The charge of some quarks or anti-quarks is:
a. 0.
c. 1 (1.6 × 10^-19) C.
b. 1/2 (1.6 × 10^-19) C.
d. 1/3 (1.6 × 10^-19) C.
D
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About how many potentially hazardous asteroids pass within 0.05 AU of the Earth per decade in modern times?
A) None B) 10-20 C) 200-300 D) 5000-1000 E) A completely unknown quantity; it could easily be anywhere from just a few to millions.
The ______________ surrounds the nucleus of a comet
Fill in the blank(s) with correct word
A layer of kerosene (n = 1.45) is floating on water (n = 1.33). For what angles of incidence at the kerosene-water interface will light be totally internally reflected within the kerosene?
The best way to increase the calculated fatigue-crack propagation cycles to failure of a part is
(a) To select a material with a high KIc (b) To ensure that the part has a very small initial crack length with nondestructive testing equipment. (c) To polish the surface of the part (d) To case-harden the part