# Homework Help: Algebraic expressions for the amount of time that elapses

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1. Sep 26, 2016

### emily081715

1. The problem statement, all variables and given/known data
A single gas molecule of inertia m is trapped in a box and travels back and forth with constant speed v between opposite walls A and B a distance l apart. At each collision with a wall, the molecule reverses direction without changing speed.Write algebraic expressions for the amount of time that elapses between collisions with wall B.

2. Relevant equations
Δp=-2mv

3. The attempt at a solution
i know that the equation does not depend on mv, and must involve l and v. I believe that the equation should be something along the lines of 2lv. can anyone work through this to make sure it is correct with me

2. Sep 26, 2016

### RUber

v is given in distance/time, so an expression for time would require distance divided by v to get units in time.

3. Sep 26, 2016

### emily081715

thank you i already solve the question on my own though

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