Предмет: Физика, автор: BeZZumnaya

Ребят очень срочно!!! Даю 100 баллов за достойное решение 2 задач по физике 8 класс. Последовательное и параллельное соединение. Плиз!!!!!

Приложения:

1235tust: В №5 Уточните условие. Rob=?
1235tust: И я дорешаю
BeZZumnaya: R общ. = 40 Ом
BeZZumnaya: ой
BeZZumnaya: в №5 R общ. = 5,3 Ом

Ответы

Автор ответа: 1235tust
1

Ответ:

Объяснение:

№2

R1=U1/I=69/3=23 Ома

U2=U12-U1=99-69=30 B

R2= U2/I=30/3=10 Ом

R3= Rob - (R1+R2) = 40 - (23+10)=7 Ом

U3=I*R3=3*7 = 21 B

U=U12+U3=99+21=120 B

№5

Uob=U1=U2=8B

R2=U/I2=8/2=4 Ома

Rob=R1*R2/(R1+R2)

3.5=R1*4 / (R1+4)

R1*3.5 +14 =R1*4

R1*(4-3.5)=14

R1=28 Ом

I1=U/R1=8/28=0.2857 A

Iob=I1+I2=0.2857+2=2.2857 A


BeZZumnaya: дорешайте плиз!!! не понимаю физику, очень прошу
1235tust: За что 4 балла? Все решил. Общее сопротивление в №5 - 3,5 Ом. Так как при параллельном соединении сопротивление общее ВСЕГДА меньше самого наименьшего сопротивления.
1235tust: 5,3 не может быть.
1235tust: Вопросов по решению нет?
BeZZumnaya: спасибо огромное,вопросов нет!
BeZZumnaya: оценку исправила
BeZZumnaya: отмечу как лучший ответ)
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A One year later, in 1905, Thomas Spencer died.

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Don't ask the price, it’s a penny!’ 0 D But when Michael Marks became partners with Tom Spencer, the company really found success.

Marks arrived in the UK in 1882 and moved to the northern city of Leeds. 1____. He started working for a company which employed foreign people who came to live in the UK. He borrowed £5 from a friend (who also taught him some English). 2____. Tom Spencer, who was a shop assistant, worked for the same friend. 3____.

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Throughout the 20th century, Marks and Spencer opened shops all over the UK. 6____. Shops in France followed this in1975. 7____. So from small beginnings, large things can grow!

*market stall = a small shop in a market