# Search results

1. ### A Question about Entropy

Our universe is considered a closed system. Law says that the entropy of a closed system is bound to increase. Then how could living beings evolve when they are an extremely ordered system?
2. ### B What is the reason for the Emergence of properties?

Water molecule has different properties from either oxygen or hydrogen atom. My question is 'Are these properties of water molecules totally new or were these properties already lurking around in the oxygen and hydrogen atoms?' Thanks.
3. ### B Question about Curvature caused by Mass

A body is moving in deep space substantially away from others influences of gravitational force ( just assume). Suddenly, a big planet appears in It's vicinity. As per relativity it's not some force issuing forth from the planet that attracts the body towards itself. The body just keeps on...
4. ### B Instantaneous Reactions

Do instantaneous Reactions happen at infinite speed?
5. ### B Effect of the Sun's Gravity on the Moon

Is the gravitational pull of Sun on moon greater than the gravitational pull that Earth has over moon? Thanks.
6. ### B Mechanism of Curvature of Space

Hi all, How does matter curve space (what's the mechanism)? Does this Curvature happen instantaneously or does it happen at light speed? Thanks in advance.
7. ### B Movement from A to B

Hi Any line joining points A and B has infinite points. So, when I move from A to B, do I cross infinity?
8. ### When can we say something is fully understood?

My friend told me that the process of common salt preparation is fully understood.... I asked him how come there's a loss and gain of electrons in this process.. He told me because of attraction and repulsion. I asked him how does attraction and repulsion take place between charged...
9. ### Mass of a photon

Photon's rest mass is zero. What's its 'moving' mass? Thanks.
10. ### Nobel Prize in Physics for Relativity?

Why didn't Einstein get Nobel Prize for ' Relativity' Has anyone else been awarded Nobel Prize for 'Relativity'?
11. ### B Properties of an electron

An electron displays both wave and particle like properties. Does it exhibit these at the same time or at different times?
12. ### The use of the word 'model' in science

It is often said that science is a 'model' of reality out there. I think this statement is wrong. It presupposes that there is a reality that is beyond 'modelling'. Suppose, someone really finds out the reality 'as it really is'. ( I am not saying there surely is). She would first of all...
13. ### B Meaning of the word 'instantaneous'

" an electron emits a photon instantaneously" or consider other instantaneous reactions. What is meant by instantaneous here? Does it mean there is no time lag between the emission? Does it mean that the emission takes place at a speed greater than the speed of light?
14. ### Earth's motion around the sun

Earth moves around the sun in an elliptical path. When it comes close to the sun it speeds up. When it goes far, it slows down. This is acceleration and deacceleration. Why don't we feel both of these? I have read about it but haven't got satisfactory explanation.
15. ### B Why do objects move?

Hi all, Molecules have different degrees of freedom. So, when I push a wooden block, why doesn't all the energy that I provide via a push contribute to the degrees of freedom of the molecules of wood? ( my hand is also made of molecules, so it's basically molecules dealing with molecules )...
16. ### B Question about attraction

Hi, I fail to understand attraction with the 'two people throwing balls at each other' analogy. Please help.
17. ### A question about units

Aa...ha.... I can log in now.... So, without wasting much time (one never knows how much time one has...) My next question.... I saw the list of derived units on wikipedia. All of them had the basic units either multiplied or divided. Why aren't basic units added or substracted to get...
18. ### A question regarding action and reaction

I hit a bench with my fist, I experience equal and opposite reaction.... Science says, it is because the nuclei of the atoms of my fist come close to the nuclei of atoms of the bench and experience repulsion. Am I on the right track?.....Are there other explanations?
19. ### Motion on an inclined plane

While deriving formulas/describing motion on an inclined plane, why don't we take into account the shape of the object undergoing motion? e.g. 1. If I take an inclined plane and place a ball on it, only a small amount of inclination would make the ball move down the plane... But... 2. If a...
20. ### A question about inertia

Force is something that causes acceleration... Inertia is something that opposes acceleration... Can inertia be understood as some kind of negative force prevelant everywhere in the universe? (Hope this doesn't get locked/deleted, these days one can't even think safely)
21. ### A question regarding enquiry

Can the enquiring spirit in us be ever quenched? e.g. 1. Suppose, science finds the fundamental particle...next question can be...What mechanism caused this fundamental particle?....or.....How it came about? If someone says, it has been always there...one can ask...What is the mechanism...
22. ### Why do we like natural scenery?

Why do most of the people like natural scenery (with varying degrees, of course)? Is it in our genes? Does it serve an evolutionary purpose? Any thoughts?
23. ### Is Zeno's paradox valid

Zeno said that you can't finish or start a race because there is an infinty of points between any two points. Let's take a distance of say 1meter. As per zeno there is an infinity of points in this distance. So, what is the size of each of these points. Of course, 1/infinity=0. i.e. each point...
24. ### A question about discreteness of light

A stream of light is said to be discrete and not continuous because it consists of packets of energy called photons. Is there any space between the constituent photons of light? If not, isn't this also a continuity in its own sense?
25. ### What is it PUSH or PULL

When a ball falls towards Earth, what is actually happenning.... Is the earth PULLING the ball? or Is the space PUSHING the ball? (Be assured that I can understand you. Before becoming a teacher of literature, I studied Physics, Chemistry and Mathematics upto graduation level. The previous...
26. ### A question about E=mc^2

If i put c=d/t in E=mc2, then E=m×d2/t2 Now take m=1kg and d=1m Does this mean that E is inversely proportional to time?
27. ### Can matter/energy be eternal?

I was listening to Lawrence Krauss. I quote roughly what he said, 'Our universe had a beginning. But it is not required, though. It could well have been eternal.' My question is, Can matter/energy be eternal? If yes, has any mechanism been proposed for such an existence?