Astronomers are comparing two stars that are known to have the same luminosity. Star A is observed to be 4 times brighter than s
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First of all, we need to convert the angular speed from rev/min into rev/s:
The angular acceleration is the variation of angular speed divided by the time:
And this is constant, so we can use the following equation to calculate the angle through which the engine has rotated:
so, 5 revolutions.