Mathematics
Zeehai
2015-11-01 01:43:03
Part A: The sun produces 3.9 ⋅ 10^33 ergs of radiant energy per second. How many ergs of radiant energy does the sun produce in 2.45 ⋅ 10^5 seconds? Part B: Which is the more reasonable measurement of the distance between the tracks on a DVD: 7.4 ⋅ 10^−4 mm or 7.4 ⋅ 10^4 mm? Justify your answer. @Banabanana
ANSWERS
koledriscoll
2015-11-01 04:57:00

Part A. [latex](3.9*10^{33})(2.45*10^5) = 3.9*2.45*10^{33+5}=9.555*10^{38} ergs[/latex] Part B. The distance between the tracks on the DVD is very small, so the answer is 7.4 ⋅ 10 ^-4 (the negative power of 10 means that the number 7.4 ⋅ 10 ^-4 is less than 0). [latex]7.4*10^{-4}= cfrac{7.4}{10^4}= cfrac{7.4}{10000}= 0.00074 mm[/latex]

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