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1. Air at 25°C and 1 atm is flowing over a long flat plate with a velocity of 8 m/s. Determine the distance from the leading edge of the plate where the flow becomes turbulent, and the thickness of the boundary layer at that location.
2. A transformer that is 10 cm long, 6.2 cm wide, and 5 cm high is to be cooled by attaching a 10 cm x 6.2 cm wide polished aluminium heat sink (emissivity = 0.03) to its top surface. The heat sink has seven fins, which are 5 mm high, 2 mm thick, and 10 cm long. A fan blows air at 25°C parallel to the passages between the fins. The heat sink is to dissipate 20 W of heat and the base temperature of the heat sink is not to exceed60°C. Assuming the fins and the base plate to be nearly isothermal and the radiation heat transfer to be negligible, determine the minimum free-stream velocity the fan needs to supply to avoid overheating.
a rigid well insulated container is outfitted with a moveable but frictionless partition that separates two sides but
Consider a saturated clay layer of 4 m thickness on top of a deep layer of stiff sand. The clay has an initial porosity n=40%. Following a lowering of the water level in the clay, the clay porosity is reduced to 30%. What is the change of thickness S..
A 40 mm diameter hole is drilled 3 m deep into the steel shaft. When the two torque are applied, determine (a) the maximum shear stress in the shaft: and (b) the angle of rotation of the free end of the shaft. Use G= 83GPa for steel.
an pumping system used for irrigation that takes water at a rate of 15 lbms from a well at 65 f and standard
rod bde is partially guided by a roller at d which moves in a vertical track. knowing that the instant shown the
A 90-N force is applied to the control rod AB as shown. Knowing that the length of the rod is 225 mm, determine the moment of the force about point B by resolving the force into horizontal and vertical components.
a very wide sheet of 7075-t651 aluminum plate 8mm thick is found to have a single-edge through-the-thickness crack 25
a force of 3 n stretches a spring by 1 m. a mass of 4 kg is attached to the spring. at t0 thenbspmass is pulled down a
what type of feedback data should we be collecting; in order to make sure that our MPS data, our MRP data, our Aggregate Planning, etc. are all correct?
a 0.1-m3 rigid tank contains steam initially at 500 kpa and 200 c. if the temperature in the tank is lowered to 50 c
an aircraft is slowed after landing by dual parachutes deployed from the rear. each parachute is 3.66m in diameter. the
saturated water vapor at 60degc has its pressure decreased to increase the volume by 10 keeping the temperature
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