How many sterilizing impacts have occurred on the Earth since the heavy bombardment?
A) several during the last 500 million years
B) many throughout the Earth's history
C) none
D) one, 65 million years ago
C
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When the position of a simple harmonic oscillator is equal to A/2, where A is the amplitude, the kinetic energy is:
A. (3/4)
B. (1/4)
C. (3/8)
D. (1/8)
E. (1/2)
Which of the following are in order of decreasing temperature?
A) O9, F2, F7, G2, K0 B) K0, G2, F7, F2, O9 C) F7, F2, O9, K0, G2 D) O9, F7, F2, G2, K0
A layer of ethyl alcohol (n = 1.361) is on top of water (n = 1.333). To the nearest degree, at what angle relative to the normal to the interface of the two liquids is light totally reflected?
a. 78° b. 88° c. 68° d. 49° e. the critical angle is undefined
Using dimensional analysis, which one of the following equations is dimensionally correct? ( a ? m/s2, v ? m/s, x ? m , t ? s)
A) x = v/t B) v = 2ax C) t2 = x/a D) x2 = 2av E) x = a t