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the following calculations all involve physical quantities Watch

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    (Original post by Zacken)
    Fair enough.
    In this two plusses and two minuses case you could be comparing the differences between two pairs of reactions ^.^
    (a-b)-(c-d) if greater than 0 the difference between the first pair is larger etc
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    (Original post by ValerieKR)
    In this two plusses and two minuses case you could be comparing the differences between two pairs of reactions ^.^
    (a-b)-(c-d) if greater than 0 the difference between the first pair is larger etc
    Haha, thanks! This is why I'll stick to maths, ygm
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    Also i have to convert 200 pF to standard form written to 1 decimal place, is the answer 2.0*10^-14?
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    (Original post by p29)
    also i have to convert 200 pf to standard form written to 1 decimal place, is the answer 2.0*10^-14?
    2.0*10^-10F
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    (Original post by ValerieKR)
    2.0*10^-10F
    thanks
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    This exercise is testing your understanding of physical quantities ("mass", "current") and their corresponding units ("kg", "A").

    It makes sense to add 1 kg to 1 kg, or 1 A to 1 A, but makes no sense to add 1 kg to 1 A, because the result would not be a mass or a current.

    The most important thing is that every physical quantity must have a unit. So every time you see a number without a unit, make an alarm bell go off in your head. 2.0*10^-14? 2.0*10^-14 whats? 2.0*10^-14 Farads, microFarads, apples, leprechauns? Without the unit, it's just a number with no obvious physical meaning.
 
 
 
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