When we analyze whether a world is a possible home to life, the key thing we look for is ________
A) surface coloration changes that could indicate vegetative growth
B) evidence of atmospheric oxygen
C) the past or present existence of liquid water
D) the presence of organic molecules such as amino acids
C
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Estimate the time required to freeze vegetables in thin, tin cylindrical containers 15 cm in diameter. Air at –12°C is blowing at 4 m/s over the cans, which are stacked to form one long cylinder. The physical properties of the vegetables before and after freezing may be taken as those of water and ice, respectively.
GIVEN
? The freezing of vegetables in thin tin cylindrical cans with air flowing over the cans
? Container diameter (D) = 15 cm = 0.15 m
? Air temperature (T?) = –12°C
? Air velocity (U?) = 4 m/s
? Vegetables have the same properties as water and ice
FIND
? The time (t) to freeze the vegetables
ASSUMPTIONS
? Air temperature is constant
? Thermal resistance of the tin can is negligible
? Thickness of the tin can is negligible
? Thermal capacitance of the frozen vegetable layer is negligible
SKETCH
PROPERTIES AND CONSTANTS
The ice property values given in the problem statement of Problem 9.37 are
For which of the graphs was the result most curved, and closest to the one we are familiar with for the planet orbits about the Sun?
A.) 0%. B.) 25%. C.) 50%. D.) 75%. E.) 100%.
While the orbits of planets are nearly circular, the eccentricities of the orbits of ________ are near one
Fill in the blank(s) with correct word
In a transformer, the power input
A) is larger than the power output. B) is equal to the power output. C) is smaller than the power output. D) can be either larger or smaller than the power output.