The planets are seen in the Zodiac constellations because:
a) they reach the zenith at noon during the fall equinox
b) they orbit the Earth just like the Sun does
c) they orbit the Sun in the same plane as the Earth does
d) they reach the meridian at noon during the summer solstice
e) they reach the zenith at noon during the summer solstice
Ans: c) they orbit the Sun in the same plane as the Earth does
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At a depth of about 1030 m in the sea, the pressure has increased by 100 atmospheres (to 1.0 × 107 N/m2). By how much has 1.0 m3 of water been compressed by this pressure? The bulk modulus of water is 2.3 × 109 N/m2
A) 2.3 × 10-3 m3 B) 3.3 × 10-3 m3 C) 4.3 × 10-3 m3 D) 5.3 × 10-3 m3 E) 6.3 × 10-3 m3
Cosmological redshift is the result of
A) the high speeds at which galaxies move within clusters. B) the expansion of the universe. C) old, red stars in distant galaxies. D) supermassive black holes.
A confined gas has an average energy/molecule of 60. meV. If the pressure is tripled and the volume is reduced by a factor of 3, what now is the average energy?
A) 0.18 eV B) 0.10 eV C) 0.06 eV D) 0.02 eV E) 0.03 eV
When an unstable Lutetium nucleus undergoes beta decay, the nucleus formed is that of
a. Lutetium. b. Tantalum. c. Ytterbium. d. Thulium. e. Hafnium.