The toy-top (initially at rest) shown in the figure, has a moment of inertia 4 x 10 -4 kg m 2 and it is free to rotate about the stationary axis AA '. The string wrapped around the peg of the toy-top is pulled outwards without letting it slip and simultaneously maintaining a constant tension of 5. 625 N. If 
is the angular speed (in rad s -1 ) of the top after 80 cm of string has been pulled off the peg, then mark your answer as 
.
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
1.50
Work done
= F x 
t = 5.625 x 0.8 m = 4.5 J and
work done = 
…( 
top starts from rest, 
= 0)
= 150rad/s
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