Предмет: Физика, автор: gilmanovaarina49

Какую силу нужно приложить, чтобы кусок гранита объёмом 40 дм^3 удержать в воде, в воздухе?

Ответы

Автор ответа: zinovicgrigorij

Ответ: 640Н

Объяснение:

Дано:

V=40дм³=0,04м³

ρ=2600кг/м³

------------------

Fт-?; Fa-?; ΔF-?

Сила тяжести в воздухе:

Fт=ρgV=2600*10*0,04=1040Н

Cила Архимеда:

Fa=ρ1*g*V=1000*10*0,04=400Н

Сила тяжести в воде:

ΔF=Fт-Fa=1040-400=640Н

o1enka: а в воздухе чему будет равно?

o1enka: 1039?

zinovicgrigorij: Сила тяжести в воздухе:

Fт=ρgV=2600*10*0,04=1040Н

o1enka: спасибо

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