As a white dwarf ages, its position on a standard H-R diagram will move ____
a. upward and to the right
b. upward and to the left
c. downward and to the right
d. straight downward
e. downward and to the left
c
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A straight wire (length = 8.0 m) is bent to form a square. If the wire carries a current of 20 A, what is the magnitude of the magnetic field at the center of the square?
a. 17 ?T b. 14 ?T c. 11 ?T d. 20 ?T e. 36 ?T
If the length of a wire increases, its resistance
a. increases. b. decreases. c. does not change. d. will increase or decrease depending on the composition. e. will change in a way that can not be determined.
Which phase of the Moon sets at noon?
A. waxing crescent B. full Moon C. third quarter D. new Moon E. None, the Moon always sets at sunrise.
A star has a parallax of 0.04 arc seconds. What is its distance?
A. 25 light-years B. 4 parsecs C. 4 light-years D. 25 parsecs