Question
A 400-kg concrete block is 1 m long, 0.6 m wide, and 0.3 m high. Its density is
A 400-kg concrete block is 1 m long, 0.6 m wide, and 0.3 m high. Its density is
A. 72 kg/m3
B. 222 kg/m3
C. 667 kg/m3
D. 2222 kg/m3
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Koala Tutor
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The density of an object is its mass divided by its volume. The volume of a rectangular prism (like this concrete block) is its length times its width times its height. So the volume of this block is 1 m * 0.6 m * 0.3 m = 0.18 m^3. Therefore, the density of the block is 400 kg / 0.18 m^3 = 2222 kg/m^3. So the answer is D. 2222 kg/m^3.
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