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Консультация № 201337
12.08.2021, 16:44
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Здравствуйте! У меня возникли сложности с таким вопросами:
Две одинаковые длинные тяжелые однородные доски лежат (одна на другой) на горизонтальной поверхности. Резким ударом нижней доске сообщили начальную скорость 6 м/с, направленную точно вдоль досок. Доски до самой остановки движутся поступательно. Ускорение свободного падения считайте равным 10 м/с2.
За какое время проскальзывание досок друг по другу прекратится, если коэффициент трения между досками и коэффициент трения между нижней доской и поверхностью одинаковы и равны 0,5? Ответ выразите в секундах, округлив до десятых.
За какое время после сообщения нижней доске начальной скорости движение досок прекратится полностью? Ответ выразите в секундах, округлив до десятых.
Небольшое тело запускают вверх вдоль наклонной плоскости, наклонённой под углом ?=30? к горизонту, со скоростью v0=5 м/с. Коэффициент трения между телом и плоскостью ?=0,5. Тело не покидает плоскость, ускорение свободного падения считать равным g=10 м/с2.
Какое время должно пройти, чтобы величина скорости тела снова стала равна начальной? Ответ выразите в секундах, округлив до целого числа.
На каком расстоянии от начальной точки будет находиться тело в этот момент времени? Ответ выразите в метрах, округлив до целого числа.
Две одинаковые длинные тяжелые однородные доски лежат (одна на другой) на горизонтальной поверхности. Резким ударом нижней доске сообщили начальную скорость 6 м/с, направленную точно вдоль досок. Доски до самой остановки движутся поступательно. Ускорение свободного падения считайте равным 10 м/с2.
За какое время проскальзывание досок друг по другу прекратится, если коэффициент трения между досками и коэффициент трения между нижней доской и поверхностью одинаковы и равны 0,5? Ответ выразите в секундах, округлив до десятых.
За какое время после сообщения нижней доске начальной скорости движение досок прекратится полностью? Ответ выразите в секундах, округлив до десятых.
Небольшое тело запускают вверх вдоль наклонной плоскости, наклонённой под углом ?=30? к горизонту, со скоростью v0=5 м/с. Коэффициент трения между телом и плоскостью ?=0,5. Тело не покидает плоскость, ускорение свободного падения считать равным g=10 м/с2.
Какое время должно пройти, чтобы величина скорости тела снова стала равна начальной? Ответ выразите в секундах, округлив до целого числа.
На каком расстоянии от начальной точки будет находиться тело в этот момент времени? Ответ выразите в метрах, округлив до целого числа.
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