Imagine that it turns out that dark matter (not dark energy) is made up of an unstable form of matter that decays into photons or other forms of energy about 50 billion years from now
Based on current understanding, how would that affect the universe at that time? A) Stars would cease to exist when the dark matter is gone.
B) Planetary systems would expand and disperse.
C) The galaxies in clusters would begin to fly apart.
D) The universe would cease its expansion.
C
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An electron gun sends electrons through a region with an electric field of 
for a distance of 2.5 cm. What is the acceleration of the electrons while in this electric field?
a. 
b. 
c. 
d. 
e. 
During an adiabatic compression of an ideal gas
A) the internal energy of the gas remains constant. B) the temperature of the gas does not change. C) no heat enters or leaves the gas. D) no work is done on the gas. E) none of the above
Which of the following did NOT contribute to the thinning of the Martian atmosphere during its early history?
A) the photodissociation of water molecules by ultraviolet light in the atmosphere B) the stripping of the atmosphere by solar wind particles from the Sun C) the consumption of carbon dioxide by photosynthetic bacteria D) atmospheric gases being blasted into space by large impacts
An atomic nucleus has a charge of +40e. What is the magnitude of the electric field at a distance of 1.0 m from the nucleus?
A) 5.4 × 10-8 N/C B) 5.6 × 10-8 N/C C) 5.8 × 10-8 N/C D) 6.0 × 10-8 N/C E) 6.2 × 10-8 N/C