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

[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