dU

The first term dU is essentially the kinetic energy of the molecules in the packet, the second their gravitational potential energy.

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December 29, 2007 at 6:24 am but U need da math to du the physiks

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For non-isolated systems we extend the law as dQ = dU + dW, where dQ is the differential of the amount of heat added to the system (in a reversible manner).

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Now in regions where the gradient is negative dU/dx jae

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Moreover, it is difficult to conceive of a case where marginal user cost associated with an increase in A, i.e. dU/dA, will be other than positive.

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[Q 3] - "dU = δQ − δW" Is this equation valid for closed system only?

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The fundamental equation for U for such a system is dU = TdS + fdL + E • dp (4. 3-1) where E is the electric field strength and p is the dipole moment of the system.

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The funda - mental equation for U for the system considered is dU = TdS - PdV + Σ µidni + XdY (1. 4-1) © 2001 IUPAC, Pure and Applied Chemistry 73, 1349-1380

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The fundamental equation for U for such a system is dU = TdS + fdL + E • dp (4. 3-1) where E is the electric field strength and p is the dipole moment of the system.

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Moreover, it is difficult to conceive of a case where marginal user cost associated with an increase in A, i.e. dU/dA, will be other than positive.

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