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### Question 8.3

Posted: **Fri Jan 12, 2018 2:23 pm**

by **Manasvi Paudel 1A**

hey guys !

for question 8.3, how do we know that delta V is pi*r^2*d? is it just because we're assuming the bicycle pump is a cylinder ?

### Re: Question 8.3

Posted: **Fri Jan 12, 2018 2:40 pm**

by **Sarah Rutzick 1L**

Yes, since the equation to find work is w=-PdeltaV, we know we need to use the volume of the pump which we can assume to be a cylinder. The equation we use for volume would vary by problem and the container we're working with.

### Re: Question 8.3

Posted: **Fri Jan 12, 2018 2:55 pm**

by **Katie Lam 1B**

Since the question noted that there was an inner diameter, you can assume that it is referring to a cylinder.