I just love philosophy. So if you (and the mentors) never mind for this occasion...
I guess I can't deny my existence. Cause the moment I deny it is actually the moment I accept it for proving the existence of my denial. So I exist. ["I think, therefore I am." - Rene Dascartes]
Okey I admit this...
Thanks.
So I conclude - dimensional analysis works for equations; but it will work for proportionality only if the constant is unit less. (The book was a bit confusing.)
It never seems to be the case. Serway's book describes it as a general procedure. Here is the excerpt from Serway's book:(as this page can be previewed in amazon; I think it never breaks any copyright)
Now this certainly works for x ∞ (a^n)(t^m); but what happens when we apply this for...
Wait, I have another question. In law of gravitation we know F = GmM/r^2 Here G is a proportionality constant, isn't it? Then how come it is not a pure number (ie it has units like) 6.67×10^−11 N·(m/kg)2 ?
This is actually an example from Physics for Scientists and Engineers by Serway. I am confused about the way they solved it.
Homework Statement
Suppose we are told that acceleration a of a particle moving with uniform speed v in a circle of radius r is proportional to some power of r, say...
As Nugatory said, objects of different masses feel different gravitational force. Now, I think your confusion is, if masses feel different magnitudes of gravitational force how come they accelerate at same rate? Right?
In other words you are asking if F is different how can g be same?
You...
For both reasons; I think.
Cotton is more electronegative (then wool) implies Cotton atoms' (outer shell) electrons are more tightly held than wool.
Wool is less electronegative (then cotton) implies Wool atoms' (outer shell) electrons are more loosely held than cotton.
Hey, thanks a lot. :-)
But I wonder why while writing intro physics books they never clarify this. I started this thread just for kicks but in the end I have learned something important.
I am beginner intro physics student. So I might be lacking in concept. That said; when we study 1D kinematics don't we consider 1D quantity like 1D velocity. 1D acceleration as vectors?
If we multiply velocity with time, we get displacement. How can we multiply two vector and get a vector? (I thought it is possible only under cross multiplication, but you reminded me that cross multiplication is only for 3D.) So how do we multiply the 'vector' time with any other vector...
how to multiply then?
Hmm, so time IS a vector. But what happens when we multiply time with a vector quantity like velocity? Will it be a cross or dot? (cross maybe? because displacement is a vector...) And what will be the angle between? I am confused.
Ok I am not serious here. I was just wondering - as for us, time always moves forward; doesn't that mean time have a direction? So why not call it a vector? :-)
I am reading introductory physics from Serway. Where they say if a_r is radial acceleration and a_c is centripetal acceleration then a_c = v^2/r and a_r = -a_c = - v^2/r
But aren't the radial and centripetal acceleration same (correct me if I am wrong)? Why is there a minus sign?
The...
Firstly, do you agree that the (above stated) logical inconsistency of Aristotle shown by Galileo is sound? (Which is my original question.)
Secondly, I understand the importance of experiment in science. But if we can easily show that a theory is logically inconsistent then can't we stop and...
This question is from Resnick, Halliday, Krane; Physics 5th edition. This is not actually a homework problem rather a question and so I hope it's not inappropriate to post it here.
If m is a light stone and M is a heavy one, according to Aristotle M should fall fall faster than m. Galileo...
If universe is a thing, then it must stored somewhere - ie may be in a superior universe. So if you think like this, it wont end. Now if we think storage is endless, that may be a kind of thought, I agree. But it isnt clear enough. We need to have an idea of the last storage.
And surely the...
Take it a bit differently. A program is stored in a hardware. A hardware in a Computer. A computer in a room... house... city... country... earth... thus ultimately we reach to Universe. So everything is stored in the universe. What is universe? We can take a piece of wood and say, this is a...