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Helium gas expands from 125 kPa, 350K and 0.25m3 to 100 kPa in a polytropic process with n = 1.667 (or 5/3). Is the work positive, negative, or zero? (b) An ideal gas goes through an expansion process where the volume doubles. Which process will lead to the larger work output: an isothermal process or a polytropic process with n = 1.25?
a horizontal 500 lb force performs at a point d of crankshaft ab which is held in static equilibrium by a twisting
An airplane was moving with a velocity equal to 300 mph when the velocity was increased with uniform acceleration to 600 mph in 5 min, calculate the number of miles the airplane traveled during that interval of time.
A 9º wedge is inserted using a force of 1000 lbs. The static coefficient of friction between the wedge and the log is 0.50. Determine the force required to pull the wedge out.
Evaluate the shearing and normal stresses at points H and J located at the ends of the horizontal and vertical diameters of transverse section located 2.5 in. to the left of bearing B.
an ideal cold air-standard brayton cycle engine operates with air entering the compressor at 27 c. the pressure ratio
you deposit 10000 in a savings account that earns 7.5 simple interest per year. what is the minimum number of years you
air undergoes a process with the states given below. find the change of entropy using the ideas gas table and compare
What is the wear coefficient of the bearing material in m2N-1 ?
a hunter aims directly at a target 140 meter away. if the bullet leaves the gun ay a speed of 280 m/s, by how much will the bullets miss the target?
1 kg of propane is contained in a piston - cylinder assembly at a constant pressure of .20 mpa heat transfer slowly to
A small steel ball bearing with a mass of 13 g is on a short compressed spring. When aimed vertically and suddenly released, the spring sends the bearing to a height of 1.35 m. Calculate the speed at which the ball leaves the spring.
calculate the energy for vacancy formation in al given that the equilibrium number of vacancies at room temperature 25
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