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Math Help - Help, this is hard!

  1. #1
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    Help, this is hard!

    Q: Evaluate, giving your answer to

    1) 2 dp's
    2) 3 sig figures

    0.5 x 8.32 x 10^-31 x (1.84x10^5)^2 x 10^20


    Please help, im stuck!

    Thanks in advance.
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  2. #2
    Junior Member
    Joined
    Dec 2008
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    Type your entire sum into a calculator and press equals.

    1. Write out that answer with just two numbers after the decimal point e.g. 52387.6680923 would be written as 52, 387.67 as the third number is rounded up or down.

    2. Round your number to the nearest 100. 52387.6680923 to the nearest hundred is 524 hundred, also known as 52400.

    If you were supposed to do this in your head, gl.
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  3. #3
    Newbie v.Huynh's Avatar
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    Quote Originally Posted by isuckatmaths View Post
    Q: Evaluate, giving your answer to

    1) 2 dp's
    2) 3 sig figures

    0.5 x 8.32 x 10^-31 x (1.84x10^5)^2 x 10^20


    Please help, im stuck!

    Thanks in advance.
    What Bruce said above is correct. If you need help with the sig figures. Then just look at your lowest number which is 0.5

    So whatever you answer is make sure it has 2 numbers in it such as 55, 0.6, 32, etc.

    Hope this helped.
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  4. #4
    Newbie
    Joined
    Jan 2009
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    Hi

    Regarding: equation = 0.5 x 8.32 x 10^-31 x (1.84x10^5)^2 x 10^20

    Take a minute & note that you can rearrange the products to make them easier to calculate, before you reach for the calculator.

    (10^-31)(10^20) = 10^-11 (adding the powers)

    Also (1.84x10^5)^2 = (1.84^2)(10^10)

    So the powers of 10 become (10^-11)(10^10) i.e. 0.1.

    => equation = 0.5 x 8.32 x (1.84^2) x 0.1
    = (1.84^2) x 0.5 x 0.832, which is easier, yes?

    On your calculator it's easier to do the squaring first.
    Last edited by NoFear; January 31st 2009 at 02:45 AM. Reason: Maths error.
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