How is it possible for a convex lens to form a real image?
a)exiting light rays refract toward the normal and intersect at the focal point
b) light rays refract and travel parallel to the principal axis
c) exiting light rays travel backward and bend toward the normal
d) light rays travel though the focal point on the way to the lens

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.

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?