Which of the following is incorrect?
None of these
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Concrete mixture is made by mixing cement, stone and sand in a rotating cylindrical drum. If the drum rotates too fast, the ingredients remain stuck to the wall of the drum and proper mixing of ingredients does not take place. The maximum rotational speed of the drum in revolutions per minute (rpm) to ensure proper mixing is close to :
(Take the radius of the drum to be and its axle to be horizontal):
27.0
0.4
1.3
8.0
For just complete rotation
at top point
The rotational speed of the drum
The maximum rotational speed of the drum in revolutions per minute
.
Angular velocity of each particle of a rotating rigid body about axis of rotation is
same
different
depends on relative position
A mass is revolving in a circle which is in the plane of paper. The direction of angular acceleration is
upward the radius
towards the radius
tangential
at right angle to angular velocity
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