JEE Main 2024 Physics question
Mercury is filled in a tube of radius 2 cm up to a height of 30 cm. The force exerted by mercury on the bottom of the tube is N. (Given, atmospheric pressure = 10 Nm, density of mercury = 1.36 × 10 kg m, g = 10 ms, π = 22/7)
Answer: 177
Solution
P = 10⁵ + 1.36 × 10⁴ × 10 × 0.3 = 1.408 × 10⁵ Pa; A = π(0.02)² = 1.257 × 10⁻³ m²; F = PA ≈ 177 N.