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An as-wound helical compression spring, made of music wire, has a wire size of 0.092in, an outer diameter of 9/16in, a free length of 43/8in, 21 active coils, and both ends squared and ground. the spring is unpeened. this spring is to be assembled with a preload of 5lbf and will operate with maximum load of 35lbf during use.
(a) estimate the factor of safety guarding against fatigue failure using a torsional Gerber fatigue failure critirion with Zimmerli date.
(b) Repeat part (a) using the sines torsional fatigue critirion (stready stree component has no effect). with zimmerli data.
(c) repeat using a torsional Goodman failure critirion with zimmerli data. (d0 estimate the critirion frequency of th spring.
Decorative water fountains consist of a water reservoir and underground piping to and from a pump. One such system is shown schematically in the figure. The pipe material is PVC(a table is provided). The outlet line from the pump is 18 m and the inle..
the heat supplied by a heat pump used to maintain a buildings temperature is often supplemented by another source of
A baseball is thrown by a pitcher at 95 mph through standard air. The diameter of the baseball is 2.82in. Estimate the drag force on the baseball. State any assumptions.
christian huygens 1629-1695 the greatest clockmaker in history suggested that an international unit of length could be
Plot the spectral blackbody emissive power of the sun versus wavelength in the range of 0.01 micro m to 1000 micro m?
rotor blades of a helicopter are of radius 5.2m and rotating at a constant angular velocity of 5 revs. the helicopter
Estimate the pressure drop across the honeycomb.
As shown in Fig., two kilograms of water undergo a process from an initial state where the water is saturated vapor at 120°C, the velocity is 30 m/s, and the elevation is 6 m to a final state where the water is saturated liquid at 10°C, the veloci..
liquid chromatography lc flow can be model as a packed bed and is described by the ergun equation. lc systems are often
a brass rod k 133 wmk 150mm long and 10mm in diameter extends horizontally from a casting at 200 c. the rod is in an
this is concerned a little more into aerodynamics, what are the uses of wind tunnels including the importance of geometric and dynamic similarity and wind tunnel interference?
The compressor of a refrigeration unit operates with a flow rate of 1800 kg/hr and an isentropic efficiency of 0.75. The working fluid is R-134 which enters as a saturated vapor at 20 C and exits the compressor at a pressure of 1 MPa. Determine the p..
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