An aquarium contains a 5-cm layer of water (n = 1.333) floating on top of carbon tetrachloride (n = 1.461). If the angle of incidence into the water from the carbon tetrachloride is 20°, what is the angle of refraction into the air?
a. 20°
b. 30°
c. 38°
d. 69°
e. 26°
b
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Using your results from Problem 4.8, find the heat flow at the base of the fin for the following conditions:
Use a grid spacing of 0.5 cm.
GIVEN
A fin with variable cross-sectional area and perimeter
FIND
(a) Heat flow rate for conditions given above
If Galaxy A is found to have a recessional velocity four times greater than Galaxy B, what can you say about their relative distances from Earth?
a. Galaxy A is four times closer than Galaxy B. b. Galaxy A is four times further away than Galaxy B. c. Galaxy A is twice as distant than Galaxy B. d. Galaxy A is twice as close than Galaxy B.
The part of the electromagnetic spectrum most absorbed by water is
A) infrared. B) red. C) cyan. D) all about equally.
Two nuclei which share the same mass number A always are (Hint: Eliminate any wrong answers.)
a. stable. b. unstable. c. isotopes. d. isobars. e. radioactive.