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Spring98

  • one year ago

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.

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  1. welshfella
    • one year ago
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    Part A Just multiply the 2 numbers

  2. Spring98
    • one year ago
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    the answer would be 9.555

  3. welshfella
    • one year ago
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    Part B 7.4 * 10^4 mm = 74 meters

  4. Spring98
    • one year ago
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    wait so is that how i really do it?^

  5. welshfella
    • one year ago
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    The first part is 9.555 but what about the exponent of 10 ??

  6. welshfella
    • one year ago
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    you also have to multiply 10^33 and 10^5

  7. Spring98
    • one year ago
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    ohhok hold on

  8. Spring98
    • one year ago
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    so is it 10^165?

  9. welshfella
    • one year ago
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    No you ADD the exponents

  10. Spring98
    • one year ago
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    oops ok so it is 10^40

  11. welshfella
    • one year ago
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    9.55 * 10^38

  12. welshfella
    • one year ago
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    * sorry 9.555 * 10^38

  13. Spring98
    • one year ago
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    seconds right?

  14. welshfella
    • one year ago
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    No ergs amount of radiant energy

  15. Spring98
    • one year ago
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    thank you very much. You are the best helper ever!! :)

  16. welshfella
    • one year ago
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    yw as for part B the distances will be very small right? and numbers like 10^4 are very large!!!

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