. Rotational Inertia & Energy

Energy of Rolling Motion

Guided videos.

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Energy of Rolling Motion (Surface vs Air)

Energy of Rolling Motion (Surface vs Air)

Ratio of energies of cylinder on surface

Ratio of energies of cylinder on surface

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Anderson Video - Pure Rolling Motion

Anderson Video - Pure Rolling Motion

Rotational Kinetic Energy

Rotational Kinetic Energy

Practice this topic

Multiple Choice

A 150-g baseball, 3.85 cm in radius, leaves the pitcher's hand with 30 m/s horizontal and 20 rad/s clockwise. Calculate the ball's linear, rotational, and total kinetic energy.

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Multiple Choice

A hollow sphere of mass M and radius R rolls without slipping on a horizontal surface with angular speed W. Calculate the ratio of its linear kinetic energy to its total kinetic energy.

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Textbook Question

An airplane propeller is 2.08 m in length (from tip to tip) and has a mass of 117 kg. When the airplane's engine is first started, it applies a constant torque of 1950 N•m to the propeller, which starts from rest. (e) What is the instantaneous power output of the motor at the instant that the propeller has turned through 5.00 revolutions?

Has a video solution.

Textbook Question

(a) Compute the torque developed by an industrial motor whose output is 150 kW at an angular speed of 4000 rev/min.

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Textbook Question

An electric motor consumes 9.00 kJ of electrical energy in 1.00 min. If one-third of this energy goes into heat and other forms of internal energy of the motor, with the rest going to the motor output, how much torque will this engine develop if you run it at 2500 rpm?

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Textbook Question

A 2.80-kg grinding wheel is in the form of a solid cylinder of radius 0.100 m. (a) What constant torque will bring it from rest to an angular speed of 1200 rev/min in 2.5 s?

Has a video solution.

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