Physics · 2015
NEET 2015 · 3 May · Code E · Q11
A mass m moves in a circle on a smooth horizontal plane with velocity v_0 at a radius R_0. The mass is attached to a string which passes through a…
A mass m moves in a circle on a smooth horizontal plane with velocity $\displaystyle \mathrm{v}_0$ at a radius $\displaystyle \mathrm{R}_0$. The mass is attached to a string which passes through a smooth hole in the plane as shown.
The tension in the string is increased gradually and finally m moves in a circle of radius $\displaystyle \frac{\mathrm{R}_0}{2}$. The final value of the kinetic energy is :
The tension in the string is increased gradually and finally m moves in a circle of radius $\displaystyle \frac{\mathrm{R}_0}{2}$. The final value of the kinetic energy is :Official answer
(3)
$\displaystyle 2 \mathrm{mv}_0^2$
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