Wave Characteristics: Which one of the following is not an electromagnetic wave?
A. ultraviolet
B. infrared
C. radio waves
D. sound waves
E. gamma rays
Answer: D
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The energy stored in the earth's magnetic field with a strength of 0.5 × 10-4 T in a room 3.0 m by 4.0 m by 2.4 m is
A) 570 mJ. B) 29 mJ C) 10 mJ. D) 100 mJ. E) zero.
A solid uniform disk of diameter 3.20 m and mass 42 kg rolls without slipping to the bottom of a hill, starting from rest. If the angular speed of the disk is 4.27 rad/s at the bottom, how high did it start on the hill?
A) 3.14 m B) 4.28 m C) 3.57 m D) 2.68 m
How do typical wind speeds in Jupiter's atmosphere compare to typical wind speeds on Earth?
A) They are about the same as average winds on Earth. B) They are slightly faster than average winds on Earth. C) They are slightly slower than average winds on Earth. D) They are much faster than hurricane winds on Earth.
A solid nonconducting sphere of radius R carries a charge Q distributed uniformly throughout its volume
At a certain distance r1 (r1 < R) from the center of the sphere, the electric field has magnitude E. If the same charge Q were distributed uniformly throughout a sphere of radius 2R, the magnitude of the electric field at the same distance r1 from the center would be equal to A) E/8. B) E/2. C) 2E. D) 8E. E) E.