As shown in the figure, half of the square metal block with a side length of 0.1M is placed on the horizontal table with an area of 1m2, and the size of the metal block is small As shown in the figure, half of the square metal block with side length of 0.1M is placed on the horizontal tabletop with an area of 1m2, and the density of the metal block is 5 × 103kg / m3. When the pressure of the metal block on the tabletop is 4 × 103pa, the indication of the spring dynamometer is n.

0.1*0.05=0.005m^2 4*10^3*0.005=20N 5*10^3*0.1^3=5kg 5*10-20=30N

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