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Sitting on the deck one evening. watching for that pesky bunny, jon and his brother see a twig floating down from an aspen tree. (wait - os that a bunny ?) they wonder just what the boundary layer looks like on the twig.
A) Considering that the flow is noraml to the cylindrical - like twig, sketch this boundary layer on the twig. Explain the key physical concepts to the puups.
B) how does the nature of the boundary layer affect lift and frag on the twig?
C) what types of drag are acting on the twig?
D) how would a sudden thunderstorm ( strong wind, rain, hall)) affect the drag ?
In an experiment to estimate the acceleration due to gravity,a student drops a ball at a distance of 1m above the floor. His labpartner measures the time it takes to fall and obtains an estimateof 0.46s.
A 300-acre forested watershed in fair hydrologic condition located on the clayey flat coastal region of Southern California receives 4.0 in. of rain in a 24 hr period.
Freight train A passes through Petticoat Junction, a node where twosingle track lines connect, at 6:50 AM, traveling at 40 MPH, with50 cars that are 70 feet nose to nose. A faster train B jumps ontothe same track at the junction at 9:20 AM.
A triaxial test was performed on a dry, cohesionless soil under confining pressure of 144 kN/m^2. If the sample failed when the deviator stress reached 395.8 kN/m^2, determine the soil's angle of internal friction.
Steam at 100 bars and 550°C enters a turbine operating in steady-state with a volumetric flow rate of 460 m^3/min. 22% of the entering mass flow exits the turbine at 10 bars, 200°C and a velocity of 20 m/s.
The specifications for a project specify that the in-situ soil must be compacted to 98% of its maximum Modified Proctor Density. What is the range of water contents of the in-situ soil that will meet this criteria?
Assume that the design temperature and residence time have been established as 1300 degrees F and 0.6 seconds, respectively. The type of burner used in the process requires outside air at a mass ratio of 12:1 (air to fuel gas).
A 3000 lb vehicle has a drag coefficient of 0.32 and a frontal area of 30 ft2. What is the minimum tractive effort required for this vehicle to maintain a 65 mph speed on a 2% upgrade through an air density of 0.002045 slugs/ft3
A four story office building ha interior columns that are spaced 30ft apart in two perpendicular directions. If the flat-roof loadingis estimated to be 30 lb/ft2 , determine the reducedlive load supported by a typical interior column at ground level.
The relative density of a sloped sand deposit is known to be 75%. Water is observed to be seeped through this slope at a rate such that the discharge velocity is 0.6 m/day. If the hydraulic conductivity for this deposit is 4×10-4 m/s.
An investor has invested $250,000 in a new rental property. Her estimated annual costas are $6,000 and annual revenues are $20,000. What rate of return per year will the investor make over a 30-year period ignoring the salvage value
a tank contains 650 cubic feet of water.the water will be applied on 7 acres of land. What would be the the depth of water im millimeters on the land assuming that there are no losses
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