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OpenStudy (anonymous):
The intensity I of light bulb varies inversely as the square of the distance d from the light bulb. Suppose I is 250 w/m^2 when the distance is 5 m. How much farther would it be to a point where the intensity is 40 w/m^2?
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OpenStudy (anonymous):
\[250/40 = d^{2}/(5m)^{2}\]Solve for d
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