Test analysis: subtract the mass of water from the total mass of water and beaker, and calculate the volume of water by formula; The mass of snow should be subtracted from the total mass of snow and cups, and the volume of snow is the same as that of the first water. The density of snow should be calculated by the density formula. The total weight of snow should be multiplied by g, and the mass of snow should be calculated by the formula m = ρ v.
Mass of water =200g+20g+2g-22g=200g, volume of water;
The mass of the snow sample = 102g-22g=80g, the volume of the snow sample is 200cm 3, and the density of the snow; Total weight of snow on the roof G=mg=ρ snow VG = 0.4×103kg/m3× 30m3×10n/kg =1.2×105n. Test center:
Comments: This question should pay attention to reading the indicator of the balance correctly, using the same volume twice, and finding the density of snow according to the density formula. When calculating the final gravity, we should use the gravity formula and pay attention to the unity of units.