# physics

A variable-speed drill, initially turning at 150 rpm, speeds up to 1300 rpm in a time interval of 1.0 s. What is its average rotational acceleration?

______rpm/s2

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1. change in rad/s = 1150 revs/min /1s

= 1150 rev/min * 1 min/60 s * 2pi rad/rev /1 s

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