Предмет:
ФизикаАвтор:
milagrosblankenshipОтвет: 801
Объяснение:
ρ = 1920 кг/м³
а = 25 см = 0,25 м
b = 12 см = 0,12 м
c = 6,5 см = 0,065 м
m = 3 т = 3000 кг
------------------------------------
N - ?
Решение:
m0 = ρV0
Где m0 - масса одного кирпича
V0 - объем одного кирпича
Также мы знаем что
V0 = abc
Тогда m0 = ρabc
Т.к. m = Nm0
Значит
N = m/m0
N = m/( ρabc )
N = 3000/( 1920 * 0,25 * 0,12 * 0,065 ) ≈ 801,25
Отсюда получаем целое число равное 801
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