Consider a wheel and axle assembly rolling down a pair of inclined rails. The reason why the wheel and axle accelerates more slowly than a block of the same mass sliding down the rails without friction s: O the frictional force for the block is less than for the wheel and axle, O some of the potential encrgy of the whoel and axle is converted into rotational kinetic energy. O the wheel and axle docs more work against the frictional force. O the block starts with less rotational kinetic energy frictional forces play no part in rolling motion.

Consider a wheel and axle assembly rolling down a pair of inclined rails. The reason why the wheel and axle accelerates more slowly than a block of the same mass sliding down the rails without friction s: O the frictional force for the block is less than for the wheel and axle, O some of the potential encrgy of the whoel and axle is converted into rotational kinetic energy. O the wheel and axle docs more work against the frictional force. O the block starts with less rotational kinetic energy frictional forces play no part in rolling motion.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter10: Rotational Motion And Angular Momentum

Section: Chapter Questions

Problem 30PE: To develop muscle tone, a woman lifts a 2.00-kg weight held in her hand. She uses her biceps muscle...

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To develop muscle tone, a woman lifts a 2.00-kg weight held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. (a) What is the angular acceleration if the weight is 24.0 cm from the elbow joint, her forearm has a moment of inertia of 0.250kg-m2 and the net force she exerts is 750 N at an effective perpendicular lever arm of 2.00 cm? (b) How much work does she do?
A Eric is twirling a ball of mass m = 0.150 kg attached to a lightweight string in a vertical circle. If the total energy of the system is conserved, by what factor does the tension on the string increase at the bottom compared with the top of the circle?
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To develop muscle tone, a woman lifts a 3.70 kg mass held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0°. Ignore gravity. (a) What is the angular acceleration if the mass is 24.0 cm from the elbow joint, her forearm having a moment of inertia of 0.250 kg · m2, and the muscle force being 760 N at an effective perpendicular lever arm of 2.50 cm? (b) How much work does she do?
Trucks can be run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 200p rad/s. Suppose that one such flywheel is a solid, uniform cylinder with a mass of 500 kg and a radius of 1.0 m. (a) What is the kinetic energy of the flywheel after charging? (b) If the truck uses an average power of 8.0 kW, for how many minutes can it operate between chargings?
To develop muscle tone, a woman lifts a 2.00-kg weight held in her hand. She uses her biceps muscle to flex the lower arm through an angle of 60.0. (a) What is the angular acceleration if the weight is 24.0 cm from the elbow joint, her forearm has a moment of inertia of 0.0250 kg.m, and the net force she exerts is 750 N at an effective perpendicular lever arm of 2.00 cm? (b) Howmuch work does she do?
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Trucks can be run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 683 rad/s. One such flywheel is a solid, uniform cylinder with a mass of 535 kg and a radius of 1.2 m that rotates about its central axis. What is the kinetic energy of the flywheel after charging? If the truck uses an average power of 8.4 kW, for how many minutes can it operate between chargings?
A. Similar bars as shown are translating and/or rotating with the given linear and angular speeds. Which bar has the greatest amount of kinetic energy? B. Similar bars as shown are translating and/or rotating with the given linear and angular speeds. Which bar has the least amount of kinetic energy?
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