Question

In the diagram the area of cross section of the pistons $A$ and $B$ are $8{cm}^2$ and $320{cm}^2$ respectively then the thrust on the piston at $B$ is

• A. $160kgf$
• B. $320kgf$
• C. $420kgf$
• D. $80kgf$

Answer 1

The correct option is A $160kgf$

$A_1=8{cm}^2{A}_2=320{cm}^2$

$F_1=4kgf{F}_2=xN$

Since $\frac{F_1}{A_1}=\frac{F_2}{A_2}\Rightarrow \frac{x}{320}=\frac{4}{8}$

$x=160kgf$