Magnetic fields affect
A. only electric charges at rest.
B. only electric charges in motion.
C. neither electric charges in motion nor electric charges at rest.
D. both electric charges in motion and electric charges at rest.
Answer: B
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Time Dilation: A spaceship traveling at constant velocity passes by Earth and later passes by Mars. In which frame of reference is the amount of time separating these two events the proper time?
A. the Earth frame of reference B. the Mars frame of reference C. the spaceship frame of reference D. any inertial frame of reference E. any frame of reference, inertial or not
At double the distance from a long current-carrying wire, the strength of the magnetic field produced by that wire decreases to
A) 1/8 of its original value. B) 1/4 of its original value. C) 1/2 of its original value. D) 1/ of its original value. E) /3 of its original value.
Which of the following types of chemical bond is not a primary bond type?
(a) Covalent (b) Fluctuating- electric dipole (c) Metallic (d) Ionic
A 120 kg mass is blown apart into an 80 kg piece and a 40 kg piece. After the blast, the two masses are moving apart with a relative velocity of 60 m/s. The total kinetic energy after the explosion is
A. 21 kJ. B. 35 kJ. C. 48 kJ. D. 56 kJ. E. 82 kJ.