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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.
a subway car leaves station a it gains speed at the rate of 2 ms2 for 6 seconds and then at the rate of 3 ms2 until it
A wheel barrow is used to lift a 200 lb load. The length from the wheel axle to the center of the load is 2 ft. The length from the wheel and axle to the effort is 5 ft. 5. What is the ideal mechanical advantage of the system?
Calculate the expected number of vacancies that will exist in a cubic inch of Aluminum at room temperature (25°C), provided that the activation energy for vacancy formation in Aluminum is equal to 0.75 eV/atom.
an insulated piston-cylinder device contains 0.05m3 of saturated refrigerant-134a vapor at 0.8mpa pressure. the
consider a 22 ton railrod flatcar on which are located two automobiles facing one another and located at each end of
in a steam power plant operating on a reheat rankine cycle steam enters the hp turbine at 15 mpa and 620oc and is
Consider a metal where the activation energy for vacancy formation is 0.95 eV/atom. At 1000 degrees C the fraction of vacancies in this material is:
Consider the (eight) n = 2 states, 12 / m1 ms}. Find the energy of each state, under strong-field Zeeman splitting.
a dragster weighing 1600 lbf attains a speed of 270 mph in the quarter mile. immediately after passing through the
a 45 kg machine is mounted on a spring of stiffness 8e5 nm. when the machine operates at 32 hz the machines steady
a steel bolt is placed through an aluminum tube. sturdy washers are placed on each end of the tube and the bolt is
user uploaded imagea tank of water sits on a cart with frictionless wheels as shown. the cart is attached using a cable
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