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A minivan traveling 90 km/h has just passed through a thunderstorm that left a film of water 0.1 mm thick on the top of the van. The top of the van can be assumed to be a flat plate 6 m long. Assume isothermal condi- tions at 27°C, an ambient air relative humidity of 80%, and turbulent flow over the entire surface. What loca- tion on the van top will be the last to dry? What is the water evaporation rate per unit area (kg/s · m2) at the trailing edge of the van top?
a mixture having a molar analysis of 66 n2 17 co2 and 17 h2o enters a turbine at 1000 k 8 bar with a mass flow rate of
a cylinderical specimen made of annealed 4135 steel with k equal to 150000 lbin2 and n equal to 0.27 has a diameter of
a helium gas is heated at constant volume from 100kpa 300k kelvin to 500k. a following process expands the gas at
If we have |N|(en) + F - W = 0 Where The unit vector of N is give, F components unknown and W is only -3400 j. What is the first step to solve for an unknown.
a file cabinet weighing 230lb is being pushed to the right with a horizontal force p applied a distance h from the
the wear resistance of a steel shaft is to be improved by nitrogen hardening of its surface. the initial nitrogen
a calculate the percentage volume change for a material being transformed from fcc to bcc. remember to assume the
a gate having a cross section as shown an opening 5 ft wide and 4ft high. the weights 400 lbs and its center of gravity
water at 50 degrees farheneit and 50 psia is heated in a chamber by mixing it with saturated water vapor at 50 psia. if
An isolated system consists of a closed copper vessel of mass 0.1 kg, containing 1 kg of liquid water, each initially at 5°C, immersed in 20 kg of liquid water, initially at 20°C. The system is allowed to come to equilibrium. Determine the final temp..
an aluminum transmission line with a diameter of 20mm has an electrical resistance of r 2.636x10-4 ohmsm and carries
The main bearing on an engine crankshaft is lubricated with engine oil. The torque due to friction T0 depends on shaft diameter D, rotational speed, lubricated viscosity, and density. Use dimensional analysis to derive an expression for torque.
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