A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held with its south pole downward, vertically above the center of the coil. The magnet is released from rest and falls toward the coil
As viewed from above, you can say that, as it falls, the magnet induces A)
counterclockwise current in the loop.
B)
clockwise current in the loop.
C)
no current in the loop.
D)
an emf but no electric current in the loop.
E)
Not enough information is provided.
B
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Which major atmospheric component is chiefly a product of life processes?
A) Carbon dioxide B) Water C) Oxygen D) Hydrogen sulfide E) Nitrogen
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. The edges of the two mirrors meet at a 30° angle. A light ray that approaches mirror 1 is parallel to mirror 2 . The angle of reflection of that ray from mirror 1 is a. 0°
b. 30°. c. 60°. d. 90°. e. 120°.
Which of the following is not a major influence on atmospheric circulation?
A) the Coriolis force B) the unequal solar heating of Earth C) the distribution of continents and oceans D) the major topographic features on the continents E) the local variations in gravitational acceleration
When water of mass m and specific heat c is heated at constant pressure from absolute temperature T1 to absolute temperature T2, its change in entropy is what?
a. cm ln(T2/T1) b. cm (T2/T1) c. cm (T2 ? T1)/T1 d. cm (T2 ? T1)/T2 e. cm (T2 ? T1)/(T2 + T1)