Предмет: Физика, автор: Senya92

СРОЧНО! 30 БАЛЛОВ!
воздушный шар массой 85 кг равномерно движется вниз чему равна сила сопротивления воздуха. можно с "дано" и с "решением"

Ответы

Автор ответа: h9h
12

Дано:   m=85 кг    а=0     Fсопр-?

Решение: Так как ускорение шара рано нулю, равнодействующая сил равна нулю. Направим ось Ох вертикально вниз, тогда в проекциях на неё можно записать

Fтяж-Fсопр=0;

Fтяж=Fсопр;

mg=Fсопр=85*9,8=833 Н

Ответ: 833 Н

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