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In the following drawing, in order for the lever to balance, blank must be equal to F 2 times D 2
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The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?
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In the following drawing, in order for the lever to balance, blank must be equal to F 2 times D 2...
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