Identify whether the following statements describe a change in acceleration.
a. a car stopped at a stop sign
b. a boat traveling east at 10 miles per hour
c. an airplane traveling north 600 miles per hour
d. a person running at 5 meters/second along a curving path

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?