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A turntable that turns 10 revolutions each second is locatedon top of a mountain. Mounted on the turntable is a laser thatemits a bright beam of light. As the turntable and laser rotate,the beam also rotates and sweeps across the sky. On a dark nightthe beqam reaches some clouds 10 km away.

a) show that the spot of laser light sweeps across teh cloudsat a speed 628 km/s

b) how fast does the spot of laser light sweep across cloudsthat are twice as far away?

c) at what distance will the laser beam sweep across the skyat the speed of light? (speed of light is 300 000 km/s.)

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