The phase of matter in the Sun is
A) gas.
B) plasma.
C) liquid.
D) solid.
E) a mixture of all of the above
B
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In automobiles, brass radiators have been replaced with aluminum ones to reduce weight. Assume that the wall thickness in each radiator is 0.5 mm, the engine fluid is at a temperature of 400 K, and the ambient air temperature is 300 K.
(a) Calculate the heat flux for each radiator material. (b) Estimate the relative area in % and the relative weight of changing from a brass radiator to an aluminum radiator, assuming the same heat transfer rate (dQ/dt) for both designs and that the brass is 30 weight %zinc and 70 weight %copper with a density of 8.4 g/cm3.
As the moon covers the solar disk during a solar eclipse, a flash spectrum of the sun's chromosphere can be recorded. This flash spectrum reveals an emission spectrum and provides information on the properties of the chromosphere. As the moon moves from the inner chromosphere to the outer chromosphere, the spectral lines present in the flash spectrum change. What is going on in the chromosphere
that produces the changes in the flash spectrum? I. The temperature of the chromosphere decreases as the distance from the photosphere increases. II. The temperature of the chromosphere increases as the distance from the photosphere increases. III. The density of the chromosphere decreases as the distance from the photosphere increases. IV. The density of the chromosphere increases as the distance from the photosphere increases. a. I & III b. I & IV c. II & III d. II & IV e. I
A. The component of the curl in this direction is positive. B. The component of the curl in this direction is negative. C. The component of the curl in this direction is zero.
A fundamental force in nature is the
a. strong interaction b. weak interaction c. electromagnetic interaction d. gravitational interaction e. all of the above