How much mass must be converted to energy to release one million kilowatt hours?
A. 
B. 
C. 4.0 g
D. 
E. 40 pg
B.
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Shown following are five different colors of visible light that travel to Earth from the Sun. Rank these colors of visible light from left to right based on the altitude in the atmosphere where they are completely absorbed, from highest to lowest (Earth’s surface). If two (or more) of the choices reach the surface, rank them as equal by dragging one on top of the other(s).
The celestial sphere is
A) the central spherical region of the Milky Way Galaxy, dense with stars. B) a spherical galaxy, centered on the Sun. C) a useful illusion used to map the stars and other objects in the sky. D) the star-sphere discovered by the Greeks and other ancient civilizations which shows the physical location in space of the nearby stars. E) another name for our spherical Sun.
8.0 grams of water initially at 100°C are poured into a cavity in a very large block of ice initially at 0°C. How many g of ice melt before thermal equilibrium is attained?
A) 10 g B) 900 g C) 500 g D) 100 g E) an unknown amount; it cannot be calculated without first knowing the mass of the block of ice
The speeds of the planets about the Sun depend on
A) their distances from the Sun. B) the masses of the planets. C) both of these D) none of the above