Momentum

Classical Mechanics Level 2

Calculate the momentum of an electron moving at one-third the speed of light. (in Ns \text{Ns} ).

If the answer can be expressed as 9.1 ⋅ 1 0 x Ns 9.1 \cdot 10^x \text{ Ns} , then find the value of − x -x .


The answer is 23.

Abhiram Rao by Abhiram Rao , 18, India

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2 solutions

Anshul Sanghi
Aug 6, 2016

Speed of light =3×10^8.
Mass of electron =9.1×10^-31.
Momentum=mass×velocity.
So the answer is 23.


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Steven Chase
Aug 7, 2016

Since the electron is going at a relatively large fraction of the speed of light, one must actually incorporate the Lorentz factor into the momentum calculation. This gives about 9.66 out in front instead of 9.1.

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