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8. The 8 1b block is attached to a vertical rod by means of two cords. When the system rotates about the axis of the

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8. The 8 1b block is attached to a vertical rod by means of two cords. When the system rotates about the axis of the rod the cords are extended as shown in the figure. (a) How many revolutions per minute must the system make in order that the tension in the upper cord be 15 1b? (b) What then is the tension in the lower cord? 5 ft 8 ft 8 Ib 5 ft

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