The average speed of a nitrogen molecule in air is about 6.70 ? 10 2 m/s, and it

Question

The average speed of a nitrogen molecule in air is about 6.70 ? 102 m/s, and its mass is about 4.68 ? 10-26 kg.

(a) If it takes 3.50 ? 10-13 s for a nitrogen molecule to hit a wall and rebound with the same speed but moving in an opposite direction (assumed to be the negative direction), what is the average acceleration of the molecule during this time interval?

                                        mls^2

(b) What average force does the molecule exert on the wall?

                                             N

Explanation / Answer

The velocity equation for constant acceleration are:

Vf = Vi + AT

where:

T is is the time interval

Vi is the velocity at the beginning of the interval

Vf is the velocity at the end of the interval

A is the acceleration

You have the time and the initial and final velocities so you can compute A.

Then you know that F = MA so, since you have M and A you can compute F

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