Physics - March 2007

science tells us that energy can only be transformed from one form to the other... mechanical into electrical, electrical into light etc...

but if energy can never be created, how did it originate ? it couldn't have been always there without being born!

what am i missing ?

2007-03-12 03:43:47 · 5 answers · asked by x 2

connected by a string which passes over a frictionless pulley to a second block of mass 2 kg which hangs vertically from the string. In the above problem suppose that a downward force of 5 N is applied to the 1 kg mass. The acceleration of the two blocks is

2007-03-12 03:43:43 · 5 answers · asked by kina040386 1

I have to write a two page paper(nothing major) on a physics topic of my choice but I don't know what to choose that will give me two pages worth of information. Please advise

2007-03-12 03:42:18 · 4 answers · asked by laquay723 1

if you fill a plastic tray with water. When frozen, under certain conditions, a bulge will appear on the surface.what's the phenomenon?

2007-03-12 03:42:14 · 2 answers · asked by Myself 1

...what it the force of gravity?
i need it for a conclusion.

2007-03-12 03:34:53 · 4 answers · asked by Anonymous

Can anyone briefly explain the concept of negative energy? How can anything have less than nothing regarding energy? Thanks for any answers in advance.

2007-03-12 03:29:37 · 6 answers · asked by Anonymous

bottom block and the two blocks move together at constant velocity. The coefficient of kinetic friction between all of the surfaces is 0.2. The force F has magnitude

2007-03-12 03:22:38 · 2 answers · asked by sakinah_123 1

A physics student standing on the edge of a cliff throws a stone vertically downward with an initial speed of 10.0 m/s. The instant before the stone hits the ground below, it is traveling at a speed of 30.0 m/s. If the physics student were to throw the rock horizontally outward from the cliff instead, with the same initial speed of 10.0 m/s, what is the magnitude of the velocity of the stone just before it hits the ground?

2007-03-12 03:11:06 · 2 answers · asked by Pamela T 1

If we are considering one atom,it has discrete energy levels.If we are considering a crystal or a molecule comprising of more than one atom ,it has energy bands.
How and for what purpose the trasfer from discrete energy level to energy bands occures?Why in molecule,it can't be like energy levels?
consider Si crystal..it is coposed of identical Si atoms..having identical energyl evels..but when they form the crystal,we are getting a range of energy ..not discrete..even though no two electron can occupy all the four quantumstates the same(pauli's exclusion principle)..,is it not possible to be like discrete energy levels..?

2007-03-12 03:07:54 · 0 answers · asked by Bipin mzr 1

please explain. thanks

2007-03-12 03:05:31 · 2 answers · asked by kuwee 2

2007-03-12 02:56:12 · 9 answers · asked by robbob 5

i need to know magnitude and coffiecent of kinetic friciton

2007-03-12 02:53:01 · 1 answers · asked by Pamela T 1

2007-03-12 02:41:35 · 1 answers · asked by Pamela T 1

Why cant it be yellow?

2007-03-12 02:35:41 · 15 answers · asked by Sarah-Lynne G 2

2007-03-12 02:31:15 · 4 answers · asked by santhosh k 1

2007-03-12 02:30:45 · 3 answers · asked by santhosh k 1

please give me a site that haves the olimpiad(physics ) problems not IPHO or if you coud send some to my e-mail adress
to the best problems ( better to be from the western) is the best answer
thanks

2007-03-12 02:29:56 · 1 answers · asked by 1145 2

What is their closing speed?

2007-03-12 01:24:08 · 10 answers · asked by kicking_back 5

2007-03-12 01:15:39 · 14 answers · asked by Sunnychayan 1

Ok, So If I am sat on a plane, which is travelling at 500mph, am I travelling at 500mph too? Even though theoretically I'm not moving?
Secondly, If I walk towards the front of the plane at let's say 1mph, am I travelling at 1mph, 501mph or 500mph?
Finally, If I walk towards the rear of the plane at 1mph again, am I travelling at 1mph, 499mph or still at 500mph?

2007-03-12 00:24:53 · 25 answers · asked by kaiah03 2

2007-03-12 00:04:51 · 3 answers · asked by mhay_sweet-cudlie 1

2007-03-11 23:51:03 · 6 answers · asked by aartsey 1

I know the basics of refraction, but I'd like to extend/advance my report by going into depth about it, perhaps relating it to some interesting phenomena, and connect it to more complicated physics theories.
Can you suggest some things?

2007-03-11 23:14:34 · 3 answers · asked by Anonymous

The gravity force between us and objects around us is extremely small as gravity is a weak force. The electric force is far more powerful than the force of gravity. Since we and the objects around us are composed of charged particles, why don't we feel strong electrical forces?

2007-03-11 21:44:20 · 4 answers · asked by Anonymous

this is made of ferroelectric materials

2007-03-11 21:42:54 · 3 answers · asked by swathi 1

This is made of using ferroelectric materials

2007-03-11 21:39:41 · 3 answers · asked by swathi 1

explain with an example.in which mass,energy remains constant?while deriving reynolds transport theorm we consider CV remains constant,moving and deforming.. i heard CV is fixed always .is it true?

2007-03-11 21:34:59 · 2 answers · asked by naga 1

Name 6, and its enough. Please help!

2007-03-11 21:06:14 · 1 answers · asked by JayFromSingapore 1

This is a rephrasing of a question I asked earlier with good answers but none that satisfied me.

Right, you are in a spacecraft and you are looking back at your twin on earth with a very large telescope.

Then you travel away from earth at 99% the speed of light. For a few years then come back.

According to relativity you will be younger than your twin. But while you are looking through the telescope you must at some point see your twin aging faster than you, therefore time speed up.

But everybody is telling me both twins are observing each other with time slowed down and I do not understand how.

Please help me.

2007-03-11 19:37:35 · 4 answers · asked by Anonymous

2007-03-11 19:18:33 · 14 answers · asked by SWETA 2