2po
Q 2. A lady weighing 80 kg is
standing on pencil heels, each
having an area of 5 cm?
Calculate the pressure exerted
by the girl on the ground.
Answers
Given : A lady weighing 80 Kg is standing on pencil heels, each having an area of 5 cm².
To Find : Calculate the pressure exerted by the girl on the ground
Solution:
Lady weight = 80 kg
m = 80 kg
Force = mass * acceleration
a = g = 10 m/s²
Force by Lady = 80 * 10 = 800 N
pencil heels, each having an area of 5 cm²
As there are 2 pencil heels
Total area = 2 * 5 = 10 cm²
1 cm = 1/100 m = 10⁻² m
1 cm² = (10⁻²)² = 10⁻⁴ m²
Total area = 10 * 10⁻⁴ = 10⁻³ m²
Pressure = Force / Area
= 800 / 10⁻³
= 800 * 10³ N/m²
= 800 k N/m²
= 800 k Pa
= 800000 Pa
pressure exerted by the girl on the ground = 800000 Pa
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