Вопрос школьника по предмету Физика
Двигатель кондиционера работает от сети с напряжением 220 В. Сила тока в двигателе равна 5 А. Какую полезную работу выполняет двигатель за 10 мин , если его КПД составляет 90%?
Ответ учителя по предмету Физика
U=220 B
КПД 90%
I= 5 A
N-?
N=5/0.9*220=990 Bt
ответ = 990 Вт
Похожие вопросы от пользователей
1. When did the War of Independence begin?
2. On what country did the colonies in Americav declare a war?
3. What country won the Revolutionary War? When was it?
4. What problem did the young country face after the war?
5. Where was the US Constitution written? Who wrote it?
6. Why can the US government be compared with a tree?
7. What is the US Congress? How is it divided?
8. How many people does each state send to the Senate? Does the number of senators depend on the size of the state?
9. Do all states send people to the House of Representatives? What does the number of people depend on there?
10. Who carries out the laws that the Congress makes?
11. Who helps the President to make decisions?
12. When do Americans vote for the President?
13. What do you call the third branch of the US government?
14. How many judges does the Supreme Court consist of?
15. How long do the judges work in the Supreme Court?
16. The US Constitution can be changed, can’t it?
17. What do you call changes to the Constitution?
18. How many amendments to the Constitution can you name?