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According to a recent article, hot-air volumes must be large because air heated to 150 degrees Fahrenheit over ambient lifts only .018 lbf/ft^3 compared to .066 and .071 for helium and hydrogen, respectively. Check these statements for sea-level conditions. Calculate the effect of increasing the hot-air maximum temperature to 250 degrees Fahrenheit above ambient.
The system shown anchors a stanchion of cable-suspended roof. If the tension in cable AB is 900 kN, what are the tensions in cables EF and EG?
An Industrial water shutoff valve is designed to operate with 40lbs of force and will encounter 150lbs of resistance force applied to a 2in diameter axle. What is the required actual mechanical advantage of the system?
A cylindrical specimen of this alloy 24 mm in diameter and 186 mm long is to be pulled in tension. Calculate the force necessary to cause a 0.0119 mm reduction in diameter. Assume a value of 0.33 for Poisson's ratio.
a 13.2-N force P is applied to the lever which controls the auger of a snowblower. Determine the moment of P about A when alpha is equal to 30 degrees.
a piston cylinder system containing 0.5 kg of air is compressed from a volume of 0.35 m3 to a volume of 0.1 m3. if the
Longitudinal versus Transverse Vibrations in a bar, A 48 inch long by 2 inch diameter round steel rod (E=30e6 psi, density=0.28 lb/in3) is fixed at one end and free at the other. If the rod is struck transversely so that there is both a longitudin..
Determine (a) the horizontal line along which the shearing stress is a maximum, (b) the constant k in the following expression for the maximum shearing stress.
what are the properties of petrol that it make particularly suitable for the use as fuel in a motor vehicle.
a brass nonmagnetic block a and a steel magnet b are in equilibrium in a brass tube under the magnetic repelling force
air was heated by an electric resitance heater in an insulated piston-cylinder device. the piston weight remained
a standard steel specimen of 13 mm diameter elongated 22 mm when it was subjected to a tensile force of 29.5 kN if the specimen has a length of 200 mm and that force applied within elastic range. what is the elastic modulus of elasticity ?
two particles of equal weight are released from rest on a 35 degree incline when they are 20 m apart. the coefficient
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