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Homebuilding has undergone significant advances in the last 20 years, due largely to replacement of hand tools (hammers, saws, screwdrivers) with the power equivalents. Nowadays if you watch roofers lay shingles you hear the ''thump-thump" of a pneumatic nailer instead of the "whack-whack-whack" of a framing hammer hitting a nail. A pneumatic nailer is nothing more than a piston-cylinder device. When the trigger is pulled it allows compressed air (initially at 75 F and a pressure between 70 and 120 psig) to expand; the resulting stroke drives a nail through the shingle and into the roofing plywood. Assume that the piston is 1 inch in diameter, and that the nailing stroke is 2 inches. The air is initially contained in a chamber that is 2 in long at a pressure of 90 psig and temperature of 75 F. The average force exerted by the piston on the nail is 50 lbf. The process occurs very rapidly so can be approximated as adiabatic. What is the average air pressure exerted on the piston? Report your answer in psig. How much work is done on the piston during air expansion? Report your answer in ft-lbf. What is the temperature of the air at the end of expansion? Report your answer in F.
a bucket of mass 2.0kg is whirled in a vertical circle of radius 1.1m. at the lowest point of its motion the tension in
a spherical balloon contains 2 kg of water at 230 degrees c 400 kpa the specific volume is 0.5951 m3kg. the balloon
question helpquestion 1 determine the headwater depth of a 1000 mm high by 1500mm wide concrete box culvert operating
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a bullet of mass 0.06 kg is fired horizontally into a wooden block of mass 0.10 kg. the wooden block is suspended from
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A 0,5Kg mass attached linear spring suffress 01 N/m. Determine be naturak frequency of the system in hortz e reapert this calculation for a mass of 50Kg and a suffress of 10N/m and compare your result to that of part.
Calculate the change in length of the component - calculate the shear strain in the circular section and the square section
You are designing a remote-area power supply based on a miniature wind turbine that is 20% efficient. Meteorological data indicates an average wind speed of 24 km/h at an air temperature of 10oC and pressure of 0.9 atm. The rotor has a diameter of..
For a vehicle in gravitationless space, determine the mass ratio necessary to boost the vehicle velocity by 1600 m/sec; the effective exhaust velocity is 2000 m/sec and the initial total vehicle mass is 4000 kg.
A car and a high -speed trian at constant speeds. three seconds after the train passes under the highway bridge the car crosses the bridge.
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