A junior high school physics problem about stress

Solution: let the mass of each brick be m and the bottom area be s.

Then the pressure on the horizontal ground is p=F/S=2mg/S=4000 Pa.

Pennsylvania ∴mg/S=2000.

1, the pressure on the brick BP' = f'/s' = mg/[(1-1/3) s] =1.5mg/s =1.5× 2000pa =

2. Let the density of bricks be ρ and the volume of each brick be V. ..

p = f/s = 2mg/s = 2ρVG/s = 2ρHg = 2ρ×0. 10m× 10n/kg = 4000 Pa。

∴ρ=2× 10? Kilogram/meter? .

Answer: The pressure of brick B is 3000 Pa and the density of brick B is 2× 10? Kilogram/meter? .