The temperature coefficient of resistivity for copper is 0.0068°C-1. If a copper wire has a resistance of 104 ? at 20°C, what is its resistance 80°C?
A)
192 ?
B)
42 ?
C)
71?
D)
161 ?
E)
146 ?
E
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Quantum mechanics tells us that the probability of finding the electron in hydrogen at a distance between r and r + ?r in the ground state is greatest at a distance _____ a0 , where a0 is the Bohr radius.
A. 0.707 B. 1.00 C. 1.41 D. 2.00 E. 3.001/2
How does the macroscopic motion of a paper airplane affect the motion of the atoms that make up the piece of paper?
a. It has no significant effect. b. The random movement of the atoms that make up the paper is replaced by orderly movement in the direction the airplane is moving. c. The atoms all move in opposition to the direction the airplane is flying. d. The atoms continue to move randomly but in addition each has an added velocity contribution in the direction the airplane is flying. e. The motion in the opposite direction of the airplane no longer occurs.
The general heliocentric model proposed by Copernicus was appealing, and eventually became preferred, because
A. it explained why we do not observe stellar parallax. B. it was more aesthetically pleasing than the complicated Ptolemaic model. C. it made more accurate predictions than the Ptolemaic model. D. it replaced Earth with the Sun as the center of the solar system.
Poor clusters of galaxies often contain an excess of E and SO galaxies
Indicate whether the statement is true or false