People of central Africa predicted the weather by
A) recording the seasonal changes in average temperature.
B) observing the location of the Moon relative to the Sun in the sky.
C) observing the path of the planets across the sky.
D) observing the orientation of the crescent moon relative to the horizon.
E) observing the length of the lunar cycle.
D
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Which of the following best describes the mobile-first strategy?
A. Creating a separate mobile website version. B. Mobile-first is synonymous with RWD. C. Designing for mobile users, rather than desktop or laptop users. D. Creating a low-bandwidth or nongraphical website.
Imagine the much more massive Jupiter were to switch places with the less massive Mercury. Which of the following would accurately describe the outcome?
A. Jupiter would orbit the Sun in less time than it did before. B. Mercury would orbit the Sun in less time than it did before. C. The orbital time for each of the planets would not change. D. Jupiter would orbit the sun in more time than it did before.
The ancient Greeks, including Ptolemy, thought that the stars were
A) scattered everywhere between the moon and the inside surface of a large sphere that enclosed the universe. B) scattered throughout infinite space. C) alive. D) scattered everywhere between Earth and the moon. E) fixed to the inside surface of a large sphere that enclosed the universe.
A ray of light is incident on the mid-point of a glass prism surface at an angle of 24.0° with the normal. For the glass, n = 1.55, and the prism apex angle is 44.3°. What is the angle of refraction as the ray enters the air on the far side of the prism?
a. 0.853° b. 48.9° c. 18.3° d. 11.7° e. 29.1°