Acar sitting at a red light begins to accelerate at 2.0 m/s2 when the light turns green. it continues with this acceleration until it reaches a speed of 20 m/s. it then travels at this speed for another few minutes. how far does the car travel in the first 46 s after the light changes to green?

Explanation:

here we know that car starts from rest and continue to accelerate till it will reach to maximum speed of 20 m/s

so we will have

so car will accelerate till t = 10 then it will move with uniform speed

so the distance moved by the car till it accelerates is given as

now it will move with uniform speed for next 36 s

so we have

so total distance moved by the car is given as

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

your answer is, orbit around the nucleus