The oldest rocks on our crust are radioactively dated at about:
A) 200 million years old.
B) one billion years old.
C) 2.7 billion years old.
D) four billion years old.
E) 4.6 billion years old.
D
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A golf club hits a golf ball with a force of 2400 N, sending the ball into the air. The force exerted on the club by the ball must be less than 2400 N or else the ball would not have moved forward
A) True B) False C) The answer depends on whether the golfer followed through with the swing.
If you point toward the zenith right now and then point there again 6 hours later, you will have pointed twice in the same direction relative to
a. your horizon. b. the Sun. c. the Moon. d. the fixed stars.
Simple Harmonic Motion: If the amplitude of the motion of a simple harmonic oscillator is doubled, by what factor does the maximum speed of the oscillator change?
A. 2 B. 4 C. It does not change. D. 1/2 E. 1/4
Circular Motion of Charges: A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field lines. Ignoring the particle's weight, the particle will
A. move in a straight line. B. follow a spiral path. C. move along a parabolic path. D. follow a circular path.