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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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.
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.
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
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.