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Air at 40 degree Celsius enters a mixing chamber at a rate of 225 kg/s where it mixes with air at 15 degree Celsius entering at a rate of 540 kg/s.
What is the minimum required length of the rod so that one end of the rod can be twisted 30 degrees with respect to the other end without exceeding the allowable stress?
The temperature in a vessel is 36 degree Celsius and the proportion by mass of air to dry saturated steam is 0.1. What is the pressure in the vessel in bar and in mm of mercury vacuum? The barometr
Find the amount of each cash flow in an equal quarterly cash folw series that equivalent to the increasing cash flow series. The interest rate is 14% and compounding is done quartely.
A piston cylinder containing Ar at some initial temperature(To), is allowed to cool. How much heat [Q] nad work [W] is lost to the surroundings if Vo = 0.15 m^3 and T1 = 650 K. Assume constant specifi
Following the process after having obtained answers for (b) the dividing medium is now allowed to move and the insulation is again replaced, preventing heat transfer. What are the final pressures an
Assuming you have a thermometer and a device to measure the speed of sound in a gas, explain how you can determine the mole fraction of helium in a mixture of helium gas and air.
If the sliding container from b is placed in an environment at 450 kPa & 298 K what is the final volume, temperature & pressure of the containers contents?
Air is compressed adiabatically from 14.7 psia, 70 , to 58.8 psia, and 76 Btu/lbm of work is required. Neglecting changes in kinetic energy, calculate the incremental additional work required due to
Now we have to find a new material so he can spin the ball at the highest angular velocity. Derive an index to choose a material that will allow for maxiumum angular velocity.
Steam having a specific enthalpy of 160 kJ/kg and pressure of 1 kPa enters an adiabatic pump. Upon leaving the pump, the steam is at a pressure of 1200 kPa and has a specific enthalpy of 170 kJ/kg.
Five kilograms of water (H2O) sealed in a piston-cylinder device undergoes 3 quasi-equilibrium processes that complete a cycle. Find properties & the cycle work and heat transfer input, WCYCLE and
Consider a wind turbine with a 90-m blade span subjected to 25-km/h steady winds. If the combined turbine-generator efficiency of the wind turbine is 32 percent.
Calculate the Reynolds number for water (dynamic viscosity of 7.98 * 10-4 Ns/m2) flowing through a rectangular pipe 4 cm wide and 5 cm high at 10 cm/s if the water level is 50%.
A simplified single-cylinder internal combustion engine that produces 20 hp is shown in figure 4-33. It loses 40 kJ/min in radiated and conducted heat while using 0.73 kg/min of fuel-air mixture whi
What is the contribution to the moment about point O made by the x component of the force F at point A? What is the contribution to the moment about point O made by the y component of the force F at
Water is flowing at 10 cm/s in pipe with a diameter of 5 cm when it hits a bifurcation, some of the water travels down one pipe with a diameter of 3 cm at 8 cm/s.
Boiling water flows through thin-walled copper tubes in a cross-flow heat exchanger, and atmospheric air flows across the tubes, yielding a heat transfer coefficient of 70 W/m2.K for the outside sur
A rigid, insulated tank that is initially evacuated is connected through a valve to a supply line that carries helium at 200 kPa and 1200C. Now the valve is opened, and helium is allowed to flow int
The engine of an automobile supplies 180 hp at 2500 rpm to the drive shaft. If the maximum shearing stress in the drive shaft must be limited to 6 ksi.
A hydrocooling unit can cool fruits and vegetables from 30 to 5 oC at a rate of 20,000 kg/h under the following conditions: the channel is 3 m wide by 90 cm high.
Estimate the time it takes for the chamber pressure to drop to 0.7 MPa. Assume that at the instant combustion ceases, the chamber propellant supply stops completely, and also that gamma = 1.2 and M
The frontal area of the bicyclist and bicycle together is 0.362 m2, the drag coefficient is 0.88, the coefficient of rolling resistance is 0.007. Determine the speed V of the bicyclist.
An air-standard Diesel cycle is operated with a compression ratio odf 20. The heat input is 300 Btu/lbm. At the beginning of the compression stroke, the conditions are 15 psia and 70 degrees F.
Determine (a) the final pressure and the quality (if mixture), (b) the boundary work, (c) the amount of heat transfer when the piston first hits the stops, (d) and the total heat transfer.