Which of the following is a limit of science? 1.The technology or tools available to test scientific claims
2. The number of times an experiment can be repeated
3.The total number of scientists in a field, like physics or chemistry
4. The use of critical thinking and evidence to study phenomena

Will you chech and finish these for me, because i am stumped with them.

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?

What is friction? how does it affect the motion of an object?