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seen Apr 20 at 9:25

Aug
31
comment Why do rainbows have distinct colors?
@dushya Why is that so? Can you elaborate?
Aug
19
comment Do processes $P\propto\frac{1}{V^2}$, $P\propto\frac{1}{V^3}$, $P\propto\frac{1}{V^4}$, etc., exist in the real world?
Thanks for replying. In your answer, you also mentioned that $PV^n=const$ is not likely to occur naturally other than in the special cases mentioned. Does this also mean that there are no engineering applications?
Aug
18
comment Do processes $P\propto\frac{1}{V^2}$, $P\propto\frac{1}{V^3}$, $P\propto\frac{1}{V^4}$, etc., exist in the real world?
Thanks for answering. Just one thing, you said that we can force a system to follow any relation we want by simultaneously controlling the container volume & the temperature. Does this imply that $PV^n=const$ can never occur at constant temperature except for n=1?
Mar
22
comment How can an an ant lift 50 times its own weight and pull 30 times its weight?
This is the relevant section from your link: But in the rest of the universe, the scaling is actually much slower. Body mass increases along three dimensions, but the strength of legs and arms, which is proportional to their cross-sectional area, increases along just two dimensions. If a man is a million times more massive than an ant, he will be only 1,000,000 to the two-thirds power stronger: about 10,000 times, allowing him to lift objects weighing up to a hundred pounds, not thousands.
Mar
22
comment How can an an ant lift 50 times its own weight and pull 30 times its weight?
Thanks a lot for your answering & also for the interesting link.But my question is but how can you say that strength is related to Area of cross section of the muscle? A Google search did not give me a satisfactory definition of 'Strength' & its relation to the muscle's cross sectional area is not mentioned anywhere. Can you clarify?
Mar
22
comment How can an an ant lift 50 times its own weight and pull 30 times its weight?
Thanks. Your answer made sense but how can you say that strength is related to Area of cross section of the muscle? A Google search did not give me a satisfactory definition of 'Strength' & its relation to the muscle's cross sectional area is not mentioned anywhere. Can you clarify?
Mar
14
comment How can an an ant lift 50 times its own weight and pull 30 times its weight?
@Manishearth I'd like referenced claims. By the way, how long will it take for the mod to migrate this question?
Mar
14
comment How can an an ant lift 50 times its own weight and pull 30 times its weight?
@Manishearth I'll post the same question on Skeptics.
Feb
28
comment Question involving Vectors and Forces
I got $Fcos\alpha=600$ - a relation between $F$ and $\alpha$ but how do I get a second relation involving $\beta$? Any suggestions? And thanks for answering :)
Feb
28
comment Question involving Vectors and Forces
I've modified the image. It now looks closer to the picture in the text book.
Jan
23
comment Basic question about law of gravitation
@Bernhard I just took 10 km as an example. What I really wanted to know was how to solve the problem considering the variation in distance.
Jan
23
comment Basic question about law of gravitation
@LuboŇ°Motl Can you give a more detailed answer? I'm familiar with differential equations (though I don't claim to be an expert) I'll try to grasp whatever I can.
Nov
19
comment What is the physical meaning of a product of vectors?
@PeterShor What other vector would you recommend to get an intuitive feeling for products? And please explain why the same technique can't be applied to Displacements too? After all, they are vectors too aren't they?
Nov
19
comment What is the physical meaning of a product of vectors?
Note that I said that vectors are quantities that behave like displacements. I never said that vectors are quantities that cause displacement. Please clarify.
Nov
19
comment What is the physical meaning of a product of vectors?
@mcandril I think we can think of vectors as displacements. In your example, the wall doesn't move because the resultant of forces is zero that is, the wall exerts a normal force which cancels out your weight. In terms of displacement, it is the same as walking from A to B(your weight) & walking back following the same path backwards from B to A (normal force) & hence you have no apparent change in position.
Nov
17
comment What is the physical meaning of a product of vectors?
Thanks for answering but I didn't understand anything because I'm not familiar with abstract algebra :( And further, since we are using vectors in Physics, I believe there must be a physical way of looking at vectors rather than an abstract mathematical one.
Nov
17
comment What is the physical meaning of a product of vectors?
Why can we not think in terms of displacements? Aren't they vectors too?
Nov
17
comment What is the physical meaning of a product of vectors?
@Georg Still didn't understand what a product of displacement means :(
Nov
17
comment What is the physical meaning of a product of vectors?
@Georg Can you give an example?
Sep
2
comment How can area be a vector?
What you said makes sense though I'm not fully satisfied. Thanks a lot :)