Recent content by annatar

Is it possible for one kind of molecule to be the cause of various odors? Maybe... this will happen when different parts of the molecule bind to the receptors in my nose?

In VSEPR theory, lone pairs repel each other more strongly than bonding pairs do, therefore they bend the molecule and determine its geometry. But why does that happen? What makes the repulsion stronger? Thanks for your help

Very interesting indeed! Thank you :wink:

Ah ha! So this is our misconception. Funny, that neither of us would understand the true answer Actually, he also tried to formulate the situation using conservation of energy. i.e. the object's P.E. got converted to K.E. as it accelerates towards the B.H. The P.E. equation he used is...

Ok, so I will tell him : "By G.R. ... Gravity will NOT become infinite, and it still cannot accelerate to light speed because of the energy requirement.” ? Sounds not so convincing :-p

Infinite mass = infinite gravity !? Someone asks me this: There is an object (in free space) attracted by a black hole and accelerates towards it. Can the object be accelerated to light-speed-1？ I instinctively replied that "By Special Relativity, the mass will approach infinity as it moves...

Thanks guys...I think I got it :smile:

Hmm,so when the ambulance is coming/leaving, the sound heard will have a higher/lower frequency than the wave source, but remains steady at that frequency? If the ambulance is accelerating directly towards you...I guess the frequency will rise then?

When an ambulance approaches, its siren sounds shriller than when I relatively motionless to it, and vice versa. Such is an example of doppler effect, isn't it? However, there one thing I am not sure: does the siren gradually becomes more shriller when the ambulance approaches, or not...

From what I read, there is an extremely small probability of one going through a solid wall, according to QM. The chance is so small you might have wait a few lifetimes, or more of the universe to observe it. But how about going very shallowly into the wall? Let's say a few angstroms (Å)...

Maybe I should be specific : what is the origin of metallic luster? How does their reflection mechanism makes them especially shiny?

Ok, ok... Assuming adequate light and a piece of smooth metal, structurally why the metal is shinny?

Just want to make sure my understanding is correct... Here it goes: 1. Metals have free electrons, which can be in a myriad of energy levels, including those corresponding to the full range of frequencies in the visible region of the spectrum. 2. Light shone on a piece of metal thus...

Homework Statement What is the magnitude of force F (which is pushing from the left on M) required to keep M1 and M2 relatively at rest to M? Ignore all friction. See attached diagram Homework Equations Newton's laws The Attempt at a Solution Well...If M is at rest, M1...

I guess the OP is talking about the theorems that help us to find centers of masses