К однородному цилиндрическому проводнику, изготовленному из неизвестного сплава, длиной 10 м приложили разность потенциалов 10 В. Через 1 мин проводник начал плавиться. Определите удельную теплоемкость проводника, если его удельное сопротивление 3,4·10-8 Ом·м, плотность 7500 кг/м3, температура плавления 800 °С. Начальная температура проводника 20 °С.
Как я поняла то вот так:
Объяснение:
Дано :
р = 400 кПа = 400000 Н
F2 ( сила действующая на меньший поршень ) = 200 Н
S1 ( площадь большего поршня ) = 0,04 м²
—
а ) F1 - ?
б ) ( S1 ) / ( S2 ) - ?
p = const = 400000 Н
р = F / S
F = pS
S = F / p
а ) F1 ( сила действующая на больший поршень ) = p * S1
F1 = 400000 * 0,04 = 16000 Н
б ) S2 ( площадь меньшего поршня ) = F2 / p
S2 = 200 / 400000 = 0,0005 м²
выигрыш в силе равен отношению площадей большего к меньшему поршней
выигрыш в силе = S1 / S2
выигрыш в силе = 0,04 / 0,0005 = 80 раз
ответ : а ) 16000 Н = 16 кН
б ) 80 раз
❤️
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Объяснение: