Nuclear Reactions: The equation shows a fission reaction:
U + 
n ? 
Nb + X + 4 
nWhat is the missing term X in the equation?
A. 
Ag
B. 
Sb
C. 
Sb
D. 
Ag
E. 
Sb
Answer: E
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In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about the Earth. b. the center of the universe was the Sun with the Milky Way representing other distant planets. c. the Sun was at the center of the universe. d. the Earth was at the center of the universe. e. None of the above was believed.
What was the Shoemaker-Levy 9 impact?
A) the 1994 impact of a chain of comet fragments into Jupiter B) the impact thought to have wiped out the dinosaurs C) the impact that created the Moon's largest crater D) the ninth impact witnessed by astronomers in modern times
If the speed of a continuous wave is constant, as you increase the frequency of the wave, the wave must have a proportionally _________ wavelength
Fill in the blank(s) with correct word
A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
a. +0.29 kJ b. ?0.29 kJ c. +30 J d. ?30 J e. ?50 J