Recent content by Johnstonator
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What would be the ideal cross section of an axially loaded cantilever beam?
Pretty much the title. Just some brain teasers I'm trying to figure out. I can't think of how a cross section would come into play when it comes to axial loading. Buckling? Since the critical force for buckling is proportional to moment of inertia, so theoretically if I have a high moment of...- Johnstonator
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- Beam Cantilever Cantilever beam Cross Cross section Section
- Replies: 2
- Forum: Mechanical Engineering
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Engineering Determining if voltage or current is positive or negative with sources
I think I see it. iΔ only applies when I have Vs =##\alpha## iΔ. I forgot to think about that iΔ can be ignored. I want to say use KVL/KCL here but that doesn't seem right to me?- Johnstonator
- Post #10
- Forum: Engineering and Comp Sci Homework Help
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Engineering Determining if voltage or current is positive or negative with sources
##\alpha## is 400 V/A. Vs =##\alpha## iΔ , where, Vs = -6V, iΔ= -15mA, so ##\alpha## = 400V/A. So it sounds like I can't say iΔ (-15mA) is the value of the current going through the dependent voltage source then?- Johnstonator
- Post #8
- Forum: Engineering and Comp Sci Homework Help
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Engineering Determining if voltage or current is positive or negative with sources
So the main takeaway is that whenever I see iΔ I just have to know that only applies to the dependent voltage source equation (v = alpha* i), and then ignore that for everything else? For the 6V Voltage source, the power would be negative. P = -i v, where i = 15mA, and v = 6V. For the...- Johnstonator
- Post #5
- Forum: Engineering and Comp Sci Homework Help
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Engineering Determining if voltage or current is positive or negative with sources
So I'm confused on a few things about this circuit. I know my math is right (since I got the absolute values correct), but the signs are off since I can't tell when the voltage, current or if the general power equation is positive or negative. A) So my first question is, where is the current...- Johnstonator
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- Current Negative Positive Sources Voltage
- Replies: 10
- Forum: Engineering and Comp Sci Homework Help