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The fracture strength of glass may be increased by etching away a thin surface layer. It is believed that the etching may alter the surface crack geometry (i.e. reduce crack length and increase tip radius). Calculate the ratio of the etched and original crack tip radii if the fracture strength is increased by a factor of 3 when 75.0% of the crack length is removed.
A reversible heat pump cycle operates between a cold reservoir at 300ºC and a hot reservoir at 500ºC. Determine the coefficient of performance. Is it possible for a heat engine to operate on a cycle with an efficiency of 0.5 between reservoirs at 100..
An energy conscious couple decides to dam up the creek flowing next to their cabin and estimates that a head of 7m can be established above the exit to a turbine they bought on eBay. The creek is estimated to have a flow rate of 0.9 m3/s. What is the..
a simple steam power system has a turbine inlet state of 6.0 mpa and 540 0c and an exhaust pressure 0.008 mpa. the
consider a piston-cylinder system containing 0.1 kg of water. initially the volume of the system is 0.0125 m3 while the
A rigid wall, insulated container is divided into two regions by a removable wall. One region contains 0.1 lbm of CO at 100F, while the other region contains 0.2 lbm of CO at 150?F. A stirrer is inserted into the container and when the wall between t..
a boiler shell is 1.5m in diameter and has plates of thickness 10mm. if the efficiency of the longitudinal joint is 80
a scuba divers 2 ft3 air tank is to be filled with air from a compressed air line at 120 psia and 100 degree f.
A hot-water cylinder contains 150 liters of water. It is insulated, and its outer surface has an area of 3.5 m^2. It is located in an area where the ambient air is 250C, and the overall heat transfer coefficient between the water and the surroundings..
as a particle moves from the origin to 12i 6j m it is acted upon by a force given by 4i 8j n. calculate the work done
a water tower supplies water for a ten story building. water flows from a faucet on the first floor with a maximum
Write a term paper on Tooling design for composite manufacturing - how tooling is designed for different applications to make composite airplane parts and such.
water is the working fluid in an ideal vapor power cycle with reheat. superheated vapor enters the first turbine stage
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