Explanation:
Trains that use magnetic levitation (maglev) are suspended above the track, which greatly reduces friction from the rails and allows the trains to travel between 250 and 300 miles per hour! Magnetic levitation uses attractive and repulsive magnetic forces to suspend and control the speeds and motion of the trains.
Answer:

Explanation:
Let the mass of copper ball is "m" gram
now the total number of copper atom present in the ball is given as

now the total number of electrons in one copper atom is 29
so total number of electrons in given sample of copper ball is

now diameter of the ball is 7.0 mm
density of the ball = 
now we have



now we have

now the charge on the copper ball is 40 nC
so the number of electrons removed



so the fraction of number of electrons removed is given as



Answer:
See a tractor is more slow but has a greater force and a car is fast but has a slower force
Explanation:
so your answer is Tractors have more force then cars