Current Year 13 thread Mark I (2014-2015)

Decided today if I don't get an offer from one of the Scottish unis then I'm not going to uni next year...scary stuff.

Reply 7841

_Caz_

10

Original post by strawberrysnow

Can someone help me integrate this please? This is my working out but my answer is different from the book. It's c4 volumes of revolution. Thank you very much! :smile:

Does this help? :smile:

Edit: BTW I just integrated what you had at the top is that what you wanted?

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Reply 7842

Original post by _Caz_

Does this help? :smile:

Edit: BTW I just integrated what you had at the top is that what you wanted?

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Thank you so so much!! :biggrin:

Reply 7843

_Caz_

10

Original post by strawberrysnow

Thank you so so much!! :biggrin:

No problem :smile:

Reply 7844

Original post by emcat

Decided today if I don't get an offer from one of the Scottish unis then I'm not going to uni next year...scary stuff.

What's wrong with England? :tongue:

Reply 7845

username738914

Original post by _Caz_

Does this help? :smile:

Edit: BTW I just integrated what you had at the top is that what you wanted?

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Exactly what I got, you beat me to it! :smile:

Reply 7846

emcat

Original post by Red Fox

What's wrong with England? :tongue:

Well...

Nah, I just haven't liked any uni I've seen or been to other than the Scottish ones. Just have the slight issue that I haven't been accepted to either of them I've applied to yet.

Reply 7847

Original post by emcat

Well...

Nah, I just haven't liked any uni I've seen or been to other than the Scottish ones. Just have the slight issue that I haven't been accepted to either of them I've applied to yet.

Fair enough, good luck. Which Scottish unis are they then?

Reply 7848

_Caz_

10

Original post by Princepieman

Exactly what I got, you beat me to it! :smile:

Haha. Glad we got the same. Was afraid I'd made a silly sign error or something. :smile:

Reply 7849

Sorry to bother people again but can someone help me with this question? It's volumes of revolution (c4) again.

I just don't really know how to approach this problem - I tried integrating m^2x^2 but that ended up in a bit of a mess...

Thanks again! :smile:

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Reply 7850

Original post by strawberrysnow

Sorry to bother people again but can someone help me with this question? It's volumes of revolution (c4) again.

I just don't really know how to approach this problem - I tried integrating m^2x^2 but that ended up in a bit of a mess...

Thanks again! :smile:

You're on the right track but you need to write m in terms of r and h and you would need to integrate between the limits of h and 0.

Reply 7851

username738914

Original post by strawberrysnow

Sorry to bother people again but can someone help me with this question? It's volumes of revolution (c4) again.

I just don't really know how to approach this problem - I tried integrating m^2x^2 but that ended up in a bit of a mess...

Thanks again! :smile:

Find an equation that puts the gradient in terms of r and h

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Reply 7852

Original post by Red Fox

You're on the right track but you need to write m in terms of r and h and you would need to integrate between the limits of h and 0.

Original post by Princepieman

Find an equation that puts the gradient in terms of r and h

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Thank you! So something like this (I hope)? But how do you integrate when there are 3 different letters/variables??

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(edited 9 years ago)

Reply 7853

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Reply 7854

Original post by strawberrysnow

r and h aren't variables, they're just the coordinates so they are constants in this case. You only need to integrate with respect to x.

Reply 7855

username738914

Original post by strawberrysnow

Thank you! So something like this (I hope)? But how do you integrate when there are 3 different letters/variables??

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You integrate with respect to x

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Reply 7856

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