A resistor is made out of a long wire having a length L. Each end of the wire is attached to a terminal of a battery providing a constant voltage V0
A current I flows through the wire. If the wire were cut in half, making two wires of length L/2, and both wires were attached to the battery (the end of both wires attached to one terminal, and the other ends attached to the other terminal), what would be the total current flowing through the two wires?
A) 4I
B) 2I
C) I
D) I/2
E) I/4
Answer: A
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Which of the following best describes the meaning of declination and right ascension?
A) They are coordinates on the celestial sphere that are very similar to the coordinates of altitude and direction on Earth. B) They are used to describe the locations and distances of stars that we see in the night sky. C) They are coordinates on the celestial sphere, with declination telling us the angular distance of an object from the celestial equator and right ascension telling us how far around the celestial sphere an object is located from the vernal equinox. D) They are terms used by astronomers to describe how the sky changes with the seasons.
An object is located 2.6 m in front of a plane mirror. The image formed by the mirror appears to be
A) 1.3 m in front of the mirror. B) on the mirror's surface. C) 1.3 m behind the mirror's surface. D) 2.6 m in front of the mirror. E) 2.6 m behind the mirror's surface.
Which of the following best describes the property of the period of orbital revolution for an Earth satellite?
a. greater when the orbital radius is smaller c. independent of the orbital radius b. greater when the orbital radius is larger d. determined mainly by the satellite's mass
A microscope that can view the surface of insulators with atomic resolution is
(a) A scanning electron microscope (b) A scanning tunneling microscope (c) A light optical microscope (d) An atomic force microscope