Question

Numerical problems
1. A force of 20 N acts on a surface of area
70 cm². Calculate the pressure exerted on the
surface? numerical in physics
​

Answer 1

Solution :-

Given :-

• Force = 20 N
• Area = 70 cm² = 0.007 m²

To Find :-

• Pressure

Formula Used :-

• $\underline{\boxed{\pink{ \sf Pressure = \dfrac{Force}{Area}}}}$

Subsisting Values

$\sf \implies \dfrac{20}{0.007}$

$\sf \implies \dfrac{20}{7} \times 100$

$\sf \implies \dfrac{2000}{7}$

$\sf \implies 2857.14 \: (approx)$

Thus, 2857.14 Pa (approx)

Hence, Solved ♡

Answer 2

$\large\red{\underline{{\bf Given:- }}}$

• Force = 20 N
• Area = 70 cm²

$\large\red{\underline{{\bf To\:Find:- }}}$

• Pressure exerted on the surface.

$\large\red{\underline{{\bf Solution:- }}}$

Step 1 :-

${:⟹}$ Convert 70 cm² into m².

We know that,

${:⟹}$ 1 cm² = ${{\bf {10}^{ - 4} }}$${{\bf m^{ 2} }}$

So,

${:⟹}$ 70 cm² = 70 × ${{\bf {10}^{ - 4} }}$${{\bf m^{ 2} }}$

${:⟹}$ 0.007 m²

Step 2 :-

Find the pressure,

Formula :-

$\large\boxed{\underline{{\bf Pressure = force/area }}}$

${:⟹}$ 20/0.007

${:⟹}$ 20/7 × 100

${:⟹}$ 2000/7

${:⟹}$ 2857.14 ${{\bf {ms}^{ - 2} }}$