1
IIT-JEE 2008 Paper 2 Offline
+3
-1

A uniform thin cylindrical disk of mass M and radius R is attached to two identical massless springs of spring constant $$k$$ which are fixed to the wall as shown in the figure. The springs are attached to the axle of the disk symmetrically on either side at a distance d from its centre. The axle is massless and both the springs and the axle are in a horizontal plane. The unstretched length of each spring is L. The disk is initially at its equilibrium position with its centre of mass (CM) at a distance L from the wall. The disk rolls without slipping with velocity $${\overrightarrow V _0} = {V_0}\widehat i$$. the coefficient of friction is $$\mu$$. The centre of mass of the disk undergoes simple harmonic motion with angular frequency $$\omega$$ equal to:

A
$$\sqrt {{k \over M}}$$
B
$$\sqrt {{{2k} \over M}}$$
C
$$\sqrt {{{2k} \over {3M}}}$$
D
$$\sqrt {{{4k} \over {3M}}}$$
2
IIT-JEE 2008 Paper 2 Offline
+3
-1

A uniform thin cylindrical disk of mass M and radius R is attached to two identical massless springs of spring constant $$k$$ which are fixed to the wall as shown in the figure. The springs are attached to the axle of the disk symmetrically on either side at a distance d from its centre. The axle is massless and both the springs and the axle are in a horizontal plane. The unstretched length of each spring is L. The disk is initially at its equilibrium position with its centre of mass (CM) at a distance L from the wall. The disk rolls without slipping with velocity $${\overrightarrow V _0} = {V_0}\widehat i$$. the coefficient of friction is $$\mu$$. The maximum value of V$$_0$$ for which the disk will roll without slipping is:

A
$$\mu g\sqrt {{M \over k}}$$
B
$$\mu g\sqrt {{M \over {2k}}}$$
C
$$\mu g\sqrt {{{3M} \over k}}$$
D
$$\mu g\sqrt {{{5M} \over {2k}}}$$
3
IIT-JEE 2008 Paper 1 Offline
+3
-1

STATEMENT - 1 :

Two cylinders, one hollow (metal) and the other solid (wood) with the same mass and identical dimensions are simultaneously allowed to roll without slipping down an inclined plane from the same height. The hollow cylinder will reach the bottom of the inclined plane first.

and

STATEMENT - 2 :

By the principle of conservation of energy, the total kinetic energies of both the cylinders are identical when they reach the bottom of the incline.

A
Statement - 1 is True, Statement - 2 is True; Statement - 2 is a correct explanation for Statement - 1
B
Statement - 1 is True, Statement - 2 is True; Statement - 2 is NOT a correct explanation for Statement - 1
C
Statement - 1 is True, Statement - 2 is False
D
Statement - 1 is False, Statement - 2 is True
4
IIT-JEE 2007 Paper 2 Offline
+3
-1

A small object of uniform density rolls up a curved surface with an initial velocity $$v$$. It reaches up to a maximum height of $$\frac{3 v^{2}}{4 g}$$ with respect to the initial position. The object is A
ring
B
solid sphere
C
hollow sphere
D
disc
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