Samama Fahim
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 Apr 25 awarded Popular Question Apr 11 awarded Popular Question Mar 31 comment Work done should be positive but coming out negative? The work done by gravity in moving an object from some initial distance $r_i$ from the center of the earth to some final distance $r_f$ is given by the expression $-GM_em \left[\frac{1}{r_i} - \frac{1}{r_f} \right]$ or $\frac{GM_em}{r_f} - \frac{GM_em}{r_i}$; if $r_i = \infty$, the second becomes $0$, and the work done by gravity comes out to be positive. Mar 28 comment Is the displacement vector tangent to the circular path? Perhaps, an infinitesimal displacement vector, $d\mathbf{r}$, that is tangent to the circle at some point $(x,y)$ approximates the path between the two points of the circle $(x, y)$ and $(x+dx, y+dy)$ or we could say that If $s$ is the arc-length between two infinitesimally close points on the circle, then $s = |d\mathbf{r}| + \epsilon$, where $\epsilon$ is an infinitesimal. Feb 1 awarded Popular Question Jan 10 comment A doubt in special relativity @Prahar Why did you downvote? Jan 3 awarded Notable Question Dec 14 awarded Famous Question Nov 17 awarded Famous Question Oct 31 comment Why is only one end at rest when a rope is attached to a cube? Why the cube and the rope have to have the same acceleration if they are attached? Oct 31 revised Why is only one end at rest when a rope is attached to a cube? deleted 20 characters in body Oct 30 accepted Why is only one end at rest when a rope is attached to a cube? Oct 30 revised Why is only one end at rest when a rope is attached to a cube? Added 6 symbols Oct 30 suggested approved edit on Why is only one end at rest when a rope is attached to a cube? Oct 30 asked Why is only one end at rest when a rope is attached to a cube? Sep 30 awarded Popular Question Aug 17 accepted What's the surface area of a liquid? How does evaporation increase if the surface area of a liquid is increased? May 18 awarded Popular Question May 7 awarded Popular Question May 1 awarded Notable Question