Determine the density of the substance from which a rectangular bar weighing 78 g is made if its length is 1.0 dm, width is 2.0 cm, and height is 0.50 cm.
We find out how many cm3 the volume of the specified bar will correspond to, when it is known that its length is 1 dm, the width is 2 cm, while its height is 0.5 cm:
1 decimeter – this will be the same as 10 centimeters;
10 * 2 * 0.5 = 20 * 0.5 = 10.
As we know from the school curriculum in physics, the density of a substance can be calculated through the ratio of the mass of an object to its volume.
Let’s determine the density of the substance from which this bar is made:
78: 10 = 7.8.
Answer: 7.8 g / cm3.
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