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# HW1 - wing As such it is often reported in “pounds per...

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Homework 1 Due: Wed Sept 7 (late due to Labor Day holiday) 1. Read Ch 1 of Anderson. You will need to use other references to look up most of the numbers I ask for below. Cite your references. 2. What is the density of air and water at standard conditions, in MKS units and English units? What is the ratio of the density of water to air? 3. What is the kinematic viscosity of water, air, and motor oil, in MKS and English (foot, lbm, sec) units? What is the ratio of the kinematic viscosities of air and oil to water? 4. What is the standard atmospheric pressure in MKS units? What is it in psi? What is the pressure in air at 30,000 ft (according to the standard atmosphere)? 5. What is the speed of sound in MKS units in standard air? What is your Mach number if you are driving along the road at 30 mph? What is the speed of sound in air at 30,000 ft (according to the standard atmosphere)? What is the airspeed of a 747 flying at 30,000 ft at Mach .87? 6. “Wing Loading” is basically the weight of the aircraft divided by the planform area of the

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Unformatted text preview: wing. As such it is often reported in “pounds per square foot”, at least in the US. It is also the average pressure difference between the lower and upper surfaces of the wing. a. Look up the wing loading of a Cessna 152 (light trainer, low Mach number) and of a 747 (heavy airliner, transonic Mach numbers). b. Convert the above wing loading to “atmospheres”. For the Cessna, you may take the altitude to be sea level. For the 747, use 30,000 feet. (7 on next page) 7. All quantities we will consider in this course have units consisting of combinations of Mass (M), Length (L) and Time (T). Express the units of each of the following in this form (ie as a combination of M, L and T.). Also state it in, specifically, MKS units: (Results given for velocity) Variable name MLT units MKS units Velocity L/T m/s Density Pressure Pressure/Density Density*Velocity^2 Shear stress Mach number...
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