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Physics, 22.06.2019 22:50, mdg5605
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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Match each type of lever with the correct diagram. 1. first-class 2. third-class 3. second-class
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The researcher who studied the ability of cats to learn to escape from puzzle boxes was
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