Question from independent paper (1 Viewer)

[Merlin]

I cant remember the ?? exactly but it was the growth and decay question involving a cone, how was I s'posed to do that??? Sorry that I cant remember exactly but with all the exams going on its a bit hard!! Thanks

 

[Nelly]

You get a relationship between the height and the radius. I think it was something like:

r/h=8/10

Then plug that information into the equation V=1/3pi*r^2*h.

Then you can find dv/dh and dv/dr.

I think the question was asking for dv/dh, so you plug in (r=8h/10) Then voila, you have an equation for dv/dt and dv/dh. Then you can find dh/dt using the chain rule

 

[Merlin]

Thankyou it all makes sense now, but boy did I stuff that exam up, Our whole class got a lecture today about our appalling marks in the 2U paper, mine is too disgraceful to say, and I havent got the EX1 paper back, I hope they burn it!!!!!!!!!!!!