Answer:
Explanation:
Given
mass of textbook [tex]m=1 kg[/tex]
area of contact [tex]A=25 cm^2\approx 25\times 10^{-4} m^2[/tex]
Pressure is given by  perpendicular force to an area.
[tex]P=\frac{Force}{Area}[/tex]
[tex]P=\frac{mg}{A}[/tex]
[tex]P=\frac{1\times 9.8}{25\times 10^{-4}}[/tex]
[tex]P=3.92 KPa[/tex]
(b)If pressure is increased then it will have no effect because pressure applied is same in all direction.
