The imaginary, huge, apparently moving sphere on which the stars appear to be mounted is called the _______________ sphere
a. celestial
b. global
c. universal
d. galactic
a
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Liquid crystal displays make use of interference of light
Indicate whether the statement is true or false
The diameter of the Milky Way is 100,000 ly. This distance in SI units is
A) 5 x 1015 m. B) 1 x 1021 m. C) 4 x 1030 m. D) 3 x 1036 m. E) 2 x 1042 m.
The frictional force of the floor on a large suitcase is least when the suitcase is
a. pushed by a force parallel to the floor. b. dragged by a force parallel to the floor. c. pulled by a force directed at an angle q above the floor. d. pushed by a force directed at an angle q into the floor. e. turned on its side and pushed by a force parallel to the floor.
The right-hand rule allows one to find a property of the interaction of a magnetic field with a charged particle. The right-hand rule applied to moving charges:
a. results in positive charges moving clockwise. b. results in negative charges moving clockwise. c. can be used for positive charges only. d. gives the direction of the force on a charge moving in a magnetic field.