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Air flowing through a tube of 75-mm diameter passes over a 150-mm-long roughened section that is constructed from naphthalene having the properties -4 flow rate and the average mixed outlet temperature to analyze the performance of the average (50 µ,m) diameter channel and concludes that flow rates and heat transfer coefficients are increased and decreased, respectively, by about 5% when forced convection occurs in microchannels. M = 128.16 kg/kmol and psat(300 K) = 1.31 X 10 bar.
Comment on the validity of the experimentalist's conclusion.
a disk is spinning on shaft ab and rotates at an angular velocity w215 revs with respect to shaft ab. shaft ab is
A constant-volume tank contains 10 lbm of ammonia initially at 30 lbf/in^2 and 80(deg)F (539.67(deg)R). The ammonia is then cooled until its pressure drops to 10 lbf/in^2. Determine its entropy change from the initial state to the final state.
consider a 1-cm-diameter and 0.3-m-long copper rod kcopper 400 wm-k with its ends fixed to two parallel surfaces. the
a tool chest has 980 n weight that acts through the midpoint of the chest. the chest is supported by feet at a and
a compressor receives air at 95kpa and 250c at low velocity. at the exit of the compressor air discharges at 1.52mpa
in an article on tire maintenance it is stated that tires lose air over time and pressure losses as high as 90 kpa 13
Evaluate the effect of the water spray on efficiency (net work out divided by heat input) and net power out per kg/s of dry air coming into the turbine.
Water vapor enters a valve with a mass flow rate of 1 kg/s at a temperature of 260°C and a pressure of 3.5 MPa, and undergoes a throttling process to 2.75 MPa. (T0 = 25°C, P0 = 100 kPa)
determine the concentration of carbon in an iron-carbon alloy for which the microstructure consists of proeutectoid
two steel compression coil springs are to be nested. the outer spring as an inside diameter of 1.5 in a wire diameter
a seesaw is 20 feet long with a fulcrum at the center. three children want to get on at the same time. the masses of
The ladder has a uniform weight of 80 lb and rests against the smooth wall at B. If the coefficient of static friction at A is mu(a)= 0.4, determine if the ladder will slip. Take theta= 60 deg
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