The pre-Copernican astronomers shared a geocentric paradigm that included uniform circular motion, geocentrism, and the perfection of the heavens
Indicate whether the statement is true or false
True
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This figure shows an all-sky map of the cosmic microwave background recorded by the Planck telescope. How long did this light travel through space before it reached the telescope?
A) about 14 billion years B) about 380,000 years C) about a million years D) Depending on what portion of the map we're looking at, the light traveled for times between just a few minutes and a few billion years.
Of all the terrestrial planets, Mercury's orbit is most eccentric and tilted most above the ecliptic
Indicate whether the statement is true or false
Except for such nuclear processes as nuclear reactors, nuclear bombs, and radioactivity, all of the common forces we see around us daily are due to just two underlying or "fundamental" forces. One of these two forces is the electromagnetic force
The other is A) the gravitational force. B) the frictional force. C) contact forces. D) the strong nuclear force. E) the chemical force.
Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.You drop the box. As it falls to its original level, its kinetic energy is 100 J
a. True b. False Indicate whether the statement is true or false