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1. You have been asked to select a material for a spring that is to be stressed in tension. It is to consist of 10 coils, and the coil-to-coil diameter called for is 15 mm; furthermore, diameter required such that the spring will not plastically deform when subjected to the above load.
2. A helical spring is to be constructed from a 4340 steel. The design calls for 5 coils, a coil-to-coil diameter of 12 mm, and a wire diameter of 3 mm. Furthermore, a maximum total deflection of 5.0 mm is possible without any plastic deformation. Specify a heat treatment for this 4340 steel wire in order for the spring to meet the above cri- teria. Assume a shear modulus of 80 GPa for this steel alloy, and that ty = 0.6y. Note:
Heat treatment of the 4340 steel is dis- cussed in Section 10.8.
An ogee spillway of a gravity dam is to be modeled using water. The spillway section is 40 feet high, its crest length is 60 feet and the maximum discharge is 3,000 CFS when the head on the crest of the spillway is 5 feet. Using a model scale of 1:10..
Experiments have shown that the transition from laminar to turbulent conditions for flow normal to the axis of a long cylinder occurs at a critical Reynolds number of ReD,c = 2 X 105, where D is the cylinder diameter.
Water vapor at 100 lbf/in^2, 500 degrees F and a velocity of 100 ft/s enters a nozzle operating at steady state and expands adiabatically to the exit, where the pressure is 40 lbf/in^2. If the isentropic nozzle efficiency is 95%, determine for the no..
consider a front loader washer that weighs 200 lb with a 6 lb towels. the size of the drum is 0.4 m. during a spin
some pollution like the now banned toxic pesticide ddt dichlorodiphenyldicholorethaneand its relative dde
a nuclear power plant produces 1.2 gw of electric power at a system efficiency of 20. the plant rejects heat into a
A 2-m^3 rigid tank contains refrigerant-134a vapor at 1.4 MPa, 180C. Determine the mass of the refrigerant in kilogram using:
SO3 has many uses including the production of sulfuric acid (H2SO4). A gas stream having the (molar) composition shown in the figure below is to be passed through a two-stage converter. The fractional conversion of SO2 to SO3 (per single pass) in the..
The patch is applied to the skin, which contains an initial drug concentration of pA,s,i = 0. At the patch-skin interface located at x = 0, the ratio of the medication density on the patch side to the medication density on the patient side is desc..
A 100-watt motor (60% efficient) is used to raise a 100-kilogram load 5 meters into the air. How long, in units of seconds, will it take the motor to accomplish this task?
consider heat transfer to a turbulent boundary layer with no pressure gradient or transpiration but with a vanishingly
a geothermal power plant utilizes steam produced by natural means underground. steam wells are drilled to tap this
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