Recent content by gladius999

Hi guys, I'm wondering how the wall of the cantilever beam (a beam fixed at one end at a wall) can exert a reaction moment? Is this done by the wall pushing back on the cantilever beam away from its centroidal axis? Also is the reaction moment always applied to the centroidal axis of the...

I have tried this and you are correct sir. I think this clears up the problem now. So what I am getting is that y has to be linear in order to be able to sum up all the moments like this? Is there a specific section in mathematics which I can research more or find algebraic proof for this...

Yes I understand I am splitting the T into two rectangles. But isn't that the same case with the FMOA as you are taking y as the distance from the axis at the center of the top rectangle to the centroidal axis? The axis through the center of the top rectangle is not the same as the centroid for...

Hello RockFreak, Thank you for your detailed and swift response. I have just one thing unclear now. To get the correct answer you need to incorporate the parallel axis theorem but what I don't understand is why it is needed according to the definition of the second moment of area (as the...

Hi guys, I know the 2nd moment of area about the z axis is defined as the integral of y^2dA, where y is the distance from the centroidal axis and dA is the elemental area. There is also derived formulas for working out the 2nd moment of area derived from this such as for a rectangle is...

hi tiny-tim, I think i meant resultant moment then haha. An object subject to force that is not on its centre of mass will experience a moment would it not? Is that moment only around the centre of mass or does it apply to every point on the body?

If a rigid body has a net moment e.g. rotating clockwise at 2Nm moment about the centre of mass, does every point on the body have 2Nm moment? Or just the point at the centre of mass have a net moment? Thanks

Good sir, would you say my reasoning(shown below) is correct?: I think it makes sense to have a stress in the bar even if only pulled by one side because if we view the bar as consisting of many small bars added together, when a force is applied to one end, all of the bars must feel a...

Thanks for both your replies. It appears to me that there seems to be some contradiction between you two. So what I'm getting here is, that if a uniform bar is in free space(with no gravity, resiistance) and no end fixed but only one end being pulled by a force F, the bar does feel a stress at...

If a uniform beam was in space (no gravity or resistance of any kind) and only was applied a force F on only one side, does the inside of the beam feel a stress and deform? If so, what does the stress equal? Can you explain why/why not the beam feels a stress or not? I know that that if...

What is the point of repeating the TR 90 degree pulse in MRI? I understand you must modify the TR time to get different T1 times, but since the echo signal is read, would'nt all the echo signals be read to the same intensity after a 90 degree pulse?

i think its to do with huygens sources?

Sorry was there any confusion in my post?

Hello, I'm pondering on why bending occurs most when the width of the aperture is close to the wavelength of the propagating wave. According to Huygen's principle, should'nt there be point sources around the edges of an aperture regardless of the width and thus the bending propagate to...

Sorry I do not understand the difference between thermodynamically reversible and reversible. My chem standard is only up to 1st year university. Can you explain this? Thank you for your graphs. What I do not get though is why there is a minimum curve. I understand that in the forward...