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A rectangular iron block with a length of 10 cm, a width of 8 cm and a height of 5 cm is melted and cast into a cylindrical iron block with a diameter of 20 cm, and the height of the cylindrical iron block is calculated
The volume of cuboid is: 10 × 8 × 5 = 400 cubic centimeter, while the ground diameter of cylinder is 20 cm, so the bottom area of cylinder is: 3.14 × 10 × 10 = 314 square centimeter. While the total volume of iron remains unchanged, so the height of cylinder is: 400 △ 314 ≈ 1.274 cm
There is a kind of brick with a thickness of 5cm and a density of 2.5 × 10 ~ (- 179); kg / M ~ (- 179); when it is placed on a horizontal plane, what is the pressure on the ground?
With this kind of brick wall, regardless of the cement mortar between bricks, with the maximum pressure of 4.35 times the fifth power of 10, how high can the wall be built at most?
p=F/s=G/s=mg/s=2.5×10³ vg/s=2.5×10³ shg/s=2.5×10³ hg=2.5×10³ *0.05g=125g
g=10
p=1250
The pressure of a regular object on the ground = pGH P is the density
h=4.35*10^5/ 2.5×10³*10
=43.5/2.5
=17.4m
A brick with thickness of 5cm and density of 2.5 * 10 & # 179; kg / M & # 179; is laid flat on the horizontal ground. As shown in the figure, what is its pressure on the ground?
P=mg/s=ρvg/s=ρshg/s=ρhg=2.5*10³kg/m³*5cm*9.8N/kg=1225Pa
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