The 4.00 kg block is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended as shown in the (Figure 1) and the tension in the upper string is 84.0 N. (A) What is the tension in the lower cord? (Express your answer with the appropriate units.) (B) How many revolutions per minute does the system make? (Express your answer in revolutions per minute.)   (C) Find the number of revolutions per minute at which the lower cord just goes slack. (Express your answer in revolutions per minute.)

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