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Air is contained in a piston-cylinder assembly, initially at 40 lbf/in2 and 600 ?R. The air expands in a poly tropic process with n = k = 1.4 until the volume is doubled. Modeling the air as an ideal gas with constant specific heats, determine
a) The final temperature in R, and pressure in lbf/in2, and
b) The work and heat transfer, each in Btu/lb of air
Determine the force in each of the members connecting joints A through F of the vaulted roof truss shown. State whether each member is in tension or compression.
a golfer wants to hit a ball a horizontal distance of 130 meters with a maximum height of 20 meters above his tee-off
The asymmetric simple truss is loaded as shown. Determine the reactions at A and D. Neglect the weight of the structure compared with the applied loads. Is the knowledge of the size of the structure necessary?
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A golden bar of metal (5 centimeters by 18 centimeters by 4 centimeters) being transported by armored car is suspected of being fake, made from a less valuable metal with a thin coating of pure gold. The bar is found to have a mass of 2.7 kilograms. ..
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