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visits member for 2 years
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May
18
answered How are matrices used to represent quantities, and what is the meaning of a matrix?
May
11
comment Are intergalactic voids inertial frames?
@rijulgupta the principle of equivalence says that being in a frame where objects experience a gravitational force is equivalent to being in a nonintertial frame.
May
7
answered What is the cause of Special Relativity
May
3
comment How does light bend around my finger tip?
@Virtlink, the ray model is useful and intuitive, just like incorrect ideas can be useful and intuitive, but light is not a particle travelling through space, it is a wave travelling through space (under the classical E&M picture).
May
2
answered Do I need to take weight of the rocket into account when calculating escape velocity?
Apr
28
suggested suggested edit on Trouble with proof about operators in QM
Apr
28
comment How can I compute the angular velocity of a triangle formed by three particles knowing their instantaneous positions and velocities?
I don't understand. Why are we interested in the angular velocity of $\hat{n}$? If it is spinning perpendicular to its plane, won't $\hat{n}$ be zero, while there is nonzero angular velocity?
Apr
25
comment Does electricity flow on the surface of a wire or in the interior?
Great example of litz wire!
Apr
22
suggested suggested edit on Lebesgue integration
Apr
19
awarded  Nice Answer
Apr
18
answered Why are sine/cosine always used to describe oscillations?
Apr
15
comment What are the eigenvalues of the Lorentz matrix?
I recommend you try to answer and interpret the third one for yourself!
Apr
13
revised What is a linear probability density function?
deleted 249 characters in body
Apr
13
revised What is a linear probability density function?
added the answer
Apr
13
answered What is a linear probability density function?
Apr
13
comment Why does pitch in a helicopter take effect 90 degrees later?
Could it simply be that you want the helicopter blade to "bite" for the full 180 degrees centered around the perpendicular position? (by "perpendicular position" I mean where the blade is perpendicular to the aircraft)
Apr
13
comment Relation between shm and circular motion
Note also that $x=a \sin(t)$ $y=a \sin(t\pm \pi/2)$ satisfies $x^2+y^2=a^2$, hence the "differing in phase by $\pi/2$".
Apr
6
answered What prevents an orbiting object from getting a speed which is greater than $c$?
Apr
5
answered How to deal with non fixed springs?
Apr
3
comment Some subtleties in direction of drag force
@CAF you did it again! The equation is already for $v$ in the upwards direction. You don't need to do that, you can just multiply the equation $F=-mg-\mu v$ by $\hat{x}$ and be done with it. The corresponding vector equation is $F \hat{x}=-mg\hat{x}-\mu v\hat{x}$ or $\mathbf{F}=-mg\hat{x}-\mu \mathbf{v}$.