Physics, 14.05.2021 06:10 mindofnyny
In one cycle, an engine burning a mixture of air and methanol absorbs 525 J and expels 415 J, what is the engine’s efficiency?
Answers: 3
Physics, 22.06.2019 01:50
Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called
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What is the single most important equation in all of physics?
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Physics, 23.06.2019 01:30
Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.
Answers: 1
Physics, 23.06.2019 06:30
Asquare isothermal chip is of width w=5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated; the front surface is exposed to the flow of a coolant at tinf=15 °c. from reliability considerations, the chip temperature must not exceed t=85 °c. if the coolant is air and the corresponding convection coefficient is h=200 w/m2 x k, what is the maximum allowable "power" of the chip? if the coolant is a liquid for which h=3000 w/m2 x k, what is the maximum allowable power of the chip?
Answers: 2
In one cycle, an engine burning a mixture of air and methanol absorbs 525 J and expels 415 J, what i...
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