A cube of water ice (r = 0.917 × 10^3 kg/m3) is placed in mercury (r = 13.6 × 10^3 kg/m3), which is liquid at 0° Celsius. If we ignore any possible melting of the ice cube and problems with the surface tension of mercury, the fraction of the ice cube that floats above the surface of the mercury is
a. 0.067 4.
b. 0.073 5.
c. 0.926.
d. 0.933.
e. 1.00.
D
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A) reflection. B) refraction. C) scattering. D) dispersion. E) aberrations.
Nebula that tend to be reddish in color are the
A) emission nebula. B) reflection nebula. C) dark nebula. D) magenta nebula.
The convection zone constantly cycles fresh hydrogen into the Sun's core and moves created helium into the outer parts of the star.
Answer the following statement true (T) or false (F)
Center of Mass: In the figure, four point masses are placed as shown. Assume that all the numbers in the figure are accurate to two significant figures. What are the x and y coordinates of the center of mass (or center of gravity) of this arrangement?
A. (2.2 m, 2.6 m) B. (2.2 m, 2.7 m) C. (2.3 m, 2.6 m) D. (2.3 m, 2.7 m) E. (2.3 m, 2.8 m)