Which of these experiments would make use of qualitative data? a. a study of different shapes to compare rolling friction b. a study on the effects on sunlight on growth rate of plants c. a study of different surfaces to compare ability to repel water d. a study of change in a freezing point of water when salt is added

Why is there friction between objects

Which atomic model was proposed as a result of j. j. thomson’s work?

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?