Question

calculate the pressure exerted by ball falling on the Earth if mass is equal to 50 gram and spherical having radius is equal to 5 cm

Answer 1

mass of ball,m = 50g = 0.05 kg
radius of spherical ball, r = 5 cm = 0.05m
surface area of spherical ball , A = 4πr²
= 4 × 3.14 × (0.05)²
= 4 × 3.14 × 25 × 10^-4
= 3.14 × 10^-2 m²

now, pressure = weight of ball/surface area of ball
= (0.05 × 10)/(3.14 × 10^-2)
= 15.9N/m²

Answer 2

F = 50g = 50/1000 = 1/20 kg

= 1/20 × 10 = 1/2 N

r = 5 cm = 5 /100 = 1/20 m

Area = 4pie( r)2 = 4 × 22/7 × 1/20 ×1/20 = 11/350

P = F/A = 1/2/11/350

= 1/2× 350/11

= 175/11

= 15.99 Nm