Engineering, 28.12.2019 03:31 ikahypp
For an automotive spark-ignition engine, the combustion duration (from time of ignition through completion) is approximately one-sixth of a crankshaft revolution. this corresponds to a time of approximately 17 ms at an engine speed of 600 rev/min. to maintain the same combustion duration of one-sixth of a crankshaft revolution at 3,000 rev/min, turbulence must increase the mass rate of conversion of reactants to products by a factor of compared the rate of conversion at 600 rev/min.
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Engineering, 04.07.2019 19:10
The proportional limit is always greater than the yield strength for a material. a)-trune b)- false
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Engineering, 04.07.2019 19:10
Plan an experiment to measure the surface tension of a liquid similar to water. if necessary, review the ncfmf video surface tension for ideas. which method would be most suitable for use in an undergraduate laboratory? what experimental precision could be expected?
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Engineering, 04.07.2019 19:10
Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.
Answers: 1
Engineering, 06.07.2019 03:10
Steel balls 12 mm in diameter are annealed by heating to 1150 k and then slowly cooled to 400 k in an air att 325 k and h -20 w/m2 k. assume the properties of the steel to be k- 40 w/m k,p 7800 kg/m3, and cp 600 j/kg k. a. determine whether lumped system method can be used to analyze this problem and if so why" b. determine the time required for the cooling process. c. determine the total amount of heat lost from each ball to the ambient air
Answers: 1
For an automotive spark-ignition engine, the combustion duration (from time of ignition through comp...
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