By H. K. Messerle

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4a. This field acts as an intermediate storage medium or system, which can be used to throttle the energy flow in either direction, as indicated in Fig. 4b. Electrical source ♦ ' θι Δθ^/Ί Mechanical source dU* Machine (a) FIG. 4. (b) An electrical machine, (a) General arrangement, (b) Energy flow. In the example of a machine we were coupling two sources by a storage medium. This is quite a general situation and can be represented in more general terms, as shown in Fig. 5. The energy enters the FIG.

9. Again, experiments indicate that the piston will move in such a direction as to decrease internal energy. This evidence suggests the minimum energy postulate. Piston ' J FIG. 9. A constrained piston in a cylinder filled with gas. f f J > J f < * Z K r i T 31 3 . POSTULATES Postulate IL If the constraint imposed "on an extensive quantity is relaxed, the extensive quantity takes up a value that minimizes the energy in the system when the constraints on the remaining extensive quantities are maintained.

This factor will become important when considering coupling between various forms, especially when dealing with time dependent processes. , for any intensive quantity y and the associated extensive quantity x the increment becomes dW=ydx. 19) This is an interesting and important statement, since this similarity of all energy relations allows us to deal with all energy conversion processes along the same lines and to develop a general theory. 26 I I . 20) where r0 is the radius of earth, r = r0 + h is the radius reached by the rocket, and h is the level above r0 .

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