# Thread: Finding rate of change of volume in a cylinder.

1. ## Finding rate of change of volume in a cylinder.

I've attached a picture to make things easier to read.

The rate I got sounds absurd, and it doesn't take the "3 seconds" into consideration.

Did I do something wrong? Any help would be greatly appreciated.

2. ## Re: Finding rate of change of volume in a cylinder.

your calculation of dV/dt is correct, except for your units ... the time does not matter since dV/dt = k(dh/dt)

3. ## Re: Finding rate of change of volume in a cylinder.

Originally Posted by skeeter
your calculation of dV/dt is correct, except for your units ... the time does not matter since dV/dt = k(dh/dt)

mm^3 / sec since it's volume, my bad.

Thank you!

4. ## Re: Finding rate of change of volume in a cylinder.

your answer is fine except that the units are $mm^3 / sec$

im not sure why 3 seconds is mentioned in the question to be honest, as ther ate of change will be constant provided the candy continues to move at 7mm/sec.

edit: i was too slow :P

5. ## Re: Finding rate of change of volume in a cylinder.

Originally Posted by SpringFan25
your answer is fine except that the units are $mm^3 / sec$

im not sure why 3 seconds is mentioned in the question to be honest, as ther ate of change will be constant provided the candy continues to move at 7mm/sec.
I wondered the same, I guess it's just added to "throw off" people.