Hi how long steel wire can be allowed to hang freely, if the tensile stress due to the weight of the steel wire must not exceed half the stretching limit. The density of the steel wire is 7800kg / m cube and the streching limit is 220 N / mm. Is there anyone out there that can hela with this? Thanks
+Rahul Tiwari Sometimes in questions you can treat the wire as though it were ideal ( meaning the wire is massless and all the mass is concentrated at the object at the end).
Hello :) Thanks for your videos. They are very clear. I would like to ask you ... are the maximum stress values for anything (in this case it is aluminium) all experimentally determined?
+Tenerezza jie Yes, all these values are experimentally determined. The CRC (a book) is a source of thousands of pages of experimentally derived information.
Sine the maximum stress is the RATIO of F/A the maximum stress is the when that maximum ratio is exceeded. (twice the cross-sectional area will require twice the force).
We are assuming that the force is applied gradually until it breaks. If the force is applied suddenly, like with a hammer, we have to take into account the principle of impulse.
Michel van Biezen sorry what I should have asked was does it matter if it was applied with tension or no matter how the stress is applied that the most of any stress it can handle
I agree that the answer appears to be small, but I don't see any error in the calculation or the equation.
thank you very much , you are a life saver.
I wish you are my physics professor .
Does increasing the length of the wire without increasing the cross sectional area have any effect on the load it can hold?
Thanks again
No, the length has no effect (unless the weight of the wire is significant).
Wouldn't you have to calculate the new surface area using Poisson's ratio to determine the answer?
We are ignoring that here.
Thanks
Hi
how long steel wire can be allowed to hang freely, if the tensile stress due to the weight of the steel wire must not exceed half the stretching limit. The density of the steel wire is 7800kg / m cube and the streching limit is 220 N / mm. Is there anyone out there that can hela with this? Thanks
sir do the wires which are made of the same material experience the same tension
are you sure we can only hang 17kg on it. so that means a person a brake it buy pulling on it by hand??
sir u calculated mg force of the small mass only but what about the mass of the wire
+Rahul Tiwari Sometimes in questions you can treat the wire as though it were ideal ( meaning the wire is massless and all the mass is concentrated at the object at the end).
thnks
Hello :) Thanks for your videos. They are very clear.
I would like to ask you ... are the maximum stress values for anything (in this case it is aluminium) all experimentally determined?
+Tenerezza jie
Yes, all these values are experimentally determined. The CRC (a book) is a source of thousands of pages of experimentally derived information.
Is maxium stress meaning that no matter how you apply the force that is the breaking point?
Sine the maximum stress is the RATIO of F/A the maximum stress is the when that maximum ratio is exceeded. (twice the cross-sectional area will require twice the force).
Does it depend on how the energy is applied?
We are assuming that the force is applied gradually until it breaks. If the force is applied suddenly, like with a hammer, we have to take into account the principle of impulse.
Michel van Biezen sorry what I should have asked was does it matter if it was applied with tension or no matter how the stress is applied that the most of any stress it can handle
Yes, it does matter. Stress caused by tension typically has lower limits compared to stress caused by compression.
Great job
Thank you.
How to find max stress 🤔
You need to find out what the maximum strength of the material is. (This needs to be given in the porblem, or it can be determined experimentally).
@@MichelvanBiezen oh right ❣️
Isn't the R 0.005m?
why you did't convert kg into g
What specific operation are you referring to?