A horizontal bar 1.5 metres long and of small cross-section rotates about

vertical axis through one end. It accelerates uniformly from 1200 r.p.m. to 1500 r.p.m. in an interval

of 5 seconds. What is the linear velocity at the beginning and end of the interval ? What are the normal and tangential components of the acceleration of the mid point of the bar after 5 seconds after the acceleration begins ?

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