A certain mass stretches one spring foot and another spring foot. The two springs are attached to

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A certain mass stretches one spring foot and another spring foot. The two springs are attached to a common rigid support in the manner described in Problem 13 and Figure 5.1.16. The first mass is set aside, a mass weighing 8 pounds is attached to the double-spring arrangement, and the system is set in motion. If the period of motion is π/15 second, determine how much the first mass weighs.


Problem 13

Figure 5.1.16

k2 20 lb www www

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