Question $7$

$4$ pts

A $1,865kg$ car on a hydraulic lift rests on a cylinder with a piston diameter of $0\mathrm{.}7$ m $.$ If a connecting cylinder with a piston of $0\mathrm{.}05$ m diameter is driven by compressed air, what force in Newtons must be applied to this smaller piston in order to lift the car?

Question $8$

$4$ pts

A copper wire of length $4\mathrm{.}8$ m $,$ cross sectional area $4{10}^{-6}{m}^2$ and Young's modulus $11{10}^{10}\frac{N}{m^2}$ has a $842$ kg load hung on it$.$ What is its increase in length? $(g=9\mathrm{.}8\frac{m}{s^2})$