Centrifuge acceleration. A centrifuge rotor is accelerated for 30 s from rest to 20,000 rpm (revolutions per minute). (a) What is its average angular acceleration? (b) Through how many revolutions has the centrifuge rotor turned during its acdeleration period, assuming constant angular acceleration? APPROACH To determine a = Ao/At, we need the initial and final angular velocities. For (b), we use Eqs. 8-9 (recall that one revolution corresponds to 0= 27 rad). %3D

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.