Question

Please help me, I am confused

Answer 1

its very easy u have given force applied on area of A and B nail .hope u get the answer. if not thrn ask me.

Answer 2

Pressure=Force/Area

$\frac{1.5N}{2mm^2}$

1N/ mm²=1MPa(Mega pascal)

So:

Pressure=$0.75MPa$

=$7.5*10^5Pa$

Similarly

$\frac{1.5N}{6mm^2}$

1N/ mm²=1MPa(Mega pascal)

Pressure=$0.25MPa$

=$2.5*10^5Pa$

Hope it helps you.