We say that Earth has an axis tilt of 23-1/2° because this is the angle between Earth's
A) rotation axis and a line perpendicular (vertical) to the ecliptic plane.
B) rotation axis and the star Polaris.
C) equator and rotation axis.
D) rotation axis and north pole.
E) rotation axis and magnetic axis.
A) rotation axis and a line perpendicular (vertical) to the ecliptic plane.
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The frequency in an AC series circuit is quadrupled. By what factor does this change the capacitive reactance?
a. 1/4 b. 1/16 c. 4 d. 16 e. 1
Which of the following is not a thermoplastic polymer?
(a) Polyethylene (b) Epoxy (c) Polyvinylchloride (d) Polypropylene
Deuterium and helium could be made only during the nuclear epoch
Indicate whether the statement is true or false
The suffix -ol in a compound's name signifies
a. an enzyme. b. an amide. c. an alcohol. d. a carbohydrate.