ANGULAR MOMENTUM \& CONSERVATION OF ANGULAR MOMENTUM
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Rotational Motion

269469 A mass is whirled in a circular path with a constant angular velocity and its angular momentum is\(\mathrm{L}\). If the length of string is now halved keeping the angular velocity same, the new angular momentum is

1 \(\mathrm{L} / 4\)
2 \(\mathrm{L} / 2\)
3 \(\mathrm{L}\)
4 \(2 \mathrm{~L}\)
Rotational Motion

269470 A disc rotates with angular velocity wand kinetic energy\(E\). Then its angular momentum

1 \(I \omega\)
2 \(L=\frac{E}{\omega}\)
3 \(L=\frac{2 E}{\boldsymbol{\omega}}\)
4 \(L=\frac{\omega}{E}\)
Rotational Motion

269529 A thin uniform circular disc of mass \(M\) and radius \(R\) is rotating in a horizontal plane about an axis perpendicular to the plane at an angular velocity \(\omega\). Another disc of mass\(M\) / 3 but same radius is placed gently on the first disc coaxially. The angular velocity of the system now is

1 \(\frac{4 \omega}{3}\)
2 \(\omega\)
3 \(\frac{3 \omega}{4}\)
4 \(\frac{3 \omega}{8}\)
Rotational Motion

269530 Aturn table is rotating in horizontal plane about its own axis at an angular velocity 90rpm while a person is on the turn table at its edge. If he gently walks to the centre of table by which moment of inertia of system decreases by \(25 \%\), then the time period of rotation of turn table is

1 \(0.5 \mathrm{sec}\)
2 \(1 \mathrm{sec}\)
3 \(1.5 \mathrm{sec}\)
4 \(2 \mathrm{sec}\)
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Rotational Motion

269469 A mass is whirled in a circular path with a constant angular velocity and its angular momentum is\(\mathrm{L}\). If the length of string is now halved keeping the angular velocity same, the new angular momentum is

1 \(\mathrm{L} / 4\)
2 \(\mathrm{L} / 2\)
3 \(\mathrm{L}\)
4 \(2 \mathrm{~L}\)
Rotational Motion

269470 A disc rotates with angular velocity wand kinetic energy\(E\). Then its angular momentum

1 \(I \omega\)
2 \(L=\frac{E}{\omega}\)
3 \(L=\frac{2 E}{\boldsymbol{\omega}}\)
4 \(L=\frac{\omega}{E}\)
Rotational Motion

269529 A thin uniform circular disc of mass \(M\) and radius \(R\) is rotating in a horizontal plane about an axis perpendicular to the plane at an angular velocity \(\omega\). Another disc of mass\(M\) / 3 but same radius is placed gently on the first disc coaxially. The angular velocity of the system now is

1 \(\frac{4 \omega}{3}\)
2 \(\omega\)
3 \(\frac{3 \omega}{4}\)
4 \(\frac{3 \omega}{8}\)
Rotational Motion

269530 Aturn table is rotating in horizontal plane about its own axis at an angular velocity 90rpm while a person is on the turn table at its edge. If he gently walks to the centre of table by which moment of inertia of system decreases by \(25 \%\), then the time period of rotation of turn table is

1 \(0.5 \mathrm{sec}\)
2 \(1 \mathrm{sec}\)
3 \(1.5 \mathrm{sec}\)
4 \(2 \mathrm{sec}\)
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Rotational Motion

269469 A mass is whirled in a circular path with a constant angular velocity and its angular momentum is\(\mathrm{L}\). If the length of string is now halved keeping the angular velocity same, the new angular momentum is

1 \(\mathrm{L} / 4\)
2 \(\mathrm{L} / 2\)
3 \(\mathrm{L}\)
4 \(2 \mathrm{~L}\)
Rotational Motion

269470 A disc rotates with angular velocity wand kinetic energy\(E\). Then its angular momentum

1 \(I \omega\)
2 \(L=\frac{E}{\omega}\)
3 \(L=\frac{2 E}{\boldsymbol{\omega}}\)
4 \(L=\frac{\omega}{E}\)
Rotational Motion

269529 A thin uniform circular disc of mass \(M\) and radius \(R\) is rotating in a horizontal plane about an axis perpendicular to the plane at an angular velocity \(\omega\). Another disc of mass\(M\) / 3 but same radius is placed gently on the first disc coaxially. The angular velocity of the system now is

1 \(\frac{4 \omega}{3}\)
2 \(\omega\)
3 \(\frac{3 \omega}{4}\)
4 \(\frac{3 \omega}{8}\)
Rotational Motion

269530 Aturn table is rotating in horizontal plane about its own axis at an angular velocity 90rpm while a person is on the turn table at its edge. If he gently walks to the centre of table by which moment of inertia of system decreases by \(25 \%\), then the time period of rotation of turn table is

1 \(0.5 \mathrm{sec}\)
2 \(1 \mathrm{sec}\)
3 \(1.5 \mathrm{sec}\)
4 \(2 \mathrm{sec}\)
For More Updates join with Us
Rotational Motion

269469 A mass is whirled in a circular path with a constant angular velocity and its angular momentum is\(\mathrm{L}\). If the length of string is now halved keeping the angular velocity same, the new angular momentum is

1 \(\mathrm{L} / 4\)
2 \(\mathrm{L} / 2\)
3 \(\mathrm{L}\)
4 \(2 \mathrm{~L}\)
Rotational Motion

269470 A disc rotates with angular velocity wand kinetic energy\(E\). Then its angular momentum

1 \(I \omega\)
2 \(L=\frac{E}{\omega}\)
3 \(L=\frac{2 E}{\boldsymbol{\omega}}\)
4 \(L=\frac{\omega}{E}\)
Rotational Motion

269529 A thin uniform circular disc of mass \(M\) and radius \(R\) is rotating in a horizontal plane about an axis perpendicular to the plane at an angular velocity \(\omega\). Another disc of mass\(M\) / 3 but same radius is placed gently on the first disc coaxially. The angular velocity of the system now is

1 \(\frac{4 \omega}{3}\)
2 \(\omega\)
3 \(\frac{3 \omega}{4}\)
4 \(\frac{3 \omega}{8}\)
Rotational Motion

269530 Aturn table is rotating in horizontal plane about its own axis at an angular velocity 90rpm while a person is on the turn table at its edge. If he gently walks to the centre of table by which moment of inertia of system decreases by \(25 \%\), then the time period of rotation of turn table is

1 \(0.5 \mathrm{sec}\)
2 \(1 \mathrm{sec}\)
3 \(1.5 \mathrm{sec}\)
4 \(2 \mathrm{sec}\)
NEET DIGITAL LIBRARY