The density of a nucleus (to a reasonable approximation) is independent of the mass number
Indicate whether the statement is true or false
TRUE
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The reason why ancient astronomers thought that Earth could not be moving was because stars lacked any measurable parallax beyond one degree
a. True b. False Indicate whether the statement is true or false
Winter and summer differ in length on Mars because of its elliptical orbit
Indicate whether the statement is true or false
Four point charges of magnitude 6.00 ?C and are at the corners of a square 2.00 m on each side. Two of the charges are positive, and two are negative
What is the electric potential at the center of this square, relative to infinity, due to these charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 ) A) 153 kV B) 61.0 kV C) 76.4 kV D) 306 kV E) 0 V
In a mass-energy census of the universe, what are the approximate proportions of normal matter, dark matter, and dark energy?
A) 68% dark matter, 27% dark energy, 5% normal matter B) mostly normal matter, with only trace amounts of dark matter and dark energy C) 27% dark matter, 68% dark energy, 5% normal matter D) 33% dark matter, 33% dark energy, 33% normal matter