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A piston-cylinder device contains 12 kg of saturated R-134a vapor at 3.2 bars. An electric source supplies 8 A current to a resistor within the cylinder for 4 minutes and there is heat transfer of 400 kJ to the system. During these energy interactions, the pressure is maintained constant in the cylinder. The refrigerant reaches a final temperature of 700C.
Determine (a) the voltage of the source.
(b) Show the expansion process for the R-134a on a P-v diagram. Label states, show property values, and indicate appropriate lines of constant pressure
initially 0.05 kg of air is contained in a piston-cylinder device at 200 degc and 1.6 mpa. the air then expands at
Liposomes are promising molecules in gene transfer technology because of their similarity to cell membranes and their charge interactions with negatively charged DNA. Estimate the charge on the outside surface of a liposome of diameter 1 um. Suppose ..
a point p starts from rest and accelerates uniformly to a speed of 88ftsec after travelling 130 ft. find the
A pin-connected structure consists of a rigid beam ABCD and two supporting bars. Bar (1) is an aluminium alloy [E = 70 GPa] with a cross-sectional area of A1 = 2,400 mm2. Bar (2) is a bronze alloy [E = 100 GPa] with a cross-sectional area of A2 = 6,0..
A 20-centimeter wrench is used to loosen a bolt. The force is applied 0.20m from the bolt. It takes 50 new tons to loosen the bolt when the force is applied perpendicular to the wrench. How much force would it take if the force was applied at a 30-de..
Calculate the modulus of elasticity of the aluminium alloy. Use the modulus to determine the length of a 1.25 m bar to which a stress of 210 MPa is applied.
A ball is dropped inside an evacuated tube so that there is no aerodynamic drag acting on the ball. At one point it is at a height of 2.5 m and is dropping at a speed of 1.0 m/s. What will be the height of the ball when its speed is 5.0 m/s? Take g= ..
Using MATLAB Simulink, set up the negative feedback system of and find the value of the gain
an isolated chamber with rigid walls is divided into two equal compartments one containing steam at 10 bar and 370oc
an oil pipeline was constructed to transport an oil with sg 0.8 for a distance of 10 miles. the country was hilly so
A collar B of weght W can move freely along thevertical rod. The constant of the spring is k and the spring is unstretched when theta=0. Derive an equation in W thrta k and l that must be satisfied when h collar is in equilibrium.
the advance ratio j for a propeller is defined as jvnd where v is the velocity n is the propellers revolutions per
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