На проводник, перпендикулярный вектору магнитной индукции, со стороны магнитного поля действует сила 20 Н. Активная длина проводника 2 м, сила тока в проводнике 20А. Чему равна индукция магнитного поля (В)?
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.
1. Найти сопротивление R железного стержня диаметром 1 см если масса стержня 1 кг. Плотность железа p = 7874 кг/м³, объём - V=m/p = 1/7874 = =0,00013 м³, сечение - pi*D²/4 = 3.14*0,01²/4 =7,854*10^(-5) м². длина L = V/S = 0,00013 / 7,854*10^(-5) = 1,617 м. Удельное сопротивление железа р = 9,8*10^(-08) Ом*м. Сопротивление R = (p * L) / S = 9,8*10^(-08)*1,617 / 7,854*10^(-5) = = 0,002 Ом. 2. Сечение S = p * L / R, отношение сечений S₁/S₂ = p₁/p₂ = =0,0171 / 0,026 = 0,65769. Отношение масс: m₁/m₂ = 8900* 0,65769 / 2700*1 = 2,17. 4. I = E / (r + R) = 1,1 / (1 + 9) = 0.11 A 0,99 1,1 0,9 90,0%
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:
Плотность железа p = 7874 кг/м³, объём - V=m/p = 1/7874 =
=0,00013 м³, сечение - pi*D²/4 = 3.14*0,01²/4 =7,854*10^(-5) м².
длина L = V/S = 0,00013 / 7,854*10^(-5) = 1,617 м.
Удельное сопротивление железа р = 9,8*10^(-08) Ом*м.
Сопротивление R = (p * L) / S = 9,8*10^(-08)*1,617 / 7,854*10^(-5) =
= 0,002 Ом.
2. Сечение S = p * L / R, отношение сечений S₁/S₂ = p₁/p₂ =
=0,0171 / 0,026 = 0,65769. Отношение масс:
m₁/m₂ = 8900* 0,65769 / 2700*1 = 2,17.
4. I = E / (r + R) = 1,1 / (1 + 9) = 0.11 A
0,99 1,1 0,9 90,0%