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1-56) can be used. To discuss the capacitance of a pressure vessel, we first write a flow law for the pressure vessel of Fig. 1-42, thus w=z P~df- (kg/sec) (1 -64) The gas capacitance is defined as the ratio of change of weight of gas in the vessel to the change in pressure, C = dV v % <-fl (1-65) By combining this expression i with Eq. (1-64) we have that w= dt (kg/sec) (1-66) The capacitance expression in Eq. (1-65) must be calculated from thermodynamic relations because the gas expands from a region of high pressure into the vessel at lower pressure, or perhaps expands from the vessel into a region of lower pressure.

1-53) This expression is given schematic representation in Fig. 1-39. Here, as for the rigid linkage and the gear train, a rigid constraint is imposed by the transformer on the through and the across variables. ^ - ^ Fig. 1-39. -*— f Schematic representation of rack and pinion. 1-c 1-18 1:27777r/A/p FLUID ELEMENTS LIQUID SYSTEMS Liquid systems are composed of liquid-filled tanks or vessels that are connected by pipes, tubes, orifices and other flow-restricting devices. The analysis of such systems must proceed, of course, by using the funda­ mental laws that govern the flow of liquids.

The voltage-charge characteristic of a capacitor is given graphically in accompanying sketch. Problems 57 a. Determine the capacitance of the capacitor. b. How much energy is stored in the electric field of the capacitor, if it is charged to 103 volts? 1-2. 8. Alternate sheets of foil are connected together to form two intermeshed electrically insulated stacks. 6 sq. in. Determine the capacitance of this capacitor. 1-3. The B-H curve of a given ferromagnetic material, neglecting hysteresis, is illustrated.

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