Calculate the mean free path of air molecules at a pressure of 7.00×10^−13 atm and a temperature of 303 k . (this pressure is readily attainable in the laboratory.) model the air molecules as spheres with a radius of 2.00×10^−10 m .

82.8986 km

Explanation:

Given:

Pressure = 7.00×10⁻¹³ atm

Since , 1 atm = 101325 Pa

So, Pressure = 7.00×10⁻¹³×101325 Pa = 7.09275×10⁻⁸ Pa

Radius = 2.00×10⁻¹⁰ m

Diameter = 4.00×10⁻¹⁰ m (2× Radius)

Temperature = 303 K

The expression for mean free path is:

Boltzmann Constant = 1.38×10⁻²³ J/K

So,

Mean free path = 82.8986×10³ m = 82.8986 km

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement