Cho mạch điện có hai điện trở R1= 30 Ω; R2 = 18Ω mắc nối tiếp với nhau, Mắc vào hiệu điện thế của nguồn UAB = 12V a. Vẽ sơ đồ mạch điện .Tính điện trở tương đương của mạch ?
b. Tính hiệu điện thế hai đầu mỗi điện trở ?

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied

The coulomb's law explains which of the following? select all the force between two charged objects is inversely proportional to the charge on each object. the force between two charged objects is directly proportional to the charge on each object. the force between two charged objects is directly proportional to the distance separating them. the force between two charged objects is inversely proportional to the square of the distance separat coulomb's law is similar to newton's 2nd law. if the force between two objects is f and the charge on both objects is doubled, the new force between the would now be 2f. if the force between two objects is 2f and the distance separating them is doubled, the new force between the objects would now o the be zf.

Lightning is an example of what phenomenon? a release of a large amount of energy an absorption of a large amount of energy a natural electric circuit a natural electric current