Вопрос школьника по предмету Физика
1. В каких из нижеперечисленных случаев совершается механическая работа мальчик влезает: на дерево девочка играет на пианино вода давит на стенку сосуда вода падает с плотины.
2. При помощи подъемного крана подняли груз массой 2500 кг на высоту 12 м. Какая при этом совершается работа.
Ответ учителя по предмету Физика
1. Вода в сосуде не совершает работу.
2. E= mgh;
E=2500*10*12=300000 Дж=30 кДж.
Работа равна изменению энергии, то есть A=E.
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