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To test the aerodynamics of a new prototype automobile a scale model will be tested in a wind tunnel. For dynamic similarity, it will be required to match Reynolds number between model and prototype. Assuming that you will be testing a one -tenth -scale model and both model and prototype will be exposed to standard air pressure, will it be better for the wind tunnel air to be colder or hotter than standard sea-level air temperature of 15C? Why?
consider a carnot heat-engine cycle executed in a closed system using 0.02kg of refrigerant-134a as the working fluid.
a 850-kg meteoroid happens to be composed of aluminum. when it is far from the earth its temperature is -13.5 degc and
Scientists have engineered a new hydrocarbon fuel that generates 4100 Btu from every fluid ounce that is burned. At room temperature, this fuel has a density of 214 lbm/ft^3. What is the heating value of this fuel in kJ/kg?
a piston cylinder device contains 1 kg of liquid water at 200kpa and 25 deg c. heat is added to the water in the
a group of students launches a model rocket in the vertical direction. based on tracking data they determine that the
how many oscillation cycles will elapse if youre waiting for the oscillation amplitude of a spring-mass-damper system
It is required to evaluate the effects of changing surface condenser size on power plant performance. Consider for simplicity an ideal rankine cycle without feed water heaters. the turbine inlet steam is saturated at 1000 psia and has a mass flow rat..
cylinder conditions at the start of compression in an si engine operating at wot on an air-standard otto cycle are 60
Teresa measures the distance that a traverse system moves an object for a given computer-controlled input pulse. She makes 100 readings, and the mean value is 6.832 m with a sample standard deviation of 1.0 cm. The errors in the measurements are assu..
a 120 g ball attached to a spring with spring constant 2.9 nm oscillates horizontally on a frictionless table. its
consider a system in which r 134-a is moved through an evaporator. the evaporator removes energy from the the
The amount of heat (dh = 327.18 KJ) is added to an open volume of 1m3 of air (at standard sea level conditions), causing it to expand to 4 m3. How much work is done by the air? What is the internal energy of the gas after the expansion?
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