A car of mass 120kg moving at a velocity 200km/h collide with car B of mass 100kg moving at a velocity of 220kg/h with both cars on a friction less surface. After collision, both car joined together and move at a common velocity, V. (i)calculate the total momentum of the two cars before collision
(ii)calculate the velocity of the joint cars cars after impact

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

The energy equivalent of the rest mass of an electron is

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.