In the Hertzprung—Russell diagram most stars are found

A) on the main sequence
B) in the red giant region
C) in the white dwarf region
D) in the supergiant region


A

Physics & Space Science

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Approximately how much air is in a column 1-cm2 in cross section that extends from sea level to the top of the atmosphere?

A) 1 gram B) 1 kg C) 10 kg D) 100 kg

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A bicyclist starts from rest at the top of a hill and rolls down the hill without pedaling. Assuming there is no friction and the bottom of the hill is 20 meters below the top, what is the bicyclist's speed at the bottom of the hill?

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If you represented each star by a grain of sand, about how much sand would it take to represent all the stars in the observable universe?

A) all the sand in a typical playground sandlot B) all the sand on Miami Beach C) all the sand on the beaches of California D) one cubic meter of sand E) all the sand on all the beaches on Earth

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Compared to a hydrogen atom where the proton and electron both have spin in the same direction, an atom where they spin in opposite directions will have ________ energy

Fill in the blank(s) with correct word

Physics & Space Science