How do we think the first generation of stars would have been different from stars born today?
A) They would have lacked elements heavier than hydrogen and helium.
B) They would have generated energy through fission rather than fusion.
C) They would have all been very low in mass.
D) They would have shined only with ultraviolet light, not visible light.
A) They would have lacked elements heavier than hydrogen and helium.
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A positive object touches a neutral electroscope, and the leaves separate. Then a negative object is brought near the electroscope, but does not touch it. What happens to the leaves?
A) They separate further. B) They move closer together. C) They are unaffected. D) cannot be determined without further information
A hollow steel ball of diameter 3.0 m just barely floats in water. What is the wall thickness of the ball? (?Fe = 7.87 g/cm3, ?water = 1.00 g/cm3)
A) 6.6 cm B) 37 cm C) 131 cm D) 79 cm
Astronomers have found the center of the Universe to be located in
a. Earth b. the Sun c. Sagittarius A d. the Virgo Cluster of galaxies e. no center is thought to exist.
What is the volume of the 238 92U nucleus?
a. 
b. 
c. 
d. 
e. 