Awoman and her dog are out for a morning run to the river, which is located 4.2 km away. the woman runs at 2.2 m/s in a straight line. the dog is unleashed and runs back and forth at 4.0 m/s between his owner and the river, until the woman reaches the river. what is the total distance run by the dog?

distance between woman and river is 4.2 km

speed of the woman = 2.2 m/s

now the time taken by the woman to reach the river is given as

now we have to find the distance covered by the dog in the same time

so the distance covered will be 7.636 km

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 .