Which of the following statement is incorrect about weather?

It is a local phenomenon which occurs only at low altitudes

It is regarded to be in a thermal equilibrium, with negligible external influences

It has very little impact on mean thermodynamic properties of the atmospheres

It is under constant perturbation due to winds and two-phase non-equilibrium of water vapour & carbon dioxide vapour on Mars and Earth respectively

Correct Answer : It is under constant perturbation due to winds and two-phase non-equilibrium of water vapour & carbon dioxide vapour on Mars and Earth respectively

Explanation : Weather is a local phenomenon which occurs only at low altitudes of the atmosphere. At low altitudes, the atmosphere is assumed to be in thermal equilibrium & is not influenced by external factors like electromagnetism or chemical reactions. But it is constantly disturbed by horizontal winds and two-phase non-equilibrium due to water vapour on Earth & carbon dioxide vapour on Mars.

Recently Updated in Spaceflight Mechanics Questions

Using Toussaint's formula, what is the temperature of air at a geopotential altitude of 4 km?

231 K

250 K

255 K

262 K

Correct Answer : Option (D) : 262 K

Explanation : Toussaint’s formula is given by T = 15 – 0.0065h
Where, T is the temperature in Celsius and h is the geopotential altitude in metres.
Therefore, T = 15 – 0.0065*(4000)
= – 11°C
= -11 + 273 K
= 262 K

U.S. Air Force defines the ____________ as the boundary between earth's atmosphere and space.

Karman line

Van Allen belt

Beginning of exosphere

Beginning of mesosphere

Correct Answer : Option (A) : Karman line

Explanation : The beginning of space is officially denoted at an altitude of 100 km which is also known as the Kármán line. After this line the aerodynamic effects are minimal. Cold gas thrusters are used to correct orientation after this line as aerodynamic control surfaces are useless.

What is the temperature of air if the pressure and density are 629.66 lb/ft² and 0.9408 x 10^-3 slug/ft³. Given specific gas constant is 1716 lb.ft/slug.⁰R.

125 ⁰R

225 ⁰R

250 ⁰R

390 ⁰R

Correct Answer : Option (D) : 390 ⁰R

Explaination : Given,
Pressure (p) = 629.66 lb/ft²
Density (ρ) = 0.9408 x 10^-3 slug/ft³
Specific gas constant (R) = 1716 lb.ft/slug.⁰R
Using equation of state,
Temperature, T = p/(ρR)
= 629.66/(0.9408*10^-3*1716)
= 390 ⁰R