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In a household air condition system, R-134a is condensed steadily in an adiabatic closed heat exchanger by air. Air enters at 25 C and exits at 75 C with a volumetric flow rate of 0.2 m^3/s. The R-1
Determine the magnitude of force P acting on the crate. The coefficient of kinetic friction between the crate and the ground is mu k = 0.3.
A heavily insulated piston-cylinder device contains 0.05 m3 of steam at 300 kPa and 150 degrees Celcius. Steam is now compressed in a reversible manner to a pressure of 1 MPa. Determine the work don
At the exit, the pressure and velocity are 1.45 bar and 360 m/s respectively. Assuming ideal gas behavior for air, determine the heat transfer per unit mass of air flowing through the duct in kj/kg.
Air is adiabatically compressed in a non flow process from a pressure of 14.7 psia and a temp of 70 deg to 200 psia and 350 deg. if the Cv of the air is 0.171 btu/lbm R, determine the change in spec
Calculate the moment (MN-m) on the door hinge post on line A-A resulting from the hydrostatic pressure on the door for two cases: a) the channel wall as given by the function y(x), b) for the case w
Calculate the heat lost by the plate (bottom is insulated). What is the temperature at the bottom of the plate if the thermal conductivity of the plate is 25 w/m*k
Hot water traveling through a thick-walled steel pipe (k=60 W/m·K) is cooled externally by a cross-flow airstream at a velocity of 20 m/s at a temperature of 25ºC.
Determine the specific volume of superheated nitrogen gas at an absolute pressure of 678 kPa and -134°C based on (a) the ideal-gas equation.
For a piece of aluminum stock choose a grinding wheel that will grind .050 of stock from it. Show the grinding wheel with a proper code. Explain why you chose this wheel (look at Machinery's Handboo
For problem 3/72 in Meriam and Kraige's 6th edition dynamics, why is the max normal force at the side? How can we prove that mathematically?
For this case, assume that the pressure losses in the injector etc. are neglected. Determine required mass ratio given hydrazine Isp, make sure that the numbers add up.
If these readings are 333K and 138kPa, respectively, and the static pressure is 101.3 kPa, calculate Mach number, static temperature, and air velocity at the instrumented station.
Determine the difference between these values and the corresponding static values in the undisturbed atmosphere ahead of the airplane.
The rope winds at a constant velocity of 5m/s and the 3kg Block B creates a force on the arm AA'. How long does it take for the tension in the rope to equal the force that is created on the arm, AA
Water at 120 F and 60 psia flows through a ½" diameter pipe at 0.6 lbm/s and is steadily mixed with 0.2 lbm/s water at 60 F and 60 psia from a ½" diameter pipe.
If the force exerted on cable AB by the motor is F =100t^(3/2) N, where t is in seconds, determine the 50-kg crates velocity when t = 5s.
Determine the composition of the gas on a mass basis. If the moisture were to be condensed before the gas is let out, what would be the composition of the outgoing gas?
Relative a reference frame the recorded motion of P for the first t seconds is: r(t)=[(2.25+2.13t^3)i+(225+0.993t^2)j]m. Determine the velocity and speed of P and what is the acceleration of P.
A high-speed jet of water at an absolute velocity of Vjet = 15 km/h to the right strikes the back of the car. The relative velocity of the water is?
A piston-cylinder device contains an ideal gas. The gas undergoes two successive cooling processes by rejecting heat to the surroundings. What is the work done on the gas by the piston?
The CO2 is cooled at a constant pressure as it flows in the pipe and the temperature drops to 465 K a the exit. Using ideal gas equation determine the volume flow rate at the inlet.
A 0.12-m3 rigid tank contains saturated refrigerant- 134a at 800 kPa. Initially, 25 percent of the volume is occupied by liquid and the rest by vapor. A valve at the bottom of the tank is now opened
The device is now cooled until the temperature reaches 0 degrees celcius. Determine the change of the volume of the device during this cooling.
Obtain the continuity equation in cylindrical coordinates by expanding the vector form in cylindrical coordinates. To do this, make use of the following relationships connecting the c