Physics - September 2006

2006-09-10 04:28:58 · 23 answers · asked by x1gemma1x 1

2006-09-10 03:23:01 · 5 answers · asked by Julie K 1

H2SO4 (sulphuric acid) is often used as a dehydrating agent.Then why not H3PO4 and HNO3 ?????

In other words, why H2SO4 is a better dehydrating agent than H3PO4 and HNO3???

Lets see how many of u know the correct answer.The first one to give the correct answer will be chosen as the best answer and will be awarded 10 points.

2006-09-10 03:20:56 · 10 answers · asked by i_Abhishek 2

If alternate universes do exist and touch occasionally due to string theory are ghosts just images we are catching a glimpse of where they touch.

2006-09-10 02:36:11 · 23 answers · asked by lost my mojo 2

Ok, ever since I was a schoolboy, I always wondered what would happen if you:
1) Created a large hollow sphere made of that mirrored glass (the type you get on mirror-sunglasses) with the mirror surface on the INSIDE such that all the sunlight hitting it goes inside the ball and can't escape because it just bounces around inside.
2) Left the ball out in the sun for ages.
3) Smashed the ball.

Would all the light energy burst out in some all mighty explosion?

(Lets also assume the the glass has some highly non-heat conductive properties too).

Was I an Einstein-like child genius or just some kid without a proper grasp of the laws of thermo dynamics?! ;p

2006-09-10 02:26:07 · 13 answers · asked by ? 2

2006-09-10 02:13:21 · 2 answers · asked by Anonymous

Actual gas applying work outward in gravitational field
will be influenced by process
Bo miao
Shenzhen Sanyou
Abstract: the paper solved the distribute of density and pressure intensity in gravitational field ,and indicated the effect from microcosmic interacting to macroscopical thermodynamics , then base on that to research the actual gas in gravitational field : actual gas in two container with different tall , connected by two microtubule , if the capacity change (isothermal) ,gas will apply work .the magnitude will be influenced by the changing mode(process) of capacity .we can get the conclusion from the First law of thermodynamics ,the absorbing heat will be influenced by the changing process of capacity .
Keyword: The second law of thermodynamics, entropy, Green' s indentities, actual gas, Clausius equation

plz read pic as follow

http://bbs.tech.163.com/tech23/10366,0,50,0,40,0.html?userid=-0ZGV

2006-09-10 01:52:01 · 2 answers · asked by jaczbcmb 1

2006-09-10 01:19:30 · 6 answers · asked by Anonymous

I exactly want to know if it is possible to increase the volume of a metallic wire, only by increasing the length and keeping the cross sectional area constant. Is it not possible by applying an axial load ?

2006-09-10 01:15:58 · 12 answers · asked by Arun 1

The logic conflict of the second law of thermodynamics

The description of the second law of thermodynamics is that the thermal activity of an independent system always make entropy increase and make it maximum(stable balance)
There is some requirement for the subject of the second law of thermodynamics, which is independent system. While for the following independent system, there are problems when the second law of thermodynamics is applied. There are two cups A and B of water on the table. There are many floating charges. The outside doesn’t have any effect on them. So overall they can be viewed as independent system. From the second law of thermodynamics, the system should have a stable balanced state. From part like A, It is affected by B’s charges. So it cannot be viewed as independent system. And it is a big question whether it has a stable state or not. The same applies to B. Same subject and different conclusions show that the theory has disadvantage when applied to such subject.
Whether the system has stable state or not, should be determined by physical equations which should includes heat and electricity.
1 Poisson Equation
2 Boltzman Equation ρ=A*exp（qu/kT）
It is hard to solve the equations. They are not linear. From instinct, the probability of that they can be solved is very small.
It shows the second law of thermodynamics is only practical when there is not long-distance system. For example, there two internal combustion engines working in a classroom. The interaction between them is universal gravitation, which is too small and the effect of it can be negleted.
But the universal gravitation between celestial bodies cannot be negleted. It will also ruin the independence inside a system. Any galaxy is affected by other galaxies. So the second law of thermodynamics is not suitable anymore. Theory of heat death of cosmos is practically meaningless.
The above is obstacle of language and logic. The following two parts of discussion is on problems of calculation.

2006-09-10 01:09:03 · 1 answers · asked by jaczbcmb 1

2006-09-10 01:04:49 · 15 answers · asked by Anonymous

The equation H=G+ST is not correct under the condition of remote-interaction system.
miao bo
The second law of thermodynamics shows that there is some constraint condition in the process of heat energy’s transform into function, which is that heat energy can be divide into two parts: the ordered energy ( can be transformed into function) and disordered energy( can’t be transformed into function).
This is H=G+ST
Suppose a system whose different parts have different temperature, which is the common analysis by physics who often divide the system into many little parts and each parts’ temperature is think as the same, then the above formulation can be rewritten as the following.
h=g+s*T
Using g and s is very common in the advanced theory of thermodynamics. Even if the temperature is the same everywhere, using the equation h=g+s*T, is more correct, because it maintain the continuity of physical law.
Now let us image an object with electricity and each parts are interacted with others by the remote electromagnetic, it is natural that electromagnetic energy doesn’t belongs to any local part. In this system, we can’t divide it into many parts, but the temperature has the local part’s characteristic. So the formulation h=g+s*T can’t be applied. This has essentially broken the world of ordered energy and disordered energy.

2006-09-10 00:54:40 · 2 answers · asked by jaczbcmb 1

2006-09-09 23:58:14 · 5 answers · asked by Anonymous

2006-09-09 23:54:38 · 8 answers · asked by bully1966 1

Is it not true that antonym of Black Hole exhibits similiar optical/visual illusions?

2006-09-09 23:36:08 · 13 answers · asked by orsel 2

2006-09-09 23:35:58 · 3 answers · asked by darwin 2

2006-09-09 23:27:43 · 13 answers · asked by nithesh s 1

2006-09-09 23:18:36 · 7 answers · asked by vijayshanku 1

2006-09-09 23:02:07 · 8 answers · asked by mcimpotent 3

2006-09-09 22:32:48 · 8 answers · asked by amirlanaa 1

they both have heating elements right?
do they make use of conduction and convection?
does the water heater make use of hydraulic systems???

f.y.i, by water heater i mean the one you use to boil your drinking water, not the bathing one...

please answer seriously and coherently! thanks:)
the first helpful answer gets 10 points!!

2006-09-09 22:00:43 · 9 answers · asked by saffy 2

yeah i know what it is. "Energy can be converted from one form to another, but it cannot be created nor destroyed."
But what I need to know is, how on earth does it apply to the conversion of electrical energy to heat energy??
Serious answers please.
This is urgent.

2006-09-09 20:53:48 · 4 answers · asked by saffy 2

2006-09-09 19:57:33 · 7 answers · asked by newsgirlinos2 5

I can't think of anything else more all consuming. Is there anything else? It's for a report, so anything else would help.

2006-09-09 19:51:59 · 7 answers · asked by Anonymous

2006-09-09 18:41:57 · 3 answers · asked by Anonymous

2006-09-09 18:33:57 · 19 answers · asked by suseendar 1

2006-09-09 16:47:54 · 15 answers · asked by NAVIN 1

2006-09-09 16:41:45 · 12 answers · asked by Arun 1

2006-09-09 16:14:35 · 14 answers · asked by greg w 1

Does anybody have any interesting topics??

2006-09-09 16:04:54 · 3 answers · asked by Anonymous