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During an experiment conducted in a room at 25°C, a laboratory assistant measures that a refrigerator that draws 2 kW of power has removed 30,000 kJ of heat from the refrigerated space, which is maintained at -30°C. The running time of the refrigerator during the experiment was 20 min. Determine if these measurements are reasonable.
a group of students is developing a plan to deliver water from a lake to a downhill village. the students plan to use a
a 9 m3 tank has two sections separated by a membrane both of which contain nitrogen gas. the nitrogen in section a has
when drilling a hole in a table leg a furniture maker uses a hand-operated drill with a bit of diameter d4.0mm.a. if
u.s. productivity has improved noticeably in recent years averaging 4 to 5 percent per year while the u.s. economy grew
An adiabatic gas turbine expands air at 1,000kPa and 500C to 100kPa and 150C. Air enters the turbine through 0.200m^2 opening with an average velocity of 40 m/s and exhausts through a 0.910m^2 opening.
you are building a small hydroelectric generator for a hospital in a remote village. the hospital needs approximately
a structural member supports loads which produce at a particular point a direct tensile stress of 80 nmm2 and a shear
Calculate the heat transfer per kilogram of air between sections (1) and (2), and the stagnation pressure at section (2).
consider a steam turbine where steam enters with a pressure of 10 mpa and temperature 500 degc and expands
How many kilograms each of pearlite and the proeutectoid phase form? Schematically sketch and label the resulting microstructure.
Using the standard machining parameter formulae for milling, determine the speed (rpm), feed (ipm) and machining time (TM) recommended to horizontal mill ANSI #1018 cold rolled steel that is 1.50 inch long with a 10 tooth 4.0 inch diameter slab mill ..
the enthalpy of combustion for propane is -2044 kjmol. how many liters of propane at stp must be burned in order to
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