Mathematics, 27.02.2020 04:30, PLEASEHELP4528
. You've been asked to design a heat (internal combustion) engine with an efficiency of at least 30% on a hot day, when the coolant temperature (TL) is 47°C. Assuming your engine achieves 50% of the ideal Carnot efficiency, what is the minimum temperature TH of the "hot reservoir" (combustion temperature) needed to achieve the desired actual efficiency of 30% or greater?
Answers: 2
Mathematics, 21.06.2019 19:50, Roshaan8039
Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .
Answers: 3
Mathematics, 21.06.2019 20:10, 2Pallie2
Ascientist has discovered an organism that produces five offspring exactly one hour after its own birth, and then goes on to live for one week without producing any additional offspring. each replicated organism also replicates at the same rate. at hour one, there is one organism. at hour two, there are five more organisms. how many total organisms are there at hour seven? 2,801 19,531 19,607 97.655
Answers: 1
Mathematics, 22.06.2019 00:00, lilacastro
The width of a rectangle is half as long as the length. the rectangle has an area of 18 square feet. what are the length and width of the rectangle?
Answers: 1
. You've been asked to design a heat (internal combustion) engine with an efficiency of at least 30%...
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