Showing 2171 to 2180 of 4890 Questions
  • As shown in fig 1.7, a manometer is attached to a tank of gas in which the pressure is 104.0 kPa. The manometer liquid is mercury, with a density of 13.59 g/cm3. If g = 9.81 m/s2 and the atmospheric pressure is 101.33 kPa, calculate(a) The difference in mercury levels in the manometer, in cm, (b) The gage pressure of the gas, in kPa.

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    152
  • As shown in Fig. P1.38, an underwater exploration vehicle submerges to a depth of 1000 ft. if the atmospheric pressure at the surface is 1 atm, the water density is 62.4 lb/ft3, and g = 32.2ft/s2, determine the pressure on the vehicle, in atm.

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    785
  • As shown in Fig. P2.44, the 6-in-thick exterior wall of a building has an average thermal conductivity of 0.32Btu/h ∙ ft ∙ oR. At steady state, the temperature of the wall decreases linearly from T1 = 70oF on the inner surface to T2 on the outer surface. The outside ambient air temperature it T0 = 25oF and the convective heat

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    462
  • As shown in Fig. P2.45, an oven wall consists of a 0.25-in-thick layer of steel (ks = 8.7Btu/h ∙ft∙ oR) and a layer of thick (kb = 0.42Btu/h ∙ ft ∙ oR). At steady state, a temperature decrease of 1.2oF occurs over the steel layer. The inner temperature of the steel layer is 540oF occurs over the steel layer. The in

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    461
  • As shown in Fig.P1.41m, air is contained in a vertical piston-cylinder assembly fitted with an electrical resistor. The atmosphere exerts a pressure of 14.lbf/in2 on the top piston, which has a mass of 100 lb and face area of 1 ft2. As electric current passes through the resistor, the volume of the air increases while the piston moves smo

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    326
  • As shown in Fig.P1.46, an inclined manometer is used to measure the pressure of the gas within the reservoir. (a) Using data on the figure, determine the gas pressure, in lbf/in.2 (b) Express the pressure as a gage or a vacuum pressure, as appropriate, in lbf/in.2. (c) What advantage does inclined manometer have over the U-tube manometer

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    2316
  • As shown in fig.P1.55, a small diameter water pipe passes through the 6-in-thick exterior wall of a dwelling. Assuming the temperature varies linearly with position x through the wall from 68°F to 20°F, would the water in the pipe freeze? Explain.

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    135
  • As shown in Fig.P2.39, a steel wire suspended vertically having a cross-section area A and an initial length X0 is stretched by a downward force F applied to the end of the wire. The normal stress in the wire varies linearly according to σ= C ε, where ε is the strain, given by ε=(X-X0)/X0, and x is the stretched length

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    288
  • Assume a balloon material with a constant surface tension of S = 2 N/m. What is the work required to stretch a spherical balloon up to a radius of r = 0.5 m? Neglect any effect from atmospheric pressure.

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    109
  • Assume a cyclic machine that exchanges 6 kW with a 250oC reservoir and has a. Q.L = 0 kW, W. = 6 kW b. Q.L = 6 kW, W. = 0 kW and Q.L is exchanged with a 30oC ambient. What can you say about the processes in the two cases a and b if the machine is a heat engine? Repeat the question for the case of a heat pump.

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    136
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