A 870 kg car has four 14 kg wheels. When the car is moving, what fraction (K rotational /K total) of its total kinetic energy is due to rotation of the wheels about their axles? Assume that the wheels have the same rotational inertia as uniform disks of the same mass and size

A 870 kg car has four 14 kg wheels. When the car is moving, what fraction (K rotational /K total) of its total kinetic energy is due to rotation of the wheels about their axles? Assume that the wheels have the same rotational inertia as uniform disks of the same mass and size

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter13: Rotation Ii: A Conservation Approach

Section: Chapter Questions

Problem 30PQ

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Question

A 870 kg car has four 14 kg wheels. When the car is moving, what fraction (K_rotational /K_total) of its total kinetic energy is due to rotation of the wheels about their axles? Assume that the wheels have the same rotational inertia as uniform disks of the same mass and size. (Your result must be in multiples of 10 ^-2 and include 2 digit after the decimal point. That means if you get a result of a 9.22 x 10 ^-2 just type 9.22 in the answer box. Maximum of 3% of error is accepted in your answer.)

(Hint: Take I=12MR2I=12MR2)

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