Samochód o masie 1400kg jedzie po linii prostej ze stałą prędkością. Siły oporów ruchu samochodu wy-noszą łącznie 400N. Siła wypadkowa działająca na samochód ma wartość: A.14400N B.13600N C.1000N D.0N Physics

0N

Explanation:

Is the car is moving in a constant direction with constant speed, the composite force is null. We know what because any object that nonzero composite force is applied to will accelerate in the direction of the force, and this one doesn't.

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.