A circular disc of radius R and thickness R/6 has moment of inertia I about an axis passing through its centre and perpendicular to tis plane. It is melted and recasted into a solid sphere. […]
A uniform rod of length l is placed with one end in contact with the horizontal and is then inclined at an angle α to the horizontal and allowed to fall, without slipping at contact […]
Two discs of same material and thickness have radii 0.2 m and 0.6 m. Their moments of inertia about their axes will be in the ratio
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(a) 1 : 81 (b) 1 […]
A ballet dancer, dancing on smooth floor, is spinning about a vertical axis with her arms folded with an angular velocity of 20 radian/sec. When she stretches her arms fully, the spinning speed decreases to […]
Moment of inertia of a uniform circular disc about a diameter is I. Its moment of inertia about an axis perendicular to its plane and passing throught a point on its rim will be
From a disc of radius R, a concentric circular portion of radius r is cut-out so as to leave an annular disc of mass M. The moment of inertial of this annular disc about the […]
If a gymnast, sitting on a rotating stool with his arms outstretched, suddenly lower his hands, then
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(a) The angular velocity decreases (b) His moment of inertia decreases (c) The angular velocity […]
A small part of the rim of a fly wheel breaks off while it is rotating at a constant angular speed. Then its radius of gyration will
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(a) Increase (b) Decrease (c) Remain […]
A rod of weight W is supported by two parallel knife edge A and B and is in equilibrium, in a horizontal position.The knives are at a distance d from each other.The centre of mass […]
A round disc of moment of inertia i₂ about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia i₁ rotating with an angular velocity […]
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