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Identify two factors that determine the rate of stream erosion
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One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?
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If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?
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Amira pulls a 3 pound wagon 4 feet. how much work has she done?
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can light cause butterfly’s wings to glow? why or why not and does it matter what kind of light is s...
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