Geography, 04.07.2019 20:10, birdman2540
When astronomers discuss objects that give off light, such as the sun, we discuss a concept called "luminosity" which is measured in units of energy per unit time. typically this is given in "watts", the same unit of power that is used to rate lightbulbs. the luminosity of the sun is l = 3.8 ã 10 26 watts. however, the brightness of a luminous object depends on how far away you are from it. this is called the "flux" by astronomers. flux is calculated using the formula f = l 4 ? d 2 . the flux of light we receive from the sun here at earth (a distance of one astronomical unit or d = 1.5 ã 10 8 km from the sun) is called the "solar constant". it's measured to be f = 1362 watts per square meter. saturn is 10 au from the sun. what is the flux that saturn receives from the sun in watts per square meter? (hint: there is a very simple way to calculate this using "scaling" techniques and realizing that saturn is 10 times further from the sun than the earth.)
Answers: 2
Geography, 23.06.2019 00:00, sugandiwoodbine
Match the following items. 1 1 (4,4) 2. (-4,-2) 3. (3.-6) 4. (-4, 6) 5. (1,5)
Answers: 1
Geography, 23.06.2019 07:30, hannahkharel2
Name the two rivers that run through the fertile crescent. how were the rivers both positive and negative to societies of the fertile crescent?
Answers: 1
Geography, 23.06.2019 07:30, alizeleach0123
70 pts answer the following questions in full sentences and paragraphs, using at least 150 words, in the essay box below. 1. which organisms are carnivores? herbivores? omnivores? 2. if the ecosystem is balanced, which populations should be the largest? the smallest? 3. imagine a group of hunters kills half of the rabbit population. how will the other organisms be affected? 4. imagine disease kills 85 percent of the wolf population. how will the other organisms be affected? 5. imagine a foreign mountain lion species is introduced into the ecosystem. how will the other organisms be affected?
Answers: 2
When astronomers discuss objects that give off light, such as the sun, we discuss a concept called "...
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