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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
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Jan
10
comment A doubt in special relativity
@Prahar Why did you downvote?
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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?
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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?
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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?
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accepted What's the surface area of a liquid? How does evaporation increase if the surface area of a liquid is increased?
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