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#7 | Mechanical Energy

(Physics) > Work,Energy and Power

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A mass *m* slips along the wall of a semispherical surface of radius *R*. The velocity at the bottom of the surface is [** MP PMT 1993]**

(1) $\sqrt{Rg}$

(2) $\sqrt{2Rg}$

(3) $2\sqrt{\pi Rg}$

(4) $\sqrt{\pi Rg}$

PMT - 1993

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Three different objects of masses ${m}_{1},{m}_{2}$ and *m*_{3} are allowed to fall from rest and from the same point ‘*O*’ along three different frictionless paths. The speeds of the three objects, on reaching the ground, will be in the ratio of

(1) ${m}_{1}:{m}_{2}:{m}_{3}$

(2) ${m}_{1}:2{m}_{2}:3{m}_{3}$

(3) 1 : 1 : 1

(4) $\frac{1}{{m}_{1}}:\frac{1}{{m}_{2}}:\frac{1}{{m}_{3}}$

AIIMS - 2002

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Which of the following graph depicts spring constant *k* versus length *l *of the spring correctly

(1) | |

(2) | |

(3) | |

(4) |

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