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
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The current definition of the standard second of time is based on
A) the frequency of radiation emitted by cesium atoms. B) the earth's rotation rate. C) the duration of one year. D) the oscillation of a particular pendulum kept in France.
Without the strong nuclear force, the universe would be made only of hydrogen
Indicate whether the statement is true or false
What holds the nucleus together?
a. electrical forces between the protons b. alpha particles c. beta particles d. strong forces
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