15-103. A 4-lb ball B is traveling around in a circle ofradius r, = 3 ft with a speed (v3), = 6 ft/s. If the attachedcord is pulled down through the hole with a constant speedv, = 2 ft/s, determine the ball's speed at the instantn = 2 ft. How much work has to be done to pull down thecord? Neglect friction and the size of the ball.Bn = 3 ft(UB)1 = 6 ft/sv, = 2 ft/s

Since this ball is just rotating in the circle, we can apply At radius r1 (VB)1=ωr16 ft/s=ω×3ω=2…

Answered: 15-103. A 4-lb ball B is traveling…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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*15-104. A 4-lb ball B is traveling around in a circle of radius r, = 3 ft with a speed (vg), = 6 ft/s. If the attached cord is pulled down through the hole with a constant speed v, = 2 ft/s, determine how much time is required for the ball to reach a speed of 12 ft/s. How far r, is the ball from the hole when this occurs? Neglect friction and the size of the ball. Bn = 3 ft (UB)1 = 6 ft/s v, = 2 ft/s
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