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A thin, uniform, 3.80-kg bar, 80.0 cm long, has very small

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman ISBN: 9780321675460 31

Solution for problem 63P Chapter 10

University Physics | 13th Edition

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University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

University Physics | 13th Edition

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Problem 63P

A thin, uniform, 3.80-kg bar, 80.0 cm long, has very small 2.50-kg balls glued on at either end (?Fig. P10.57?). It is supported horizontally by a thin, horizontal, frictionless axle passing through its center and perpendicular to the bar. Suddenly the right-hand ball becomes detached and falls off, but the other ball remains glued to the bar. (a) Find the angular acceleration of the bar just after the ball falls off. (b) Will the angular acceleration remain constant as the bar continues to swing? If not, will it increase or decrease? (c) Find the angular velocity of the bar just as it swings through its vertical position.

Step-by-Step Solution:

Solution 63P Step 1 of 6: Given data, Mass of bar, M=3.8 kg Length of rod, L=80cm=0.8 m Mass of the ball, m=2.5 kg To find the new center-of-mass relative to where the axle passes through the bar. L That is, x = m2 …………….1 cm M+m The moment of inertia of the bar and ball: I = Ibar+ Iball I = ML2 + m( ) 2 12 2 ML2 mL2 I = 12 + 4 ……………….2

Step 2 of 6

Chapter 10, Problem 63P is Solved
Step 3 of 6

Textbook: University Physics
Edition: 13
Author: Hugh D. Young, Roger A. Freedman
ISBN: 9780321675460

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A thin, uniform, 3.80-kg bar, 80.0 cm long, has very small