Neptune and Uranus have a bluish tint because:
A) at their distances, the Sun appears blue, the red absorbed by dust in the ecliptic.
B) they are far away and distance makes objects appear bluish.
C) their atmospheres contain methane, which absorbs red light.
D) their atmospheres contain hydrogen and helium.
E) ammonia ice reflects blue light better than any other color.
C
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Which of the following wavelengths could NOT be present as a harmonic on a 2 m long string?
a. 4 m b. 2 m c. 1 m d. 0.89 m e. 0.5 m
All real engines are less efficient than the Carnot engine because
A. they do not operate through the Otto cycle. B. they do not operate through a reversible cycle. C. the working substance does not maintain a constant volume through the cycle. D. the working substance does not maintain a constant pressure through the cycle. E. the working substance does not maintain a constant temperature through the cycle.
The upward force exerted by a fluid on an object immersed in it is called __________
Fill in the blank(s) with correct word
A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal -100 cm focal length. What is the size of the image formed?
A. 5.0 cm B. 7.2 cm C. 7.5 cm D. 30 cm E. 12 cm