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Results tagged with homework-and-exercises
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user 326281
Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.
2
votes
1
answer
99
views
What is the gravitational field in the middle of a thin rod?
I just calculated the gravitational field on the $x$-axis created by a thin rod of mass $M$ and length $L$ by applying the formula:
I got this:
However there are some issues that I don't get. If I …
-2
votes
1
answer
424
views
Prove dot product between two timelike vectors in Minkowski spacetimw [closed]
In the Minkowski 4-dimensional space-time $(\mathbb{M}^4,\eta)$ the dot product is:
$a\cdot b = -a^0b^0 + a^1b^1 + a^2b^2 + a^3b^3 ~\qquad~ a = (a^0,a^1,a^2,a^3) ~~,~~ b = (b^0,b^1,b^2,b^3)$
Now consi …
-1
votes
2
answers
69
views
Total momentum of a fluid in a pipe [closed]
Suppose we have a cylindrical pipe let's say length L = 10
m and radius R = 1 m through which water is flowing. The velocity distribution is given by Poiseuille's Law: $v(r)=\frac{\Delta P}{4L\eta}\ …