Differential form of the helmholtz free energy
The differential of thermal energy of a surface of a liquid with surface tension y and area A may be written as dU = Tds + ydA Write down the corresponding differential form of the Helmholtz free energy, F=U-TS.
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The electric potential immediately outside a charged conducting sphere is 180 V, and 10.0 cm farther from the center of the sphere the potential is 140 V. (a) Determine the radius of the sphere. (b) Determine the charge on the sphere.
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