Solving for Speed: Average Net Force & Mass

[uno]

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

 

[heth]

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.

 

[thomate1]

with only the given information. Could you provide more context or equations?

Based on the given information, we can use the formula F = ma to calculate the acceleration of the electrons as they impact the TV screen. We can rearrange the formula to solve for acceleration (a = F/m) and then use this value to calculate the speed of the electrons using the formula v = u + at, where u is the initial velocity (which we can assume is 0 since the electrons are being emitted from the beam). This will give us the average speed of the electrons at impact. However, it is important to note that this calculation assumes that all the electrons are being absorbed by the screen and exerting a constant force. In reality, there may be other factors at play that could affect the speed of the electrons, such as air resistance or the composition of the TV screen. More information or context would be needed to provide a more accurate calculation.