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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.
the entire assembly is placed in an environment whose temperature is 200c. determine the volume of chamber 1 when thermodynamic equillibrium has been estabilished.
a transparent rigid container is filled with 2 gallons of water. initially the pressure is measured to be 10.2 psig
Knowing that the pipe has inner and outer dimensions equal to 35 and 42 mm, respectively, detemine the normal and shearing stresses at point a and point b.
trees at the bottom of a lake are approximated as a truncated cone with a base diameter of 6 ft a top diameter of 1 ft
the allowable shearing stress is 15ksi in a steel rod ab and 8ksi in a brass rod bc. knowing that a torque of magnitude
calculate the energy requirement to heat 100 lb water from 100 f to 90 c in btu. if an electrical heating element is
a 12-mm diameter jet of water discharges vertically into the atmosphere. due to surface tension the pressure inside the
The magnitude of the horizontal(to the right) for F1 is 5kN and F1 + F2 + F3 = 0. What are the magnitude of F2 and F3?
the blade assembly of an oscillating fan rotates with a constant angular velocity w1 -360rpm i with respect to the
consider the steady operation of a refrigeration package for a shipping container on a train truck or ship. the package
A 25-g bullet is traveling with a velocity of 425 m/s when it impacts and becomes embedded in 2.5 kg wooden block. The block can move vertically without friction. Determine a) the velocity of the bullet and block immediately after impact,
If the efficiency of the turbine in converting the mechanical energy given up by the fluid to the turbine shaft is 89% (nt = 0.89), calculate the friction loss in the turbine in J/kg.
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