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An upturned cone of semi-vertical angle 45° is being filled with water at a constant rate of 20cm3 /s. Find the rate at which the height of the water, the area of the water surface, and the area of the cone wetted by the water, are increasing when the water height is 50 cm. can i get help with...

Thanks!

I have no idea how to even approach e or f. any help?

thank you very much! Is this from the official solutions?

Could I get some help with b please? thanks

aaaah ok. thanks m8

I've gotten the first part of the question, but its the last bit that I stumble with. I followed the same steps to solve it but to no avail... Any help??

But @Masaken why do you take the cosalpha out only? can't you take any of the other terms out like sin5alpha? Would that be right?

aaak ok. thanks m8

For this one, I am struggling with b. Could I have some help please?

Tysm m8

I've gotten parts a and b but I do not know how to apply them to c. Could anyone pls help???

tysm!

Hello BoS, I don't know how to continue with the question; could I get some help? I keep getting weird polynomial errors and it's been 20 minutes ;-;

yesssss dude thank you so much!

I've nailed part a but how do I start part b??? Cheers, yellowhighlighterr

I want to study Astrophysics at Cambridge but am not doing any extra-curriculars regarding it besides reading books on the subject or a few documentaries here or there. Does that tarnish my chances? I'm in Year 11 right now; should I pick something up? Are extracurriculars important for...

aaaaaah ok. Thanks m8. Could u also help me out w/ this one:

So I need help with 7a. I've managed to do all of 6, but can't seem to apply it to 7. Any help will be much appreciated!

if my answer deviates from (or is shorter/longer than) the suggested response/sample answers for a past paper (biology specifically), but it makes sense and i think that is should be correct, do I still got the mark??? cheers, yellowhighlighterr