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A round pipe of varying diameter carries petroleum from a wellhead to a refinery. At the wellhead the pipe\'s diameter is 51.3 cm and the flow speed of the petroleum is 12.5 m/s. At the refinery the petroleum flows at 6.87 m/s. What is the volume flow rate of the petroleum along the pipe and what is the pipe\'s diameter at the refinery?
volume flow rate:
________m^3/s
diameter
________cm
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You can launch the proton from the surface of a sphere of with charge Q and radius R, from the center of a ring of charge Q and radius R, or from the center of a disk of charge Q and radius R. Which is the best choice.
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