NEET-XII-Physics
10: Rotational Mechanics
- #2A body is uniformly rotating about an axis fixed in an inertial frame of reference. Let
→Abe a unit vector along the axis of rotation and
→Bbe the unit vector along the resultant force on a particle P of the body away from the axis. The value of
→A . →Bis
(a) 1
(b) -1
(c) 0
(d) none of these.digAnsr: cAns : (c) 0
The unit vector along the axis of rotation and the unit vector along the resultant force on the particle are perpendicular to each other in a uniform rotation.
Therefore, we have:
`` \stackrel{\to }{A}.\stackrel{\to }{B}=0``
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