Предмет: Физика, автор: mischelbenis

5. В соревнованиях по перетягиванию каната участвуют четверо мальчиков. Влево тянут канат двое мальчиков с силами 530Н и 540Н соответственно, а вправо – двое мальчиков с силами 560Н и 520Н соответственно. В какую сторону, и какой результирующей силой перетянется канат?

6. При действии на опору силой 20Н давление на нее оказывается в 200Па. Во сколько раз изменится давление, если на опору действовать с силой 40Н?
А. Увеличится в 2 раза; Б. Уменьшится в 2 раза; В. Увеличится в 10 раз; Г. Не изменится.
7. При поднятии груза весом 260Н с помощью подвижного блока на веревку действовали с силой 136Н. Каков вес блока?

Решение напишите,пож.

Ответы

Автор ответа: danilsadovnikov

5) F1=530Н+540Н
F2=560H+520H
F1=1070H
F2=1080H
Результирующая равна F2-F1=10H, перетянет вправо.
6)P=F:S
S=F:P
S=0,1м²
P2=F2:0,1м²
P2=400H
Ответ в 2 раза.

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