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An illuminated object is 20 cm from the center of a convex lens. A focused image is formed on a screen 100 cm from the lens. What is the focal length of the lens?
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Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd a) 30 joules b) 3000 joules c) 320 joules d) 3200 joules
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An illuminated object is 20 cm from the center of a convex lens. A focused image is formed on a scre...
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