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.
0157 
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.
2819 
As shown in Fig. P2.44, the 6inthick 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
1470 
As shown in Fig. P2.45, an oven wall consists of a 0.25inthick 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
1491 
As shown in Fig.P1.41m, air is contained in a vertical pistoncylinder 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
1364 
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 Utube manometer
22365 
As shown in fig.P1.55, a small diameter water pipe passes through the 6inthick 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.
0141 
As shown in Fig.P2.39, a steel wire suspended vertically having a crosssection 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=(XX0)/X0, and x is the stretched length
0303 
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.
0114 
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.
0141