Question: The load L that a helical spring can support varies directly as the cube of its wire diameter d and inversely as its coil diameter

The load L that a helical spring can support varies directly as the cube of its wire diameter d and inversely as its coil diameter D. A spring for which d = 0.120 in. and D = 0.953 in. can support 45.0 lb. What is the coil diameter of a similar spring that supports
78.5 lb and for which d = 0.156 in.?

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