Killer Revision Of Rotation In 45 Minutes

Quick Revision - Rotation

A tank can be filled in 30 minutes. There is a leakage which can empty the tank in 90 minutes. Therefore, the tank will be filled in A. 60 minutes B. 45 minutes C. 55 minutes D. 50 minutes

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The rotation undergone by the minute hand of a clock as it traverses a distance of 255 minutes is :

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A rigid body is rotating about a vertical axis at n rotations per minute, If the axis slowly becomes horizontal in t seconds and the body keeps on rotating at n rotations per minute then the torque acting on the body will be, if the moment of inertia of the body about axis of rotation is I.

The half life period of a radioactive material is 15 minutes. What percent will remain after 45 minutes ?