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Help with RC circuits. I found the time constant. But how do I find the current through the battery in 20.81 seconds? Difference between Contribute to + infinite form and Contribute to + gerund form? What flow rate must the pump be capable of producing? with 80 gpm, 40 psi, sch40 pvc, piping distance is 1350 ft.? How can I find the equation of the tangent for the curve y=e^x/lnx where it intersects with the curve of y=e^x? If a dune move 40 meter per year how far does it move in 1 day?