Physics - February 2007

I try to aid my understanding of physics principles by figuring out appropiate analogies, or qualitatively picturing the 'what is going on' in an intuitive sense.

Obviously this isn't always possible; certain theories being notoriously unintuitive. But classical mechanics usually falls into the intuitive camp.

However, I'm having trouble gaining a 'what is actually happening' picture of the relationship between energy, force and speed. Now I understand the derivations of kinetic energy, the work-energy theorem, and power, etc - it's just the 'picture' I can't get.

As an example, I can't 'see' what is happening to the motive force as an engine revs faster. Assuming a constant power engine, as a car accelerates it's velocity increases and so the motive force decreases. However, I can't 'picture' why. I understand the maths and I can see why this is mathematically true. I just can't visualise why from a physical point of view.

Can anyone give a physical description of the decrease?

2007-02-28 00:42:39 · 4 answers · asked by Andy G 1

I need to submit these things tomorrow...so guyz plz help me...i hffta gt this project done anyhow.......
hope u'll help me
it's all about applications of daily life use of light and sound sensors...u just hffta tell abut their applications....
plus also smefin abut electric generation
hpe to gt the best answers within 12-13 hrs

2007-02-28 00:26:08 · 1 answers · asked by Anonymous

ok i have to translate this...

a boy stands on a scale and it shows 30 kg. The boy bends his knees and jumps off the scale. His friend see that the highest weight was 40 kg. What is the higest acceleration rate the boy gets in his jump?

2007-02-28 00:23:49 · 4 answers · asked by appelstina 1

A swimming pool filled with oil or syrup?

2007-02-28 00:22:09 · 4 answers · asked by Anonymous

is it because the agitated electrons somehow produce IR or something????

2007-02-28 00:21:59 · 6 answers · asked by lilmissy 2

How much water would have to evaportate from 64oz.of a 2% salt solution to make a 10% solution?

2007-02-28 00:12:24 · 2 answers · asked by RegularGuy 2

Which unit describes the difference in conduction between the wires?

A) amps (A)

B) ohms

C) volts (V)

D) kilograms (kg)

2007-02-28 00:05:04 · 6 answers · asked by Anonymous

2007-02-27 23:55:58 · 8 answers · asked by glenn r 1

Hypothetically, let's say I had a bar/stick made of a nonelastic material, which was long 300 000 km. Let's also say I was holding it at the end (well not me, some machine able to do that :) ) and pointing it in any direction (well, me, 'the machine' and the stick are somewhere in deep space).
IF I WERE TO PULL THE END I'M HOLDING TOWARDS ME, WILL THE OTHER END MOVE IN THE SAME MOMENT TOO !?
If yes, than there is some sort of energy that travelled faster than light.
If no, than that means the material was at one in time point longer than the original, which can't be, becose of the assumption it was a non elastic material. So if no, why?

It's a 'problem' I've been thinking on for quite a long time now and would appreciate serious and if possible scientifically grounded answers.

Thanks four your time.

2007-02-27 23:53:01 · 5 answers · asked by tomes12 2

2007-02-27 23:26:44 · 8 answers · asked by paddy g 1

2007-02-27 23:06:30 · 14 answers · asked by Karan A 1

2007-02-27 22:47:59 · 4 answers · asked by Sarah Mae A 1

2007-02-27 22:13:38 · 4 answers · asked by Anonymous

2007-02-27 22:13:08 · 2 answers · asked by Sarah Mae A 1

2007-02-27 22:13:04 · 1 answers · asked by Sarah Mae A 1

2007-02-27 21:54:54 · 3 answers · asked by Sarah Mae A 1

2007-02-27 21:53:36 · 5 answers · asked by Sarah Mae A 1

A) a proton pulling on an electron

B) an electron pushing on another electron

C) an electron pulling on a proton

D) a neutron pushing on another neutron

2007-02-27 21:44:53 · 6 answers · asked by max 1

Exposure to ultraviolet rays, x-rays, or gamma rays cannot be made perfectly safe. On the other hand, exposure to all lower-frequency Electromagnetic radiation can be made perfectly safe by limiting intensity. Please Explain.

2007-02-27 21:37:01 · 3 answers · asked by Anonymous

my friend said if we cant find it , it can it be used to prove our very existance is just a big lie like the matrix

2007-02-27 21:30:32 · 6 answers · asked by ben s 2

Can people help me as i have to find out about applications of radioisotopes in industry or medical etc, Thanks

2007-02-27 20:52:08 · 6 answers · asked by eSlide 2

2007-02-27 20:02:06 · 1 answers · asked by narayanamurthy m 1

when im trying to find the "distance" im not sure wheather i should be using "speed=distance/time" or the other "d=vi t + 1/2 at2?

2007-02-27 19:42:26 · 4 answers · asked by Anonymous

2007-02-27 19:15:45 · 6 answers · asked by bob i 1

details about design of space truss

2007-02-27 18:43:11 · 1 answers · asked by hari h 1

Describe the difference between monocrystals and polycrystals and the impact this difference has on X-ray and electron scattering.

2007-02-27 18:19:51 · 1 answers · asked by PhyzicsOfHockey 2

Discuss please.

2007-02-27 18:18:33 · 1 answers · asked by PhyzicsOfHockey 2

2007-02-27 17:58:13 · 4 answers · asked by popeye 1

I saw some fluids like rupper expands why but some other are not do same,

2007-02-27 17:45:50 · 1 answers · asked by ramesh_pon1976 1

2007-02-27 17:38:11 · 16 answers · asked by gopinath p 1