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The top is figure has moment of inertia...

The top is figure has moment of inertia equal to `4.00xx10^(-4) kgm^(2)` and is initially at rest. It is free to rotate about the stationary axis `"AA"'`. A string wrapped around a ped alonng the axis of the top is pulled in such a manners as to maintain a constant tension of `5.57N`.If the string does not slip while it is unwound from the peg, what is the angular speed of the top after `80.0 CM` of string has been pulled of the peg?

A

`130 rad//s`

B

`142 rad//s`

C

`149 rad//s`

D

`120 rad//s`

Text Solution

Verified by Experts

The correct Answer is:
C
`w=(5.57 N)xx(0.800 m)=4.46 J`
`DeltaK=1/2I(omega_(f)^(2)-omega_(i)^(2))`
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