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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)
given that the relaxation time a is 177.46 days what is the activation energy of a rubber band if the pre-exponential
A piston-cylinder containing liquid water at 20 Celsius undergoes a constant pressure process at 25 bars, to a final temperature of 400 Celsius. Draw the T-v diagram. Determine the work and heat transfer for each of the three parts of the process (a)..
a stationary gas turbine plant operates on the brayton cycle and delivers 20000 kw to an electric generator. the
a car air conditioning system operates with r-134a in the peak summer outside at 100degf and inside desired at 77degf.
Air in an ideal Diesel cycle is compressed from 4L to .25L, and then it expands during the constant pressure heat addition process to 0.50L. Under cold air conditions, how much is the thermal efficiency of this cycle?
suppose the transfer function of a controlled system is given bygsks0.1s10.01s1design a controller to this system and
air flows in a round pipe at a rate of 0.015 lbmsec. the air enters the pipe at a temperature 76.8 of and a pressure
What is the correct decimal notation for the number 1.345 x 10-1?
An advanced-type supercritical power plant has turbine inlet steam at 7000 psia and 1400 F, double reheat at 1600 psia and 400 psia, both to 1200 F, and condenser at 1 psia. The three turbine sections have polytropic efficiencies of 0.93, 0.91, and 0..
consider a gas-turbine power plant whose pressure ratio is 8. the isentropic efficiencies of the compressor and the
a piston-cylinder assembly contains 1kg of water initially occupying a volume of 0.5m3 at 1bar. energy transfer by heat
An inventor claims to have developed a device that converts heat transferred to it at 1500 degrees Fahrenheit into work with a thermal efficiency of 70%. Heat is rejected to the 70 degree Fahrenheit surroundings. Is this possible? Why or Why not?
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