Let \(\overrightarrow A\) be a unit vector along the axis of rotation of a purely rotating body and \(\overrightarrow B\) be a unit vector along the velocity of a particle P of the body away from the axis. The value of \(\overrightarrow A.\overrightarrow B\) is:
1. \(1\)
2. \(-1\)
3. \(0\)
4. None of these
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA particle moves with a constant velocity parallel to the X-axis. Its angular momentum with respect to the origin:
1. | is zero | 2. | remains constant |
3. | goes on increasing | 4. | goes on decreasing |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA thin circular ring of mass \(M\) and radius \(r\) is rotating about its axis with an angular speed \(\omega\). Two particles having mass \(m\) each are now attached at diametrically opposite points. The angular speed of the ring will become:
1. \(\frac{\omega M}{M+m}\)
2. \(\frac{\omega M}{M+2 m}\)
3. \(\frac{\omega(M-2 m)}{M+2 m}\)
4. \(\frac{\omega(M+2 m)}{M}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA person sitting firmly over a rotating stool has his arms stretched. If he folds his arms, his angular momentum about the axis of rotation:
1. | increases | 2. | decreases |
3. | remains unchanged | 4. | doubles |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA particle moves on a straight line with a uniform velocity. Its angular momentum:
(a) | is always zero. |
(b) | is zero about a point on the straight line. |
(c) | is not zero about a point away from the straight line. |
(d) | about any given point remains constant. |
Choose the correct option:
1. | (a), (b) and (c) | 2. | (a), (b) and (d) |
3. | (b), (c) and (d) | 4. | none of these |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf there is no external force acting on a non-rigid body which of the following quantities must remain constant?
a. | angular momentum |
b. | linear momentum |
c. | kinetic energy |
d. | moment of inertia |
1. | (a) and (b) |
2. | (b) and (c) |
3. | (c) and (d) |
4. | (a) and (d) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology