May 12, 2009 · The discussion focuses on determining the linear independence of four vectors represented as 1x4 matrices: v1 = [1,4,2,8]^t, v2 = [2,5,3,9]^t, v3 = [11,14,12,18]^t, and v4 = …

Mar 2, 2026 · I received a warning message about "Unacceptable references or topics." I'm new to this site. Does this mean I have to delete the reference I provided, or all the posts? It's a very traditional …

Feb 12, 2026 · Regarding Relativity of Simultaneity, is a non-local "now" impossible? "Why do some people claim against that, although not Relativity-fundamental, "there...

Feb 6, 2026 · would be good to add an additional prefix for questions that are more 'science journalism' and about trends in a given scientific community rather than a quantitative dive into a specific model …

Jan 27, 2009 · For the arm on my small one we used a 1x4. We left the end holding the counterweight full width, but tapered it about 1.5 cm past the axle on the side with the projectile. Barely even took a …

Aug 23, 2011 · The chemical formula for diesel fuel is often represented as C12H23, although this is an empirical formula rather than a structural formula. Diesel is composed of a complex mixture of …

Feb 13, 2026 · What should be good aproximation for amplitides? So I started with calculatin k for this wire from hooke law and young modul , and I use statement that "spring" folows hooke law only in …

Feb 13, 2026 · Welcome to PF, Willy. It's good to have you here. Depending on the type of question, you might post in the Mechanical Engineering forum (for waterflow type problems or structure …

Apr 24, 2025 · I'm unsure of what is required here. I assume I can edit this later so I won't stress.

Feb 6, 2026 · A slab rests on two massless rollers of different radii such that the angle of the slab's inclination is ##\\alpha##. There is no slipping between the slab and the rollers, nor between the …