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Уважаемые эксперты! Пожалуйста, ответьте на вопрос: Человек массой M=60 кг равномерно поднимает груз массой m=50 кг при помощи системы идеальных блоков и нитей. Определите, с какой силой он действует на пол, на котором стоит. Ответ дайте в Н, округлив до целого числа. Ускорение свободного падения g=10 Н/кг.
Груз какой максимальной массы может поднимать этот человек при помощи такой системы блоков? Ответ дайте в кг, округлив до целого числа.
1) 2*T=m*g -> T=m*g/2 2*T'=T -> T'=T/2=m*g/4. F=M*g -> P=F+m*g/4=g*(M+m/4)=10*(60+12.5)=725 Н. 2) max m -> P=0. F=m*g/4 <-> M*g=m*g/4 -> m=4*M=4*60=240 kg. Ответ: 1) 725 Н. 2) 240 кг.
Вы правильно вычислили выигрыш в силе системы блоков. Выигрыш n = 2*2 = 4 дают т-ко 2 правых по рисунку блока. Но Ваша строка "F=M*g -> P=F+m*g/4=g*(M+m/4)=10*(60+12.5)=725 Н" - ошибочна, потому что сила Fk натяжения каната над человеком и вес M*g человека - противо-направлены.
"с какой силой он действует на пол, на котором стоит" - M*g - Fk = M*g - m*g / 4 = 60*10 - 50*10 / 4 = 600 - 125 = 475 Н "Груз какой максимальной массы может поднимать этот человек" - M*n = 60*4 = 240 кг . Исправьте свои вычисления в минифорум-посте и просите модераторов скопировать Вашу правку в Ваш ошибочный Ответ.
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