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# Question and Answer

A very small particle rests on the top of a hemisphere of radius $${20}{c}{m}$$. Calculate the smallest horizontal velocity to be given to it if it is to leave the hemisphere without sliding down its surface, take $${g}={9.8}{m}/{s}^{{{2}}}$$.
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## QuestionPhysicsClass 11

A very small particle rests on the top of a hemisphere of radius $${20}{c}{m}$$. Calculate the smallest horizontal velocity to be given to it if it is to leave the hemisphere without sliding down its surface, take $${g}={9.8}{m}/{s}^{{{2}}}$$.

## Answer

The particle will leave the hemisphere, when normal reaction $${R}$$ becomes zero. In that event,
$$\frac{{{m}\upsilon^{{{2}}}}}{{{r}}}={m}{g}$$
$$\therefore\upsilon=\sqrt{{{r}{g}}}=\sqrt{{\frac{{{20}}}{{{100}}}\times{9.8}}}=\sqrt{{{1.96}}}={1.4}{m}/{s}$$
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