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The drag characteristics for a newly designed automobile having a maximum characteristic length of 20 ft are to be determined through a model study. The characteristics at both low speed (approximately 20 mph) and high speed (90 mph) are of interest. For a series of projected model tests, an unpressurized wind tunnel that will accommodate a model with a maximum characteristic length of 4 ft is to be used. Determine the range of air velocities that would be required for the wind tunnel if Reynolds number similarity is desired. Are the velocities suitable? Explain.
In a porter governor, the mass of the central load is 18 kg and the mass of each ball is 2 kg. The top arms are 250 mm while the bottom arms are each 300 mm long. The friction of the sleeve is 14 N. If the top arm makes 450 with the axis of rotati..
The power output of an ideal, open-cycle gas turbine cycle is 75 MW and its pressure ratio is 16. Air enters the compressor at 520 R and enters the turbine at 2800 R. Using variable specific heats at 1000°F: cp = 0.263 Btu/lbm-R and k = cp/cv = 1.353..
A vapor-compression heat pump system uses R-134a as the working fluid. The refrigerant enters the compressor at 0.24 Mpa, 0 degrees Celsius, with a volumetric flow rate of 0.6m^3/min. The compression process is adiabatic to 0.9 MPa, 60 degrees Cel..
the pressure and temperature ratios across a given portion of a shock wave in air are p2p1 4.5 and t2t1 1.687 where 1
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.
the workpart in a turning operation is 88 mm in diameter and 400 mm long. a feed rate of 0.25 mmrev is used in the
Discuss your thoughts on how healthcare organizations and clinicians can go about engaging patients in the healthcare process. How does HIT play a role in this process?
A steel rod of radius 0.01 m and length 2. M is pulled on with a tensile force of 200,000 N, and the bar stretches to a length of 2.08 m. The radius of the bar is reduced to 0.0099 m. Determine the stress, strain, Young's modulus (E), and Poisson's r..
air in the atmosphere is composed of primarily nitrogen oxygen and argon. the mole percents of the compounds are as
the state liquid water is changed from 50 pisa and 50 f to 200 pisa and 100 f. determine the change in the internal
water in a piston-cylinder assembly initially at a temperature of 100oc and a quality of 65 is heated at constant
A solar water heater operating at steady state heats water from 90 0 F to 120 0 F. The panel is 3600 Btu/hr. Determine 1) the mass flow rate of the water in lb/min and 2) the volume of 120 0 F water after 1 hour in gallons.
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