Which of the following is an example of convection?
a. hot air rising and cooler air falling
b. a hot object transferring heat to a cooler one
c. a hot oven warming the air around it
d. the rays of the sun warming the earth

The softest and hardest minerals are: softest hardest

Which of the following are appropriate acceleration units?

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?