Recent content by Mek8388

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    What Is the Focal Length of a Flat Glass Lens?

    What is the focal length of a thin, flat piece of glass with no curvature? I found that the power is 0 diopters, but I don't know what the focal length is.
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    How Many Electrons Are Removed from a Charged Copper Ball?

    Homework Statement A 3.0mm-diameter copper ball is charged to 50nC.What fraction of its electrons have been removed? The density of copper is 8900kgm^3. Homework Equations d=m/v; v=4/3* pi r^3 The Attempt at a Solution I worked through it and got 5.682 E -16, but that answer was...