Using the figure below and the fact that it takes $7\mathrm{.}1{10}^{-12}J$ to raise the potential of the inner axon wall to $+30$ mV from $-70$ mV and another $4\mathrm{.}0{10}^{-11}J$ to restore the inner wall of the axon to $-70$ mV from $+30$ mV $,$ find the power supplied to the axon per action potential.

Your response is within $10\%$ of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four$-$digit accuracy to minimize roundoff error. nW

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$(1)$

$10.$

SERCP$1118.$A$.$P$.054.$

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The resistance between points a and $b$ in the figure below drops to two$-$thirds its original value when switch $S$ is closed. Determine the value of $R.$

$R=$

Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully, $$

Answer both problems please.