Find the ratio of the densities
Two wires are kept tight between the same pair of supports. The tensions in the wires are in the ratio 4:1, the radii are in the ratio 2:1. If the ratio of the fundamental frequencies 4:9 then find the ratio of the densities.
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Assume that the aluminum wire has a rectangular cross section. The resistivity of aluminum is 2.82 x 10-8Ω-m
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The shelf life of a battery produced by one major company is known to be normally distributed, with a mean life of 3.5 years and a standard deviation of 0.75 years. What is the upper quartile of battery shelf life?
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