Maths year 11

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    (Original post by gdunne42)
    You don't know that there are 100 cm in a m?
    or 1000 m in 1 km?
    So 100 x 1000 cm in a km


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    Thank you so much and no I don't.

    Can you list them all please so I cam memorise them?

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    (Original post by z_o_e)
    Thank you so much and no I don't.

    Can you list them all please so I cam memorise them?

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    https://en.wikipedia.org/wiki/Unit_prefix
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    (Original post by 34908seikj)
    Copper- 89.62 g/cm^3 - 14700 / 164

    Air - 15.38 m^3 - 20kg * 0.0013g/cm^3 then I just converted it into M^3, however it's probably easier to convert the 0.0013g/cm^3 in m^3 first.

    Edit: I did hydrogen wrong.
    I need to learn the method for this :/



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    Final answers



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    (Original post by z_o_e)
    I need to learn the method for this :/



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    1km doesn't equal 100cm


    Think about it like this.

    There are 1000 meters in a Kilometre
    And there is 100cm in 1 meter.
    Therefore there is 1000*100 cm in one km
    Which is 100000cm

    Now you want 1km^3

    1km^3 is 1km * 1km *1km

    So we can deduce that 1km^3 = 100000^3cm

    Which can be wrote as 1 * 10^15 cm^3

    or 1000000000000000cm^3
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    (Original post by 34908seikj)
    1km doesn't equal 100cm


    Think about it like this.

    There are 1000 meters in a Kilometre
    And there is 100cm in 1 meter.
    Therefore there is 1000*100 cm in one km
    Which is 100000cm

    Now you want 1km^3

    1km^3 is 1km * 1km *1km

    So we can deduce that 1km^3 = 100000^3cm

    Which can be wrote as 1 * 10^15 cm^3

    or 1000000000000000cm^3
    How's this?

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    (Original post by z_o_e)
    How's this?

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    I changed it to cm3

    And got this


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    (Original post by z_o_e)
    How's this?

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    eh you're off by a few 0's

    It's more in the realm of:

    900 000 000kg
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    (Original post by z_o_e)
    I changed it to cm3

    And got this


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    That's correct. Your unit of measurement is grams by the way.
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    (Original post by 34908seikj)
    That's correct. Your unit of measurement is grams by the way.
    Yaaayx

    This is the second question



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    (Original post by z_o_e)
    Yaaayx

    This is the second question



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    Looks correct - On phone (walking dog lol) so I can't actually confirm it's right though.
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    (Original post by 34908seikj)
    Looks correct - On phone (walking dog lol) so I can't actually confirm it's right though.
    Oh ha ha. Tried this. This seems incorrect.



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    (Original post by z_o_e)
    Oh ha ha. Tried this. This seems incorrect.



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    'Tis correct.
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    (Original post by 34908seikj)
    'Tis correct.
    Thank you so much ♥

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    (Original post by 34908seikj)
    'Tis correct.
    How did I do these?

    Also how do I do the last rocket question



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    (Original post by z_o_e)
    How did I do these?

    Also how do I do the last rocket question



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    I'll do the rocket question in a more visible colour.


    For the 10^1/10^-4 , while I didn't do it this say, since I think it's easier to understand by writing it out, for demonstration purposes. You can think of it as 10^1-(-4) = 10^5

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    (Original post by 34908seikj)
    I'll do the rocket question in a more visible colour.


    For the 10^1/10^-4 , while I didn't do it this say, since I think it's easier to understand by writing it out, for demonstration purposes. You can think of it as 10^1-(-4) = 10^5

    Got it!! I got 71% on that work!!

    Now this...



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    (Original post by z_o_e)
    Got it!! I got 71% on that work!!

    Now this...



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    Volume = area of cross section x length.
    So cylinders have volume,  V=\pi r^2 h where h is the length.
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    I got the top ones. I think they are right. What about these?



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