A simple hydraulic jack can be built that does not need a pump, or even a second piston. As shown in the sketch, the jack consists of a large$-$diameter cylinder$/$piston on the right side that lifts the heavy weight, $W,$ and nothing but a tall tube on the left side into which

oil can be poured. The idea is to use the hydrostatic pressure force $("$head$")$ of the oil in the tube on the left side to lift the weight on the right side.

$($a$)$ Ignoring friction in the piston$/$cylinder$,$ ignoring the weight of the piston compared to $W,$and assuming no oil leakage, generate an expression for the oil height $h$ required to just start lifting the weight. Your expression should be $h$ as a function of the other variables

as needed.

$($b$)$ To start lifting a car that has a mass of ${120}_{0}kg,$ calculate $h$ in m if ${}_{\text{o}\text{i}\text{l}}=653k\frac{g}{m^3},D_2=0\mathrm{.}805$ m $,$ and $D_1=2\mathrm{.}04cm.$ This is all one question answer each part please.