A disc shaped body has two tight windings of light threads, one on the inner rim of radius \[R=1\text{ }m\]and the other on outer rim of radius 2R (see figure). It is kept on a horizontal surface and the ends of the two threads are pulled horizontally in opposite directions with force of equal magnitude\[F=20N\]. Mass of the body and its moment of inertia about an axis through centre 0 and perpendicular to the plane of the figure are \[M=4\text{ }kg\]and \[I=8\,kg{{m}^{2}}\] respectively. Find the kinetic energy of the body 2 seconds after the forces begin to act, if the surface is rough enough to ensure rolling without sliding. |
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A) \[\frac{200}{3}J\]
B) \[\frac{100}{3}J\]
C) \[\frac{125}{3}J\]
D) \[\frac{250}{9}J\]
Correct Answer: B
Solution :
[b] Let the friction be f.You need to login to perform this action.
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