 3:41 AM
1  I do a lot of fibrework (carding wool, spinning yarn, weaving, etc.) and I've noticed a funny behaviour that anything long and flexible, which can withstand significant torque exhibits. If I take a piece of yarn and begin to twist it, it remains twisted so long as I keep it in tension (the piece ...

1 hour later… 4:43 AM
2  I can find 3 displacement $\vec d_1 ,\vec d_2, \vec d_3$ and use them as basis so that a displacement is $\vec d=a\vec d_1 +b\vec d_2+c \vec d_3$. I can find 3 forces $\vec F_1 ,\vec F_2, \vec F_3$ and use them as basis so that a force is $\vec F=a\vec F_1 +b\vec F_2+c \vec F_3$. So the basis are...

17 hours later… 9:31 PM
2  In my physics course, we are doing an experiment rolling disks and spheres down an incline (assuming there is no slipping). In doing the derivations (assuming a moment of inertia of $\frac25mR^2$ for sphere and $\frac12mR^2$ for disk) I have derived that the final velocity should be \$\sqrt{\frac{...

1 hour later… 10:52 PM
4  Electric field due to two opposite charges According to the answers in the previous questions, if you separate the two charges from each other, they will produce a non-zero electric field everywhere in space. (This field will get very weak, but still non-zero, at locations much further from ...