Why is Mars red?
A) Chemical reactions between surface rock and atmospheric oxygen literally rusted the surface.
B) Martian volcanoes released a much redder lava than volcanoes on Earth.
C) The red color of Mars is a result of the scattering of light in the Martian sky.
D) The red color is caused by water ice chemically bound in surface rock.
A
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Why is the nucleosynthesis era so important in determining the chemical composition of the universe?
A) We can study the processes that occurred during the nucleosynthesis era to determine how most of the elements in the universe were created. B) By knowing how much matter was created during the nucleosynthesis era, we can determine whether the universe is open or closed. C) We can observe spectra from this era to determine what the primordial mix of the elements was at the beginning of the universe. D) All the elements except hydrogen were produced in the nucleosynthesis era. E) Except for a small amount of elements heavier than helium produced later by stars, the chemical composition of the universe is the same now as at the end of the nucleosynthesis era.
An airplane flies 120 km at a constant altitude in a direction 30.0° north of east. A wind is blowing that results in a net horizontal force on the plane due to the air of 2.40 kN in a direction 10.0° south of west
How much work is done on the plane by the air? A) -2.71 × 108 J B) -0.985 × 108 J C) -221 × 108 J D) 221 × 108 J E) 0.821 × 108 J
The earliest human culture, involving villages and a sense of history, developed
A) about 10,000 years ago. B) about one billion years ago. C) a few million years ago. D) 100,000 to 200,000 years ago. E) about 1000 years ago.