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# Maths year 11

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1. (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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2. (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
3. (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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6. (Original post by z_o_e)
I need to learn the method for this :/

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1km doesn't equal 100cm

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
7. (Original post by 34908seikj)
1km doesn't equal 100cm

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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8. (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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9. (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
10. (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.
11. (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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12. (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.
13. (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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14. (Original post by z_o_e)
Oh ha ha. Tried this. This seems incorrect.

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

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

Also how do I do the last rocket question

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17. (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

18. (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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19. (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, where h is the length.
20. I got the top ones. I think they are right. What about these?

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