A body is uniformly rotating about an axis fixed in an inertial frame of reference. Let A be a unit vector along the axis of rotation
A body is uniformly rotating about an axis fixed in an inertial frame of reference. Let A be a unit vector along the axis of rotation and B be the unit vector along the resultant force on a particle P of the body away from the axis. The value of A . B is
(a) 1
(b) -1
(c) 0
(d) none of these.
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(c) 0
Explanation:
Since the body is uniformly rotating, the resultant force on the particle P will be in the radial direction. So again the directions of A and B will be perpendicular to each other. Hence A.B = |A|.|B|.Cos90° =0.
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