The Cambrian Explosion began approximately
A) 2.1 billion years ago
B) 542 million years ago
C) 1.2 billion years ago
D) 65 million years ago
B
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What is the frequency, in hertz, of a sound wave (v = 340 m/s) with a wavelength of 68 m?
a. 5 Hz b. 23120 Hz c. 340 Hz d. 0.2 Hz
When at rest, a spacecraft has the same height as length. When moving at relativistic speeds in the direction of its length, which one of the following describes its length and height to an observer at rest?
a. Its length is decreased and its height is increased. b. Its length is decreased and its height is decreased. c. Its length is decreased and its height is unchanged. d. Its length is unchanged and its height is increased. e. Its length is increased and its height is decreased.
Sixty miles/hour is about how many meters/second?
A) 96 B) 112 C) 1.6 D) 27 E) 37
Examine flow control from your own perspective. Is it justified, or should the free market reign? Explain your reasons clearly
What will be an ideal response?