Parallax is
a. the apparent motion of an object due to the motion of the observer.
b. the distance between two foci of an ellipse.
c. the small circle that the planets slid along in Ptolemy's geocentric universe.
d. the circular orbits used in Copernicus' heliocentric universe.
e. half the length of the shortest diameter of an ellipse.
A
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Entropy: What is the change in entropy of the lead when 2.0 kg of molten lead at its melting point temperature solidifies? For lead: LV = 207 kcal/kg at 1744°C, LF = 5.9 kcal/kg at 328°C.
Fill in the blank(s) with the appropriate word(s).
A tube of mercury with resistivity 9.84 × 10-7 ? ? m has a uniform electric field of 23 N/C inside the mercury. How much current is flowing in the tube, if the radius of the tube is 0.495 mm?
A) 18 A B) 29 A C) 180 A D) 280 A
If the scalar (dot) product of two vectors is negative, it means that
a. there was a calculator error. b. the angle between the vectors is less than 90 degrees. c. the angle between the vectors is 90 degrees. d. the angle between the vectors is greater than 270 degrees. e. the angle between the vectors is between 90 and 180 degrees.
The air temperature where the humidity reaches the saturation density is called the ___________
Fill in the blank(s) with correct word