Which has the lowest average density?
a) Mercury
b) Venus
c) Uranus
d) Mars
e) the Moon
Ans: c) Uranus
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The total number of stars in the observable universe is about
A) 100 billion. B) the same as the number of grains of sand in a school sandbox. C) the same as the number of grains of sand on all the beaches on Earth. D) the same as the number of atoms that make up the Earth.
It appears that the universe is composed of nearly three times as much dark energy as normal and dark matter combined
Indicate whether the statement is true or false
Sound waves can interfere with one another so that no sound is heard
A) True B) False
A metal block has a density of 5000 kg per cubic meter and a mass of 15,000 kg. What is its volume?
A) 0.33 cubic meters B) 3 cubic meters C) 5 cubic meters D) 15 cubic meters E) none of the above