A block of foam rubber has a mass of 90 g, determine the mass of 1 m3 of foam rubber in kilograms
A block of foam rubber has a mass of 90 g, determine the mass of 1 m3 of foam rubber in kilograms, the dimensions of a block are 10 cm. 15 cm. 20 cm.
Let us express the dimensions of the bar in meters:
1 m = 100 cm;
10 cm = 10: 100 = 0.1 m;
15 cm = 15: 100 = 0.15 m;
20 cm = 20: 100 = 0.2 m.
Let’s find the volume of the bar:
0.1 * 0.15 * 0.2 = 0.015 * 0.2 = 0.003 m3 – the volume of the foam rubber bar.
Let’s express the mass of a foam rubber bar in kilograms:
1 kg = 1000 g;
90 g = 90: 1000 = 0.09 kg – the mass of the foam rubber bar.
Let’s make a proportion, expressing through x the mass of 1m3 of foam rubber:
0.003m3 – 0.09 kg;
1m3 – х.
x = 1 * 0.09: 0.003;
x = 0.09: 0.003;
x = 30 kg – weight of 1m3 foam rubber.
Answer: the weight of 1m3 foam rubber is 30 kg.