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A tensile sample of width 10mm contains an internal crack of length 0.3mm. When loaded in tension the crack suddenly propagates when the stress reaches 450 MPa. What is the fracture toughness K1c of the material of the sample? If the material has a modulus E of 200 GPa, what is its toughness? (Assume Y =1)
air is enclosed by a rigid cylinder containing a piston. a pressure gage attached to the cylinder indicates an initial
Diffusion in liquids commonly assumed a rigid sphere in a continuum. When would this model be most accurate?.When could it fail? Diffusion varies with viscosity to the (+1) power in gases but to the (-1) power in liquids. Why?
Water enters a boiler at 160 psia as a saturated liquid and leaves at 600 degree F at the same pressure. Calculate the heat transfer per unit mass of water.
every work producing system results in wasted energy. thermal efficiency gauge sthe conversion of heat to work in a
1.based on the hume-rothery rules speculate on the possible driving forces behind the tendency for ordering in this
If the weather report says that it is 60°F outside, the barometric pressure is 28.50 in Hg, and the relative humidity is 85.0%, find the following values. The partial pressure of water. The mole fraction of water vapor in the air
A water pipe of D = 30 cm is buried in soil with a value of k = 0.52 W/mK. The center of the pipe is buried 1 meter below the surface of the ground. The surface of the ground is at -10o C.
a. if the largest internal crack in a polycarbonate sheet is 0.100mm long and there are no surface cracks what is the
an infinitely long sheet of charge of width l lies in the xy-plane between x - l2 and x l2. the surface charge
a patio is in the shape of a circular sector with a central angle of 160.0 degrees. it is enclosed by a railing of
A vertical piston/cylinder device contains 0.01 lbm of gas. The initial gas volume is 0.18 ft3 and the initial specific internal energy is 282 Btu/lbm. The piston, with a mass of 110 lbm and cross-sectional area of 0.11 ft2, is in equilibrium with th..
a turbine is operated with an enthalpy at entrance of 1340 btulbm and an exit enthalpy of 1285 btulbm. if the entrance
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