Engineering Question about a circuit to be solved with Norton's theorem

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When short-circuiting terminals a-b in a circuit, the 5-ohm resistor can be ignored because it is effectively in parallel with a zero-ohm resistor, resulting in zero resistance. This principle is rooted in the fundamentals of circuit analysis, specifically applying Norton's theorem. The discussion highlights a common misunderstanding among newcomers regarding the impact of short circuits on resistors. The user expresses gratitude for the clarification and acknowledges a mix-up in referencing the correct figure. Understanding these concepts is crucial for effective circuit analysis.
link223
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Homework Statement
See picture please, it is highlighted in yellow.
Relevant Equations
Norton's theorem
Hello guys, I am new here.
I was wondering whether I could get some help about the highlighted part. What I don't understand is why we are able to ignore the 5-ohms resistor when we have short circuited terminals a-b.

Thanks in advance.
1650705027062.png
 
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Welcome to PF.
link223 said:
What I don't understand is why we are able to ignore the 5-ohms resistor when we have short circuited terminals a-b.
Because a zero ohm resistor in parallel with a 5 ohm, (or any other resistor) is going to be zero ohms.
 
Baluncore said:
Welcome to PF.

Because a zero ohm resistor in parallel with a 5 ohm, (or any other resistor) is going to be zero ohms.
Thanks! and thanks once again! I didn't think this through then.. makes total sense (also just noticed I was looking at fig(c) not (b) :'D) Thanks though!
 
Thread 'Why wasn’t gravity included in the potential energy for this problem?'

Thread 'Why wasn’t gravity included in the potential energy for this problem?'

I’m looking at the attached vibration problem. The solution in the manual includes the spring potential energy but does NOT include the gravitational potential energy of the hanging mass. Can someone explain why gravitational potential energy is not included when deriving the equation of motion? I tried asking ChatGPT but kept going in circles and couldn't figure out. Thanks!
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