ANGULAR MOMENTUM \& CONSERVATION OF ANGULAR MOMENTUM
Rotational Motion

269637 A smooth uniform rod of length \(L\) and mass \(M\) has two identical beads of negligible size, each of mass \(m\), which can slide freely along the rod. Initially the two beads are at the centre of the rod and the system is rotating with angular velocity \(\omega_{0}\) about its axis perpendicular to the rodand passing through its mid point (see figure). There are no external forces. When the beads reach the ends of the rod, the angular velocity of the system is
\([\) [

1 \(\frac{M \omega_{0}}{M+3 m}\)
2 \(\frac{M \omega_{0}}{M+6 m}\)
3 \(\frac{(M+6 m) \omega_{0}}{M}\)
4 \(\omega_{0}\)
Rotational Motion

269638 A uniform circular disc of mass \(M\) and radius \(R\) rolls without slipping on a horizontal surface. If the velocity of its centre is \(v_{\mathbf{0}}\), then the total angular momentum of the disc about a fixed point \(P\) at a height \(3 R / 2\) above the centre \(C\).

1 increase continuously as the disc moves away
2 decrease continuously as the disc moves away
3 is always equal to \(2 \mathrm{MRv}_{0}\)
4 is always equal to \(\mathrm{MRv}_{0}\)
Rotational Motion

269639 A disc of mass \(m\) and radius \(R\) moves in the \(\mathrm{X}-\mathrm{Y}\) plane as shown in figure. The angular momentum of the disc about the origin \(O\) at the instant shown is

1 \(-\frac{5}{2} m R^{2} \omega k\)
2 \(\frac{7}{3} m R^{2} \omega k\)
3 \(-\frac{9}{2} m R^{2} \omega k\)
4 \(\frac{5}{2} m R^{2} \omega k\)
Rotational Motion

269640 A uniform sphere of mass \(m\), radius \(r\) and moment of inertia I about its centre of mass axis moves along the \(x\)-axis is shown in figure. Its centre of mass moves with velocity \(\mathbf{v}_{0}\),and it rotates about its centre of mass with angular velocity \(\omega_{0}\). Let \(L=\left(I \omega_{0}+m v_{0} r\right)(-k)\). The angular momentum of the body about the the origin \(O\) is

1 \(\mathrm{L}\), only if \(\mathrm{v}_{0}=\omega_{0} r\)
2 greater than \(L, v_{0}\lt \omega_{0} r\)
3 less than \(L\), if \(\mathrm{v}_{0}\lt \omega_{0} r\)
4 \(\mathrm{L}\), for all value of \(\mathrm{v}_{0}\) and \(\omega_{0}\)
Rotational Motion

269637 A smooth uniform rod of length \(L\) and mass \(M\) has two identical beads of negligible size, each of mass \(m\), which can slide freely along the rod. Initially the two beads are at the centre of the rod and the system is rotating with angular velocity \(\omega_{0}\) about its axis perpendicular to the rodand passing through its mid point (see figure). There are no external forces. When the beads reach the ends of the rod, the angular velocity of the system is
\([\) [

1 \(\frac{M \omega_{0}}{M+3 m}\)
2 \(\frac{M \omega_{0}}{M+6 m}\)
3 \(\frac{(M+6 m) \omega_{0}}{M}\)
4 \(\omega_{0}\)
Rotational Motion

269638 A uniform circular disc of mass \(M\) and radius \(R\) rolls without slipping on a horizontal surface. If the velocity of its centre is \(v_{\mathbf{0}}\), then the total angular momentum of the disc about a fixed point \(P\) at a height \(3 R / 2\) above the centre \(C\).

1 increase continuously as the disc moves away
2 decrease continuously as the disc moves away
3 is always equal to \(2 \mathrm{MRv}_{0}\)
4 is always equal to \(\mathrm{MRv}_{0}\)
Rotational Motion

269639 A disc of mass \(m\) and radius \(R\) moves in the \(\mathrm{X}-\mathrm{Y}\) plane as shown in figure. The angular momentum of the disc about the origin \(O\) at the instant shown is

1 \(-\frac{5}{2} m R^{2} \omega k\)
2 \(\frac{7}{3} m R^{2} \omega k\)
3 \(-\frac{9}{2} m R^{2} \omega k\)
4 \(\frac{5}{2} m R^{2} \omega k\)
Rotational Motion

269640 A uniform sphere of mass \(m\), radius \(r\) and moment of inertia I about its centre of mass axis moves along the \(x\)-axis is shown in figure. Its centre of mass moves with velocity \(\mathbf{v}_{0}\),and it rotates about its centre of mass with angular velocity \(\omega_{0}\). Let \(L=\left(I \omega_{0}+m v_{0} r\right)(-k)\). The angular momentum of the body about the the origin \(O\) is

1 \(\mathrm{L}\), only if \(\mathrm{v}_{0}=\omega_{0} r\)
2 greater than \(L, v_{0}\lt \omega_{0} r\)
3 less than \(L\), if \(\mathrm{v}_{0}\lt \omega_{0} r\)
4 \(\mathrm{L}\), for all value of \(\mathrm{v}_{0}\) and \(\omega_{0}\)
Rotational Motion

269637 A smooth uniform rod of length \(L\) and mass \(M\) has two identical beads of negligible size, each of mass \(m\), which can slide freely along the rod. Initially the two beads are at the centre of the rod and the system is rotating with angular velocity \(\omega_{0}\) about its axis perpendicular to the rodand passing through its mid point (see figure). There are no external forces. When the beads reach the ends of the rod, the angular velocity of the system is
\([\) [

1 \(\frac{M \omega_{0}}{M+3 m}\)
2 \(\frac{M \omega_{0}}{M+6 m}\)
3 \(\frac{(M+6 m) \omega_{0}}{M}\)
4 \(\omega_{0}\)
Rotational Motion

269638 A uniform circular disc of mass \(M\) and radius \(R\) rolls without slipping on a horizontal surface. If the velocity of its centre is \(v_{\mathbf{0}}\), then the total angular momentum of the disc about a fixed point \(P\) at a height \(3 R / 2\) above the centre \(C\).

1 increase continuously as the disc moves away
2 decrease continuously as the disc moves away
3 is always equal to \(2 \mathrm{MRv}_{0}\)
4 is always equal to \(\mathrm{MRv}_{0}\)
Rotational Motion

269639 A disc of mass \(m\) and radius \(R\) moves in the \(\mathrm{X}-\mathrm{Y}\) plane as shown in figure. The angular momentum of the disc about the origin \(O\) at the instant shown is

1 \(-\frac{5}{2} m R^{2} \omega k\)
2 \(\frac{7}{3} m R^{2} \omega k\)
3 \(-\frac{9}{2} m R^{2} \omega k\)
4 \(\frac{5}{2} m R^{2} \omega k\)
Rotational Motion

269640 A uniform sphere of mass \(m\), radius \(r\) and moment of inertia I about its centre of mass axis moves along the \(x\)-axis is shown in figure. Its centre of mass moves with velocity \(\mathbf{v}_{0}\),and it rotates about its centre of mass with angular velocity \(\omega_{0}\). Let \(L=\left(I \omega_{0}+m v_{0} r\right)(-k)\). The angular momentum of the body about the the origin \(O\) is

1 \(\mathrm{L}\), only if \(\mathrm{v}_{0}=\omega_{0} r\)
2 greater than \(L, v_{0}\lt \omega_{0} r\)
3 less than \(L\), if \(\mathrm{v}_{0}\lt \omega_{0} r\)
4 \(\mathrm{L}\), for all value of \(\mathrm{v}_{0}\) and \(\omega_{0}\)
Rotational Motion

269637 A smooth uniform rod of length \(L\) and mass \(M\) has two identical beads of negligible size, each of mass \(m\), which can slide freely along the rod. Initially the two beads are at the centre of the rod and the system is rotating with angular velocity \(\omega_{0}\) about its axis perpendicular to the rodand passing through its mid point (see figure). There are no external forces. When the beads reach the ends of the rod, the angular velocity of the system is
\([\) [

1 \(\frac{M \omega_{0}}{M+3 m}\)
2 \(\frac{M \omega_{0}}{M+6 m}\)
3 \(\frac{(M+6 m) \omega_{0}}{M}\)
4 \(\omega_{0}\)
Rotational Motion

269638 A uniform circular disc of mass \(M\) and radius \(R\) rolls without slipping on a horizontal surface. If the velocity of its centre is \(v_{\mathbf{0}}\), then the total angular momentum of the disc about a fixed point \(P\) at a height \(3 R / 2\) above the centre \(C\).

1 increase continuously as the disc moves away
2 decrease continuously as the disc moves away
3 is always equal to \(2 \mathrm{MRv}_{0}\)
4 is always equal to \(\mathrm{MRv}_{0}\)
Rotational Motion

269639 A disc of mass \(m\) and radius \(R\) moves in the \(\mathrm{X}-\mathrm{Y}\) plane as shown in figure. The angular momentum of the disc about the origin \(O\) at the instant shown is

1 \(-\frac{5}{2} m R^{2} \omega k\)
2 \(\frac{7}{3} m R^{2} \omega k\)
3 \(-\frac{9}{2} m R^{2} \omega k\)
4 \(\frac{5}{2} m R^{2} \omega k\)
Rotational Motion

269640 A uniform sphere of mass \(m\), radius \(r\) and moment of inertia I about its centre of mass axis moves along the \(x\)-axis is shown in figure. Its centre of mass moves with velocity \(\mathbf{v}_{0}\),and it rotates about its centre of mass with angular velocity \(\omega_{0}\). Let \(L=\left(I \omega_{0}+m v_{0} r\right)(-k)\). The angular momentum of the body about the the origin \(O\) is

1 \(\mathrm{L}\), only if \(\mathrm{v}_{0}=\omega_{0} r\)
2 greater than \(L, v_{0}\lt \omega_{0} r\)
3 less than \(L\), if \(\mathrm{v}_{0}\lt \omega_{0} r\)
4 \(\mathrm{L}\), for all value of \(\mathrm{v}_{0}\) and \(\omega_{0}\)