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Calculus question help!!!!!!!!!!!!!!!!!!!!

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

astarmathsandphysics:
Will answer when I get up

nid404:
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.....

astarmathsandphysics:
Thanks nid

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