Spring tides occur
a. at new moon and first quarter moon.
b. at first quarter and third quarter moons.
c. at new moon and full moon.
d. at third quarter and full moons.
e. at noon and midnight.
C
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If it were not for the greenhouse effect on Earth,
a. there would be no liquid water on Earth. b. life as we know it would not have developed on Earth. c. it would be a much colder planet. d. there would be no oxygen in Earth's atmosphere. e. All of the above are results of the greenhouse effect.
At extremely high temperatures (e.g., millions of degrees), which of the following best describes the phase of matter?
A) a gas of rapidly moving molecules B) a plasma consisting of positively charged ions and free electrons C) a gas consisting of individual, neutral atoms, but no molecules D) a plasma consisting of rapidly moving, neutral atoms E) none of the above (At these extremely high temperatures, matter cannot exist.)
Two objects with indices of refraction n1 and n2 are placed in the same liquid substance and have their critical angles measured. If experiment shows that ?c1 > ?c2, then it must also be true that
1. n1 < n2. 2. n1 > n2. 3. n1 = n2. 4.more must be known to determine the relationship between n1 and n2.
An infinite plane of charge with
is tilted at a 45° angle to the vertical direction as shown below. The potential difference, VA ? VB, in volts, between points A and B, a 4.50 m distance apart, is
?
?
a.
?7.06.
b.
?9.98.
c.
?14.11.
d.
+7.06.
e.
+9.98.