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Math Help - physics - associated uncertainty

  1. #1
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    physics - associated uncertainty

    I only have a question regrading part c. I have tried multiple attempts and can't seem to get it right. Anyone who can help.. I'd be truely greatful!

    Time standards are now based on atomic clocks. A promising second standard is based on pulsars, which are rotating neutron stars (highly compact stars consisting only of neutrons). Some rotate at a rate that is highly stable, sending out a radio beacon that sweeps briefly across Earth once with each rotation, like a lighthouse beacon. Pulsar PSR 1937+21 is an example; it rotates once every 1.55780644887275 3 ms, where the trailing 3 indicates the uncertainty in the last decimal place (it does not mean 3 ms). (a) How many times does PSR 1937+21 rotate in 63.0 days? (b) How much time (in s) does the pulsar take to rotate 4.00 106 times and (c) what is the associated uncertainty, in s?

    (a)
    Number
    3494143964 Units
    times (b)
    Number
    6231.226 Units
    s (c)
    Number
    Units
    s
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  2. #2
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    Quote Originally Posted by massid View Post
    I only have a question regrading part c. I have tried multiple attempts and can't seem to get it right. Anyone who can help.. I'd be truely greatful!

    Time standards are now based on atomic clocks. A promising second standard is based on pulsars, which are rotating neutron stars (highly compact stars consisting only of neutrons). Some rotate at a rate that is highly stable, sending out a radio beacon that sweeps briefly across Earth once with each rotation, like a lighthouse beacon. Pulsar PSR 1937+21 is an example; it rotates once every 1.55780644887275 3 ms, where the trailing 3 indicates the uncertainty in the last decimal place (it does not mean 3 ms). (a) How many times does PSR 1937+21 rotate in 63.0 days? (b) How much time (in s) does the pulsar take to rotate 4.00 106 times and (c) what is the associated uncertainty, in s?

    (a)
    Number
    3494143964 Units
    times (b)
    Number
    6231.226 Units
    s (c)
    Number
    Units
    s
    The same question asked and answered here: http://www.mathhelpforum.com/math-he...ant-wrong.html

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