Which of the following is true of Mars's atmosphere?
A) It is mostly composed of carbon dioxide.
B) It is mostly composed of nitrogen.
C) It is as inhospitable as the Moon's atmosphere.
D) It is as dense as Venus's atmosphere.
A
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An “empty” steel barrel with its lid off has some gasoline remaining in the bottom, as shown. If the vapor pressure is 1 psia, estimate the evaporation rate of the gasoline and its vapor pressure half-way up in the barrel. Assume the mass diffusivity of gasoline into air is 0.0094 ft^2/s and assume that the vapor pressure of the gasoline is zero at the top.
Imagine that sound waves with a certain definite wavelength flow through a partially open sliding door. If the door is closed somewhat further (but not shut entirely), the angle through which the sound waves are diffracted
A. Decreases. B. Increases. C. Remains the same. D. Depends on quantities not specified (explain).
Describe how a simple electric cell works
What will be an ideal response?
Using the ideas discussed in your textbook, in what sense are we "star stuff"?
A) Movie stars and other people are all made of the same stuff, so we all have the potential to be famous. B) The overall chemical composition of our bodies is about the same as that of stars. C) We could not survive without light from our star, the Sun. D) Nearly every atom from which we are made was once inside of a star.