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Air at at 300°K and 1 atm. flowing over a flat plate at 30 m/s, how thick is boundary layer at 2.5 cm from the leading edge of the plate? How much is the thickness at 5 cm? Calculate the mass flow through the boundary layer at a distance of 5 cm from the leading edge of the plate.
How much mass flows into the boundary layer in the region between 2.5 and 5 cm from the leading edge?
For what velocity of air should be so that boundary layer is exactly 0.000634?
A piston-cylinder device contains carbon dioxide CO2 (molar mass = 46 g/mol) as shown in the figure. The cross-section area of the piston is 0.25 m2 and the initial cylinder height is 50 cm. CO2 is initially at 40 bar and 500 oC (state 1).
Identify the bus types and the unknown variables of the power flow problem. Write the complete set of equations needed to solve the load flow problem.
An insurance company has made you the following retirement offer. If you pay them $100,000 now, you will receive payments of $8000 a year for 10 years. After this they will pay you $9000 a year in perpetuity (for ever).
find the transfer function and resolution for a 10-turn, 4.7k potentiometer with 3450 degrees of rotation and a 0 to 5 volt output. calculate the resolution in ohms per volt
Filament 1 is on the left, filament 2 is in the middle, and filament 3 is on the right. Filaments 1 and 2 have currents of 1 A in the ba z direction, and filament 3 has a current of 2 A in the ba z direction
Given the narrow audio bandwidth of a telephone transmission facility, a nominal SNR of 56DB and a distortion level of
An amplifier with a voltage gain of +40 dB, an input resistance of 10 k ohms and an output resistance of 1 kohm is used to drive a 1 k ohms load. what is the value of Avo. Find the value of the power gain in decibels.
A 50 hp, 460 V, three phase induction motor draws 61 amps when operating at rated voltage and at a power factor of 0.85 lagging when supplying a rated load. knowns: 1hp=746watts effeciency (n) = Pout/Pin = Pout/(Pout+losses)
An injection-molding machine can be purchased and installed for $90,000. It is in the seven-year GDS property class and is expected to be kept in service for eight years. It is believed that $10,000 can be obtained when the machine is disposed of ..
If the emission, factor of producing electric power by PV cells is 100 g of CO2 per kWh, by wind power is 15 g of CO2 per kWh, and by coal is 1000 g of CO2 per kWh, then find the ratio of CO2 emission when a) 15% of power comes from wind farms
Cradle to death is a typical lifecycle for any given application. The useful life of a particular application will vary based on advancements in a given discipline. It is critical to continuously seek and identify new ways to adapt technology.
In a CDMA system, user A transmits using the Walsh code (-1 1 -1 1 -1 1 -1 1) and user B transmits using the Walsh code (-1 -1 11 -1 -1 1 1), respectively. Show the output at the receiver if A transmits a data bit 0 and B transmits a data bit 0.
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