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(20 12? The density of small stones is measured by a military adjustment tray balance. When the balance is balanced, the weight and stray code in the right plate are on the scale.
As can be seen from the figure, the scale value of the scale is 0.2g, and the mass of the object is m = 50g+2g = 52g.

The scale value of the measuring cylinder is 1ml, in which the volume of water is 20ml, and the volume and volume of water are 40ml, so the volume of small stone is V=40ml-20ml=20ml=20cm3.

So the density of small stones is; ρ= mV = 52g 20 cm3 = 2.6g/cm3 = 2.6× 103kg/m3

So the answer is: 52; 20; 2.6× 103.

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