Предмет: Физика, автор: saryalibek2004

На стеклянное тело при полном его погружении в воду , действует выталкивающая сила равная 1,25 кН . Чему равен объем стеклянного тела . Плотность воды 1000 кг/м3
Варианты ответа
0,125 м3
1,25 м3.
125 см3
125 м3
Какое давление производит вагон массой 25 тонн на рельсы , если площадь соприкосновения всех колес вагона с рельсами равна 0,002 м2
Варианты ответа
125 МПа
500 МПА
50 Па
12,5 МПА
125. Па

Приложения:

Ответы

Автор ответа: lochgipon
3

Ответ:

125cm^3

125МПа

Объяснение:

1.По Формуле Fвыт=p*g*V

V=Fвыт/p*g=\frac{1,25}{10*1000} =0,000125=1,25*10^{-4}=125cm^3

2. 25 т=25000kg

По формуле p=F/S F=P=m*g

P=9,8*25000≈2,5*10^5≈250000

p=\frac{250000}{0,002} =125000000 Па=125МПа


anna2007lbvf: 125 см3 или 125 м3?
lochgipon: см3
anna2007lbvf: большое спасибо :3
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