See-saw end-to-end length: 4.5 meters See-saw mass: 15 kg Heavy kid's mass: 39 kg Light kid's mass: 25 kg Tilt angle: 14 degrees (a) What is the magnitude of the net torque on the see-saw due to gravity, in newton-meters? N m (b) What is the moment of inertia of the two-kid system about the pivot at the center of the see-saw? kg m2 (c) What is the magnitude of the see-saw's angular acceleration at this instant? rad/s?

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Author:Raymond A. Serway, John W. Jewett
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Chapter10: Rotation Of A Rigid Object About A Fixed Axis
Section: Chapter Questions
Problem 10.28P: The fishing pole in Figure P10.28 makes an angle of 20.0 with the horizontal. What is the torque...
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Scenario: A heavy kid and a light kid are at the two ends of a see-saw, modeled as a long thin rod with
point masses at each end, pivoted at the middle. The see-saw is tilted from horizontal.
See-saw end-to-end length: 4.5 meters
See-saw mass: 15 kg
Heavy kid's mass: 39 kg
Light kid's mass: 25 kg
Tilt angle: 14 degrees
(a) What is the magnitude of the net torque on the see-saw due to gravity, in newton-meters?
N m
(b) What is the moment of inertia of the two-kid system about the pivot at the center of the see-saw?
kg m2
(c) What is the magnitude of the see-saw's angular acceleration at this instant?
rad/s?
Transcribed Image Text:Scenario: A heavy kid and a light kid are at the two ends of a see-saw, modeled as a long thin rod with point masses at each end, pivoted at the middle. The see-saw is tilted from horizontal. See-saw end-to-end length: 4.5 meters See-saw mass: 15 kg Heavy kid's mass: 39 kg Light kid's mass: 25 kg Tilt angle: 14 degrees (a) What is the magnitude of the net torque on the see-saw due to gravity, in newton-meters? N m (b) What is the moment of inertia of the two-kid system about the pivot at the center of the see-saw? kg m2 (c) What is the magnitude of the see-saw's angular acceleration at this instant? rad/s?
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