Now I have got a method to get it directly.And again it came out to be an easy problem. Maybe you'll want to try again after knowing the answer to it, which comes out to be:$$I= \dfrac{m}{12}(a^2+c^2)$$ Hint (You'll get final answer after seeing this image hint , So, if you want to try again p...

There is this famous example about the order difference between gravitational force and EM force. All the gravitational force of Earth is just countered by the electromagnetic force between the electrons on the surface of my feet and the ground. But also wave-function of electrons(fermions) do n...

I've been wondering, what causes the normal force to exist? In class the teacher never actually explains it, he just says "It has to be there because something has to counter gravity." While I understand this is true, it never explains why. Whenever I ask anyone else they always respond in a s...

The "flair" link in the profiles for people with all-Unicode usernames is broken. For example, clicking on it for this guy links to this page. What's happening here is that the flair link is http://site.stackexchange.com/users/<userid>/<username slug>/flair. For such usernames, the slug is blan...

I have thought about this question for quite some time. The theory that I highly believe in is about string theory. The theory states that the space in between subatomic particles are almost massless strings from type 2a string theory. These string have so little mass (roughly .83 x 10 to the -5 ...

Blame Pekka for this answer, he put me up to it ;-) . Enough cats, Pekka? Yes, we need something linkable. The FAQ is an ideal place for this, but there are lots of other similar things that can go there as well. We don't want to bloat the faq, too few people read it already. Still, this par...

Suppose there is a cuboidal vertical tunnel , and a cubical block in it such that all surface of the block are in contact with the four walls of the cuboidal tunnel respectively . All walls of the tunnel are rough with different $\mu$s . And the weight of the block is $m$ and it is a point mass s...

In the TV show "Breaking Bad", Walter White frequently gets rid of people who get in his way by submerging them in a plastic container full of hydrofluoric acid. This, at least in the TV show, completely dissolves the body leaving nothing but a red sludge behind at the end. Is it actually possib...

Watching some movie/TV this question came to mind, purely theoretical of course, if one wanted to dissolve a human corpse, like getting rid of a body after killing someone, is it better to use an acid or a base? In the movies (as well the popular perception for some reason) they always use acid. ...

Don't worry... I won't actually do it, just would like to know how.

Kill all the turtles on which it rests.

I was attending my philosophy class and in the middle of student presentations, I found myself mentally wondering off and thinking about light. After a few minutes of trying to piece together how the sun works I came to ask a question I could not answer myself. Why does each individual photon hav...

Linked to this Comparing Static Frictions Suppose there is a cuboidal vertical tunnel , and a cubical block in it such that all surface of the block are in contact with the four walls of the cuboidal tunnel respectively . All walls of the tunnel are rough with different $\mu_s$'s . And the weig...

For a Reissner–Nordström or Kerr black hole there is an analytic continuation through the event horizon and back out. Assuming this is physically meaningful (various site members hereabouts think not!) does this change the genus of spacetime? In the 2D rubber sheet analogy a loop drawn around th...