Question 1 (2 points] The speed of molecules in air at room temperature is: exac

Question

Question 1 (2 points] The speed of molecules in air at room temperature is: exactly 330 m/s for all molecules. roughly between 0 and 1000 meters per second. always greater than 30,000 meters per second. 30 cm per second. Question 2 [2 points] In the atmosphere, hydrostatic equilibrium refers to: U the fact that sea surface pressures are always the same everywhere on earth. the fact that surface pressures will vary over time. U the equilibrium between human groundwater use and natural recharge I the balance between air pressure at a given altitude and the weight of the molecules above that altitude. Question 3 [2 points] What is the difference between geopotential height and altitude above sea level? I There is no difference, they are both synonymous. U Geopotential corrects for a decrease of gravitational accelleration with altitude. Geopotential is the electric charge of the Earth (due to the solar wind.) Geopotential is used below sea level, whereas altitude is used only above sea level. p= pRaT p= RT [2 points] Given equation 1, which of the following statements is NOT true for a Question 4 volume of air? U With pressure being constant, a decrease in temperature will cause a decrease in density. With density being constant, an increase in temperature will lead to an increase in pressure. U Ra is the molecule-specific gas constant for dry air. | With temperature being constant, a decrease in pressure will cause a decrease in density.

Explanation / Answer

1. The speed of molecules in air at room tremperature is roughly between 0 and 1000 m/s.

generally the average speed of air molecules at room temperature is about 500m/s

2. In the atmosphere hydrostatic equilibrium refers to balance between air pressure at the given altitude and weight of molecules above that altitude.

pressure is proportional to the altitude. pressure at any altitude is represented by weight per unit area of the air column above the given altitude.

3.What is the difference between the geopotential height and altitude above sea level ? geopotential corrects for a decrease of gravity acceleration with altitude.

this is the geometric altitude with correction due to the gravity variations.

4. Given equation 1 , which of the following statements are not true for a volume of air ? With pressure being constant, a decrease in temperature will cause a decrease in density.

from the eqn we can see that temperature is inversesly proportional to density.

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