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richgall____
 one year ago
Medal!
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 1.55 ⋅ 10^7 seconds?
Part B: Which is the more reasonable measurement of the distance between the tracks on a CD:
1.6 ⋅ 10^–3 mm or 1.6 ⋅ 10^3 mm? Justify your answer.
richgall____
 one year ago
Medal! 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 1.55 ⋅ 10^7 seconds? Part B: Which is the more reasonable measurement of the distance between the tracks on a CD: 1.6 ⋅ 10^–3 mm or 1.6 ⋅ 10^3 mm? Justify your answer.

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PhantomCrow
 one year ago
Best ResponseYou've already chosen the best response.1Do you know how to multiply scientific notation?

richgall____
 one year ago
Best ResponseYou've already chosen the best response.0i have the ti84 calculator that multiplies things

PhantomCrow
 one year ago
Best ResponseYou've already chosen the best response.1Right, but we want to multiply it without expanding it. Do you know how to multiply the numbers keeping them in scientific notation?

PhantomCrow
 one year ago
Best ResponseYou've already chosen the best response.1Okay. First, we multiply the decimal number. After, we keep the base of ten and add the exponents (since we add exponents when multiplying the same base)

richgall____
 one year ago
Best ResponseYou've already chosen the best response.0so do i multiply 3.9 times 1.55?

richgall____
 one year ago
Best ResponseYou've already chosen the best response.0and with the expontents part it will be 10^40

PhantomCrow
 one year ago
Best ResponseYou've already chosen the best response.1Yep! So your answer is 6.045 x 10^40

PhantomCrow
 one year ago
Best ResponseYou've already chosen the best response.1As for part B, remember that a negative exponent on ten means that the number is less than 1 and any positive exponent is equal to or greater than 1.

richgall____
 one year ago
Best ResponseYou've already chosen the best response.0SO i multiply 1.6 ties 1.6??

PhantomCrow
 one year ago
Best ResponseYou've already chosen the best response.1No. It's asking you to chose between two measurements for the distance between two tracks on a CD.

richgall____
 one year ago
Best ResponseYou've already chosen the best response.0I think 1.6 time 10^3

PhantomCrow
 one year ago
Best ResponseYou've already chosen the best response.11.6 x 10^3 mm = 1.6 meters 1.6 x 10^3 mm = 0.0016 mm. In the scale of a CD, which one would be logical?

PhantomCrow
 one year ago
Best ResponseYou've already chosen the best response.1Yes. But do you see why it is?

richgall____
 one year ago
Best ResponseYou've already chosen the best response.0Yea because tracks are like the song and it takes longer time to switch between them

PhantomCrow
 one year ago
Best ResponseYou've already chosen the best response.1Also, because a CD is nowhere near 1.6 meters in diameter.
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