In an experiment, you are studying the relationship between the force on a toy car and the change in motion, or acceleration, of the car. You place 50 N force on the car. Then using the same car you apply 100 N of force. You repeat this several times, increasing and decreasing the force on the car while keeping the mass of the car the same. whats the independent variable?

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?