Recent content by Robert S

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    Graduate Recent Noteworthy Physics Papers

    Almost forgot this one :) Brendan McMonigal et al., "Alcubierre warp drive: On the matter of matter", Phys. Rev. D 85, 064024 (2012) Abstract: The Alcubierre warp drive allows a spaceship to travel at an arbitrarily large global velocity by deforming the spacetime in a bubble around the...
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    Graduate Recent Noteworthy Physics Papers

    Parthiban Santhanam et al., "Thermoelectrically Pumped Light-Emitting Diodes Operating above Unity Efficiency", Phys. Rev. Lett. 108, 097403 (2012) Abstract: A heated semiconductor light-emitting diode at low forward bias voltage V<kBT/q is shown to use electrical work to pump heat from the...
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    Finding q(t) on a capacitor in an RC circuit

    I didn't realize I could differentiate one equation to get a new one. Thanks! :-)
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    Finding q(t) on a capacitor in an RC circuit

    The following circuit is given: [PLAIN]http://img822.imageshack.us/img822/6369/image2lz.jpg Switch S is closed until the charge q2 on C2 reaches its maximum, then at t=0 the switch is opened. Find q1(t). Using Kirchkoff's rules I found: EMF= (q1)/(C1+I2R I2R= q2/C2 I1= I2+I3 In order to...