Colors seen when gasoline forms a thin film on water illustrate
A) refraction.
B) reflection.
C) dispersion.
D) polarization.
E) interference.
Answer: E
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A boulder following a straight-line path at constant velocity has
A) a net force acting upon it in the direction of motion. B) zero acceleration. C) no forces acting on it. D) none of the above
The size of a black hole, its Schwarzschild radius, is simply proportional to its _____
A) mass B) luminosity C) temperature D) density
From the center outward, the correct order is
A) liquid iron inner core, solid nickel outer core, rocky mantle, silicate crust. B) solid metallic inner core, molten metal outer core, silicate mantle and crust. C) solid metal core, molten metal hydrosphere, rocky lithosphere, gases in atmosphere. D) solid rock core, liquid metal mantle, solid rock crust. E) molten metal hydrosphere, molten rock lithosphere, solid silicate crust.
The amount of dark matter in the universe is
A) about the same as the amount of visible matter. B) many times more than the amount of visible matter. C) about twice as much as the amount of visible matter. D) many times less than the amount of visible matter. E) entirely unknown at the present time.