ATMOSPHERIC THERMODYNAMICS - Elementary Physics and by Christopher J. Foot

By Christopher J. Foot

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What is the velocity of the mass when it strikes the Earth’s surface? (This is exactly the vertical velocity it would have to have if it were to escape the Earth’s gravity field after being projected upwards from the surface. , no kinetic energy is lost in the collision: vafter = −vbefore ). How long does the round trip take? 1 Ideal gas basics Gases are a form of matter in which the individual molecules are free to move independently of one another except for occasional collisions. Most of the time the individual molecules are in free flight out of the range of influence of their neighbors.

47) 40 Gases After multiplying and dividing through by ρ, the mass density of the mixture, p=ρ ρ2 ρ1 R 1 + R2 + · · · ρ ρ T. 48) After noting that the volumes are the same for ρi and ρ, we can write Reff = M1 M2 R1 + R2 + · · · M M [effective gas constant for a mixture]. 49) Note that the coefficients in the last equation are mass fractions, not mole fractions. It might be necessary to calculate the effective molecular weight of a mixture (as we have used Md = 29 g mol−1 for dry air). 50) where M is the molecular weight (kg mol−1 ).

What is the velocity of the mass when it strikes the Earth’s surface? (This is exactly the vertical velocity it would have to have if it were to escape the Earth’s gravity field after being projected upwards from the surface. , no kinetic energy is lost in the collision: vafter = −vbefore ). How long does the round trip take? 1 Ideal gas basics Gases are a form of matter in which the individual molecules are free to move independently of one another except for occasional collisions. Most of the time the individual molecules are in free flight out of the range of influence of their neighbors.

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