Solving for Speed: Average Net Force & Mass

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SUMMARY

The discussion focuses on calculating the average speed of electrons impacting a TV screen, given a beam of approximately 1.0 x 1015 electrons per second, each with a mass of 9.1 x 10-31 kg, and an average net force of 0.9 x 10-7 N exerted on the screen. The relevant formulas provided are Favg = p/t and p = mv. By rearranging these equations, participants can derive the average speed of the electrons at impact.

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1. A beam consisting of around 1.0 1015 electrons per second, each of mass 9.1 10-31 kg, paints pictures on the face of a TV tube. Assuming that the electrons are absorbed by the screen and exert an average net force on it of 0.9 10-7 N, what is their average speed at impact?



2. Favg = p/t and p=mv



3. These are the two formulas given, but I'm not sure how to solve for speed
 
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Try starting the problem, and writing down your thought process.

Write and sketch about what you already know from what the problem tells you - then see if you can use that to work out what you don't yet know.
 

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