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The blade is bolted to a bracket attached to the motor shaft O, which protrudes through the bracket and blade. Determine the normal force at C. State any assumptions. Does it matter whether the bolt
A late-model Hummer has a frontal profile area of 3.1 m2 and a CD of 0.47. It is moving at a steady speed of 75 mph. a) If we ignore bearing friction, rolling resistance and "Johnny Law", how much p
Find the following: (a) the final volume and the mass of the air at that point, (b) the work done by the air and work done on the atmosphere.
A high school project involves building a model ultralight airplane. Some of the students propose making an airfoil from a sheet of plastic 1.5 m long by 2 m wide at an angle of attack of 12o.
Find the crank position corresponding to the maximum piston velocity for an in-line slider crank mechanism. Crank speed w is constant, and the ratio of the connecting rod to the crank length is L/R=
In state and national forests it is common to store water in large water towers for reserve in the case of forest fires. To deliver water, the reservoir is connected to a downpipe and then a horizon
What is the maximum number of break failures that can be tolerated and still satisfy this specification? Assume that the weight is loaded equally among the wheels and that we have 24 brake systems,
A large food-processing plant requires 1.5 lbm/s of saturated or slightly superheated steam at 140 psia which is extracted from the turbine of cogeneration plant. The boiler generates steam at 800 p
A gallon of milk at 68oF is placed in a refrigerator. How many minutes will it take for the milk to cool to 48oF? How many minutes to cool another 10oF to 38oF?
The corresponding Rankine cycle for an actural power plant(using water) runs at a high pressure of 6.3MPa, a low pressure of 0.01 MPa, and a high temperature of 779K. The actural entropy increase in
Consider a stream power plant that operates on the ideal reheat Rankine cycle. The plant maintains the boiler at 7000kPa, the reheat section at 800 kPa, and the condenser at 10 kPa. The mixture qual
Air is compressed by a 30-kW compressor from P1 to P2. The air temperature is maintained constant at 25 degrees C during this process as a result of heat transfer to the surrounding medium at 17 deg
A steady flow compressor is used to compress air from 1 atm, 25ºC to 8 atm in an adiabatic process. the compressor efficiency is 87%. Calculate the actual work required to compress the air.
A 0.5 m^3 tank contains air at 300 K and 0.75 MPa. A valve is suddenly opened and air rushes out until the tank pressure drops to 0.15 MPa. The air in the tank at the end of the process may be assum
Air enters the compressor section of a turbojet engine at 15 C and 0.1 MPa at a rate of 100 m^3/min. The air leaves at 0.5 MPa Changes in potential energy and kinetic energy are negligible.
Discuss how the steam power plant (steam engine) (Rankine cycle) can control the speed of the vehicle during acceleration and deceleration.
A 10 kg slab of Cr-V steel at 900 C is to be quenched by immersing in a vessel of water. Assume the slab exhibits a spatially uniform temp, T, and there is no heat transfer between water and air.
All elbows are 90 degrees with K factor = 0.75. Pipe lengths and inside diameters are given in the figure. Determine also the heat-generation rate due to frictional pressure losses.
A company crates its products for shipping as shown (base plate with two springs holding a crate- mass suspended in crate by single springs above and below).
A sphere 1 ft in diameter is moving horizontally at a depth of 12ft below water surface where the water temperature is 50 degrees ferinheight. At what speed in still water will cavitation first occur
A mass of 1.0 kg sits atop a spring mounted to the ground. The system is subjected to a half-sine shock pulse of duration T=0.1 sec and magnitude Fo=1.0 N. Determine the value of k such that resona
What is the effect on a combustion system of (i) increasing the excess air fraction; (ii) incomplete combustion? Give reasons for your answers. Describe the effects on (i) the power output and (ii)
For a material with an FCC crystal structure whould slip be more likely to occur along the (11) plane or the (100) plane? Why?
In an oil refinery methane gas (CH4) enters a compressor at a steady rate of 0.9 kg/s and at a pressure 2 bar, temperature of 60deg C and a velocity of 60 m/s. At exit from the compressor, the metha
Determine atsteady state the volumetric flow rate of air exiting the building,in ft3/min. When expressed in terms of teh volume ofthe occupied space, determine the number of building air changesper