In a "railgun", or electromagnetic cannon, the projectile is accelerated by a magnetic field. What should be the length of the acceleration section of the "railgun" for the projectile to accelerate to a speed of v = 8 km / s in t = 0.01 s? Considering the force of the magnetic impact on the projectile to be constant, determine how many times it exceeds the mass of the projectile on the Earth's surface.

Detailed solution with a short recording of the conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.