IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Math => Topic started by: Rozalin on December 28, 2009, 02:42:41 pm

Title: Calculus question help!!!!!!!!!!!!!!!!!!!!
Post by: Rozalin on December 28, 2009, 02:42:41 pm

Sorry I ask too many questions :$ :-[
Can anyone solve this problem attached
Q8 from January 2008 c4 edexcel paper..
thanksssss aloooot

Title: Re: Calculus question help!!!!!!!!!!!!!!!!!!!!
Post by: astarmathsandphysics on December 29, 2009, 12:36:45 am

Will answer when I get up

Title: Re: Calculus question help!!!!!!!!!!!!!!!!!!!!
Post by: nid404 on December 29, 2009, 05:06:39 am

Here u go

dv/dt=1600
emptying given in dh/dt=k rooth

so in this case the rate at which the height of the cylinder increases would be given by

h=1600/4000(area of cross-section)- kroot h

dh/dt= 0.4-krooth

when u take rate=400cm3
h=400/4000=0.1 since h=25
0.1=5k
k=0.02

If you can check the ms for the last 2 ans...im not sur abt mine.....

Title: Re: Calculus question help!!!!!!!!!!!!!!!!!!!!
Post by: astarmathsandphysics on December 29, 2009, 09:52:18 am

Thanks nid