Заряженные шарики, находящиеся на расстоянии 2 м друг от друга, отталкиваются с силой 1 Н. Общий заряд шариков равен 50 мкКл. Чему равен заряд каждого шарика? ответ выразить в мкКл, округлить до целых, записать через запятую без пробелов и единиц измерения, в порядке возрастания
12,25 А (при g = 9,8 Н/кг)
или 12,5 А (при g = 10 Н/кг)
Объяснение:
Полезная работа: Ап = mgh
Затраченная работа или энергия, потреблённая электродвигателем:
Аз = Ап / КПД = mgh / КПД
Эта работа (Аз) была совершена электродвигателем. Её можно посчитать по формуле:
Аз = UIt, где U - напряжение, I - сила тока, t - время
Получаем:
U × I × t = m × g × h / КПД
Выразим силу тока:
I = m × g × h / (КПД × U × t)
I = 1000 кг × 9,8 Н/кг × 19 м / (0,8 × 380 В × 50 с) = 12,25 А
(если g принять за 10 Н/кг, то получим 12,5 А)
Nowadays people have started to realize that good health is very important, much more important than wealth. To be in good health people must follow a healthy life style, to do things that will help keep a healthy body and mind, to feel fit.There are several ways to do it. The state of your body depends on how much time you spend doing sports. At least everybody must do morning exercises every day. The healthiest kinds of sports are swimming, running and cycling. Healthy food is also a very important factor. The daily menu should include meat, fruit and vegetables, milk product, which are rich in vitamins, fat, proteins and etc. On the other hand modern diets are very popular especially among women. Diets may be harmful, if they are used in the wrong way. To be healthy, people should get rid of their bad habits. It’s necessary to stop smoking and drinking much. Everyone should remember that cigarettes, alcohol and drugs destroy both body and brain. In addition it is recommended to watch TV less, avoid anxiety and observe daily routine. )
1)Good health is very significant.
2)All diets are useful and healthy.
3)It is recommended to do yoga to be in good health.
4)Alcohol and cigarettes influence only on body.
5)It is important to get rid of bad habits in order to keep a healthy body and mind.
Объяснение: