Four things that the resistance of a conducting material depends on are __________, __________, __________ and ___________
Fill in the blank(s) with correct word
composition, length, diameter, temperature
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The gravitational force between two objects can be described using the equation Fg = G M1 M2 / d2. In this equation, what does d represent?
A) the universal gravitational constant B) the density of the smaller object C) the distance between the two objects D) the diameter of the larger object
A circular coil of copper wire is lying flat on a horizontal table. A bar magnet is held with its south pole downward, vertically above the center of the coil. The magnet is kept stationary with respect to the coil
As viewed from above, you can say that the magnet induces A) counterclockwise current in the loop. B) clockwise current in the loop. C) no current in the loop. D) an emf but no electric current in the loop. E) Not enough information is provided.
Adding a secondary concave lens of carefully chosen different glass to the primary lens on a refractor allows
A) chromatic aberration to be reduced. B) more light to be gathered. C) greater magnification. D) X-rays to be focused. E) effects of atmospheric turbulence to be reduced.
The first planets around other Sun-like stars were discovered
A) by Huygens, following his realization that other stars are Suns. B) by Galileo following the invention of the telescope. C) at the turn of last century. D) about a decade ago. E) at the turn of this century.