The total number of stars in the observable universe is about ________

A) the same as the number of grains of sand on all the beaches on Earth
B) the same as the number of grains of sand in a school sandbox
C) 100 billion
D) the same as the number of atoms that make up the Earth


A

Physics & Space Science

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Without the strong nuclear force, the universe would be made only of hydrogen

Indicate whether the statement is true or false

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What holds the nucleus together?

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A Hooke's law spring is mounted horizontally over a frictionless surface. The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface. What compression of the spring would result in the mass attaining double the kinetic energy received in the above situation?

a. 1.41d c. 2.00d b. 1.73d d. 4.00d

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