A rectangular piece of land measuring 20m by 30m must be evenly covered with a layer of sand (dry) 10cm thick.
| November 18, 2020 | education
A rectangular piece of land measuring 20m by 30m must be evenly covered with a layer of sand (dry) 10cm thick. How much sand should you bring?
Given:
a = 20cm = 0.2m
b = 30cm = 0.3m
s = 10cm = 0.1m
ρ = 1500kg / m ^ 3
m-?
Decision:
m = ρV
V = abc
V = 0.2m × 0.3m × 0.1m = 0.006m ^ 3
m = 1500kg / m ^ 3 × 0.006m ^ 3 = 9kg
Answer: 9kg
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