If the sky were ordinarily yellow-orange instead of blue, then sunsets would appear
1) orange,
2) green,
3) blue,
4) black,
which has to do with
5) the polarization of sunlight.
6) yellow-orange and sky blue being complementary colors.
7) the refraction of sunlight through the thicker atmosphere.
Answer: 3, 6
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A force of 15.2N directed along the positive x-axis combines with a second force to produce a total force vector of magnitude 17.9N. What is the magnitude of the second vector?
A. 2.7N B. 9.5N C. 23.5N D. Not enough information is given.
In 1974, a radio message was sent out from the Arecibo observatory in Puerto Rico towards a globular cluster, 21,000 light-years away. Approximately how far has this message gotten as of today?
A) It's just passing stars that are close neighbors to the Sun in the Milky Way. B) It's just beyond the Neptune in our solar system C) It's just passing through the Oort cloud surrounding our solar system D) It's already arrived at the globular cluster. E) It's almost at the center of the Milky Way.
The Mars Rover found undisputed microfossils, proving life once existed on Mars
Indicate whether the statement is true or false
In an elastic solid there is a direct proportionality between strain and
a. elastic modulus. b. temperature. c. cross-sectional area. d. stress.