The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
A. E.
B. F.
C. G.
D. H.
E. A.
Answer: E
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Pressure in a Liquid: An air bubble underwater has the same pressure as that of the surrounding water. As the air bubble rises toward the surface (and its temperature remains constant), the volume of the air bubble
A. increases. B. decreases. C. remains constant. D. increases or decreases, depending on the rate it rises.
A heavy sled and a light sled, both moving horizontally with the same kinetic energy, suddenly slide onto a rough patch of snow and eventually come to a stop
The coefficient of kinetic friction between the sleds and the rough snow is the same for both of them. Which of the following statements about these sleds are correct? (There could be more than one correct choice.) A) Both sleds will slide the same distance on the rough snow before stopping. B) The heavy sled will slide farther on the rough snow than the light sled. C) The light sled will slide farther on the rough snow than the heavy sled. D) On the rough snow, the change in kinetic energy will be the same for both sleds. E) The friction force exerted on the sleds by the snow will do the same amount of work on both sleds.
When you look into a pool of water, the depth looks less than it actually is because of
a. interference b. diffraction c. specular reflection d. refraction e. polarization
Faraday's Law: A circular coil of 20 turns and radius 5.0 cm is placed with its plane oriented at 90° to a uniform magnetic field of 0.10 T. The field is now increased at a steady rate, reaching a value of 0.50 T after 4.0 seconds. What emf is induced in the coil?
A. 0.016 V B. 0.021 V C. 0.026 V D. 0.031 V E. 0.036 V