Предмет: Физика, автор: mhjnsisynra88886

Пожалуйста помогите.
Заранее спасибо большое

Приложения:

Ответы

Автор ответа: Clever46
1

Ответ:

1. 150 кг

2. 1600 H

3. 0,01 Дж

Объяснение:

1.Дано: h=2

A=3кДж=3000Дж

m-?

Решение:

A=Fh=mgh

m=A/gh=3000/(10*2)=150кг

2.Дано: P=4кВт=4000Вт

v=9км/ч=2,5м/с

F-?

Решение:

P=A/t=Fv

F=P/v=4000/2,5=1600H

3.Дано: m=500г=0,5кг

v=20см/с=0,2м/с

Eк-?

Решение:

Eк=mv²/2=0,5*0,2²/2=0,01 Дж

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