JAMB - Physics (2019 - No. 85)
A rectangular solid block has length 10cm, breadth 5cm and height 2cm. If it lies on a horizontal surface, and has density 100kg/m\(^3\), calculate the pressure it exerts on the surface.
20 N/m\(^2\)
100 N/m\(^2\)
400 N/m\(^2\)
300 N/m\(^2\)
Giải thích
| P | = | F
A |
= | mg
A |
= | (ρ × v) × g
A |
= | ρ × (A × h) × g
A |
P = 100 × 2 × 10\(^{-2}\) × 10 = 20 N/m\(^2\)