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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?
a refrigeration engineer has designed a steady-flow no work interaction device that separates a continuous flow of 100
find: a) the pitch diameter of the pinion. b) the pitch diameter of the gear. c) the output torque of the gear. d) the minimum length of the key used to attach the gear?
a 0.12 ounce bullet hits at 2000 fts a suspended 10-lb block of wood and becomes embedded in it. the angle alpha
when environmental crews started cleaning up a closed government wwii laboratory they discovered thousands of unlabeled
a piston-cylinder device contains 2.5 kg of air at 150 kpa and 2 m3. the air is now compressed according to the
body a has a mass of 50 kg while the mass of body b is 20 kg. a force f 500 n is applied to body a parallel to the
a tornado rips off a 100 m2 roof with a mass of 1000 kg. what is the minimum vacuum pressure needed to do that if we
a 5 kg object a and a 10 kg object b undergo an oblique central impact. the coefficient of restitution is e 0.6.
capacitor with capacitance 6.00 microf is connected to a resistor with r 780 o in series and an emf source of 25.0 v
a gas power cycle compresses air at 1 bar and 300 k state 1 through an adiabatic reversible compressor to 6 bar state
a 3 cubic meter tank contains propane at 0.5 mpa and 3degc. gas leaks out of the tank. at the time of detection of leak
If the efficiency of the turbine in converting the mechanical energy given up by the fluid to the turbine shaft is 89% (nt = 0.89), calculate the friction loss in the turbine in J/kg.
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