Question 8.3

[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 ?

[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.

[Katie Lam 1B]

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