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

Physics & Space Science

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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.

Physics & Space Science

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.

Physics & Space Science

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

Physics & Space Science

The part of the electromagnetic spectrum most absorbed by water is

A) infrared. B) red. C) cyan. D) all about equally.

Physics & Space Science