Current: When a current flows through a metal wire, the moving charges are
A. only protons.
B. only electrons.
C. both protons and electrons.
D. positive metal ions.
E. negative metal ions.
Answer: B
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A baseball is thrown vertically upward and feels no air resistance. As it is rising
A) both its momentum and its mechanical energy are conserved. B) its momentum is not conserved, but its mechanical energy is conserved. C) both its momentum and its kinetic energy are conserved. D) its kinetic energy is conserved, but its momentum is not conserved. E) its gravitational potential energy is not conserved, buts its momentum is conserved.
Special relativity predicts that the length of a moving object will be elongated in the direction of motion
Indicate whether the statement is true or false
Two in-phase loudspeakers are some distance apart. They emit sound with a frequency of 1536 Hz. You move between the speakers, along the line joining them, at a constant speed of 2.8 m/s
What beat frequency do you observe? The speed of sound in the room is 330 m/s. A) 13 Hz B) 431 Hz C) 26 Hz D) 4.7 Hz E) 118 Hz
For relaxed viewing (microscope or telescope) the eyepiece is adjusted to place the image at
A) the near point. B) the focal point. C) the pupil of the eye. D) infinity. E) the radius of curvature.