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A blu-ray drive has a maximum speed of 10,000 revolutions per minute. if a blu-ray disc

a blu-ray drive has a maximum speed of 10,000 revolutions per minute. if a blu-ray disc has a diameter of 12 cm, what is the linear speed, in km/h, of a point 4 cm from the center if the disc is spinning at a rate of 8000 revolutions per minute?