A fan rotating at 90 rpm. It is then switched OFF. It stops after 21 revolutions . Calulate the time taken by it stop assuming that the frictional trouqe is constant.
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Physics is the natural science that studies matter, its motion and behavior through space and time, and the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves.
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