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Уважаемые эксперты! Пожалуйста, ответьте на вопрос: Петров и Васечкин нашли четыре одинаковые упругие верёвки. Когда мальчики повисли — каждый на одной из верёвок — то верёвка Васечкина растянулась на ?lВ=3,5 см, а верёвка Петрова — на ?lП=2,5 см. Взяв лёгкую, но достаточно прочную доску, Вася и Петя подвесили её за угловые точки на всех четырёх верёвках и уселись на доску, не касаясь ногами земли. При этом верхние концы верёвок были закреплены на одной высоте, а доска была горизонтальна. Чему будет равно удлинение каждой из верёвок? Ответ запишите в см, округлив до десятых.
Условие : Удлинение верёвки от веса Васечкина [$916$]В = 3,5 см ; Удлинение верёвки от веса Петрова [$916$]П = 2,5 см . Вычислить удлинение [$948$] каждой из 4х верёвок над доской.
Решение: Свойства упругих верёвок подчиняются простому закону Гука : "Сила упругости возникающая при деформации тела, прямо пропорциональна абсолютному удлинению тела и направлена в сторону, противоположную направлению смещения частиц тела: Fx = -k·х . Здесь Fx - проекция силы на ось ОX, k - жёсткость тела, зависящая от размеров тела и материала, из кот-го оно изготовлено" (учебник "Физика в средней школе" Аксенович, Ракина, §2.8)
Применим этот закон к текущей задаче, свяжем исходные данные мат-формулами: PВ = -k·[$916$]В PП = -k·[$916$]П , здесь PВ и PП - вес Васечкина и Петрова соответственно. Коэффициент жёсткости k одинаков для обеих формул, потому что в Условии заданы "одинаковые упругие верёвки".
Мальчики могли сесть на доску многими способами (ближе к к-либо концу, посредине…) и перекосить доску растяжением верёвок в любую сторону. Но согласно Условию "верхние концы верёвок были закреплены на одной высоте, а доска была горизонтальна". Значит, более тяжёлый Васечкин сел ближе к центру доски, и все 4 верёвки растянулись равномерно-одинаково по закону (PВ + PП) / 4 = -k·[$948$]
Откуда искомое удлинение [$948$] = [(PВ + PП) / 4] / (-k) = (PВ + PП) / (-4·k) = (-k·[$916$]В + -k·[$916$]П) / (-4·k) = ([$916$]В + [$916$]П) / 4 = (3,5 + 2,5) / 4 = 6/4 = 3/2 см. Ответ : удлинение каждой из верёвок равно 1,5 см.
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