Предмет: Физика, автор: irka1203

1) Тело массой 0.1 кг брошенной вертикально вверх со скоростью 50м/с достигло верхней точки подъема за 2.5 с. Определите среднее значение силы сопротивления воздуха

Ответы

Автор ответа: UmbertoVargas
0
определим высоту, которой достигло тело

H = v0 t - (g t²)/2 = 50*2.5 - 5*2.5^(2) = 93.75 м

по закону сохранения энергии

(m v0
²)/2 = Fсопр H + mgH

m v0² = 2 Fсопр H + 2 mgH

Fсопр = (m v0² - 2 mgH)/(2H)

Fсопр = (m v0²)/(2H) - mg (можно еще массу вынести, ну да ладно)

Fсопр = (0.1*50^(2))/(2*93.75) - 1 ≈ 0.4 H

тогда ее среднее значение равно 0.2 Н
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