The terrestrial planets, ranked in order of decreasing atmospheric density, are

a. Venus, Earth, Mars, Mercury
b. Venus, Mars, Earth, Mercury
c. Mercury, Mars, Earth, Venus
d. Mars, Venus, Mercury, Earth


a. Venus, Earth, Mars, Mercury

Physics & Space Science

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A particle is moving at 0.75c relative to a lab on Earth. By what percentage is the Newtonian expression for its momentum in error? (The percentage error is the difference between the erroneous and correct values, divided by the correct one)

A) 34% B) 28% C) 38% D) 43%

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The term detergent means "cleansing agent" and commonly refers to a(n) ______________ substitute

Fill in the blank(s) with correct word

Physics & Space Science

_____ is a series of three nuclear reactions that builds a helium nucleus by adding protons one at a time

A) The proton-neutron chain B) The helium proton chain C) The proton-proton chain D) The hydrogen-helium chain

Physics & Space Science

Why don't low-mass stars have the CNO cycle occurring in their cores?

A) They don't have enough carbon, nitrogen, and oxygen. B) The CNO cycle makes elements heavier than carbon, nitrogen, and oxygen. C) Their core temperatures are too low.

Physics & Space Science