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Консультация № 190581
21.02.2017, 12:15
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос: помогите решить задачу. На дне лифта лежит тело массой m. Чему равна сила реакции R , приложенная к телу со стороны лифта:a) при его равномерно движении вниз со скоростью V?
b) при его подъеме вверх с ускорением a?
b) при его подъеме вверх с ускорением a?
Обсуждение
21.02.2017, 12:32
общий
это ответ
Здравствуйте, Vladislav Prisekin!
Решение:
В случае движения вниз формула следующая:
R1= m∙(g – a), но ускорение равно 0, поэтому R1=m*(g-0)=mg
Вес тела (оно же равно силе реакции опоры) при вертикальном движении с ускорением направленным вверх рассчитывается формуле:
R2 = m∙(g + a),
Решение:
В случае движения вниз формула следующая:
R1= m∙(g – a), но ускорение равно 0, поэтому R1=m*(g-0)=mg
Вес тела (оно же равно силе реакции опоры) при вертикальном движении с ускорением направленным вверх рассчитывается формуле:
R2 = m∙(g + a),
5
Об авторе:
С уважением, Александр.
С уважением, Александр.
21.02.2017, 14:49
общий
Извините пожалуйста , забыл еще один вариант : При свободном падении лифта ?
21.02.2017, 15:19
общий
Адресаты:
Да, при свободном падении лифта сила реакции равна нулю.
Об авторе:
Facta loquuntur.
Facta loquuntur.
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