Physics, 13.07.2019 22:10, Tonyswife15
Temperature on a planet the sun radiates energy approximately as a blackbody, with the effective surface temperature te and radius ro given in section 1.4 of phillips (as well as in a useful table inside the back cover). the distance of earth from the sun d 1 a and the radius of the earth r are given inside the back cover. (a) assume that the earth absorbs all solar radiation that falls into its cross- sectional area of π , and reradiates it as a blackbody from its entire surface area, 4tra. find the consequent equilibrium temperature of the earth, teq (b) known forms of life require liquid water, and temperatures low enough for biological molecules to be stable. find the range of distances from the sun, in au, where the equilibrium temperature of the earth lies in the range tmin - 0 c 〈 teq 〈 100 c-tmaz-(water remains liquid at higher temperatures. at pressures much greater than earth's atmospheric pressure, but biological molecules have a hard time surviving at those high temperatures.) this is sometimes known as the "goldilocks zone" or the "circumstellar habitable zone." arguably, life can arguably exist outside of this zone (and planets within it can certainly be inhospitable to life); but extrasolar planets in this zone might well harbor extraterrestrial life - an exciting possibilit c) proxima centauri is the nearest star to the sun. it has radius 0.141 ro and total (bolometric) luminosity 1.7 × 10-3 lo. find the effective temperature of proxima centauri, in k. find the range of distances, in au where 0 c 〈「q 〈 100 c
Answers: 3
Physics, 22.06.2019 07:50, brittneeyy
Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).
Answers: 3
Physics, 22.06.2019 09:00, NatalieAllen11
What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.
Answers: 2
Physics, 22.06.2019 18:30, yuvraj2298
Ahot-air balloon takes off from the ground traveling vertically with a constant upward acceleration of magnitude g/4. after time interval δt, a crew member releases a ballast sandbag from the basket attached to the balloon. how many seconds does it take the sandbag to reach the ground? (express your answer in terms of δt)
Answers: 2
Temperature on a planet the sun radiates energy approximately as a blackbody, with the effective sur...
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