15-111. A box having a weight of 8 lb is moving around in a circle of radius rA=2 ft with a speed of (vA)1=5 ft/s while connected to the end of a rope. If the rope is pulled inward with a constant speed of v, =4 ft/s, determine the speed of the box at the instant rg = 1 ft. How much work is done after pulling in the rope from A to B? Neglect friction and the size of the box. Tg = 1 ft A = 2 ff v, = 4 ft/s (vA)1 = 5 ft/s

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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15-111. A box having a weight of 8 lb is moving around in
a circle of radius rA=2 ft with a speed of (vA)1=5 ft/s while
connected to the end of a rope. If the rope is pulled inward
with a constant speed of v, =4 ft/s, determine the speed of
the box at the instant rg = 1 ft. How much work is done
after pulling in the rope from A to B? Neglect friction and
the size of the box.
Tg = 1 ft
A = 2 ff
v, = 4 ft/s
(vA)1 = 5 ft/s
Transcribed Image Text:15-111. A box having a weight of 8 lb is moving around in a circle of radius rA=2 ft with a speed of (vA)1=5 ft/s while connected to the end of a rope. If the rope is pulled inward with a constant speed of v, =4 ft/s, determine the speed of the box at the instant rg = 1 ft. How much work is done after pulling in the rope from A to B? Neglect friction and the size of the box. Tg = 1 ft A = 2 ff v, = 4 ft/s (vA)1 = 5 ft/s
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