$1\frac{oz}{i{n}^2}=0\mathrm{.}1273inHg$

$1bbl=5\mathrm{.}6146f{t}^3$

$1inHg=3386\mathrm{.}3887Pa$

$1f{t}^2=0\mathrm{.}09290m^2$

$1$ day $=86,400s$

Use all the given conversion to solve the problem.

Here are some steps to get started

$P1=$ given

$V1=$

$P2=P1-$ deltaP$($given$)$

$V2=$

$\frac{V2-V1}{q}=$ deltat

question: $.$ A storage tank has a diameter of $80$ ft$,$ a height of $25$ ft$,$ and contains oil to a height of $15$ ft$.$ The suction pumps, which can handle $15,000$ bbl$/$d$,$ are started, but the safety valves are clogged and a vacuum is drawn in the tank. The roof is flat and rated to withstand $1\mathrm{.}0$ oz$/$sq in$.$ before collapsing. The barometric pres$-$ sure is $30$ in Hg$.$ How long will it take the tank to collapse? What is the total force on the roof at collapse? How would more oil in

the tank have affected the collapse time? Explain