Physics - January 2007

there is no reason why it can't be a differnt shape. i'm not saying that it has to be a triangle....but why a ball shape. ya know, and please i don't want some dumb 4 page answer. nothing off the internet that is crap

2007-01-17 02:56:07 · 6 answers · asked by hkirishmen 1

What are those ball shape objects on the high tension (voltage) cables , we usually see and what is their function?

2007-01-17 02:50:36 · 3 answers · asked by herosam2002 3

1)What is the average speed of an MRT train if it takes 30 minutes to travel 30 km from North Edsa to Pasay Taft station?
they said the answer is 60 km/h

2) A car starts from rest and is uniformly accelerated to a speed of 30 m/s in 6 s. What distance does the car travel?
they said the answer is 90 m

My answer in #1 is 1 km/h but they said its wrong and my answer in #2 is 5 m but they said its wrong..
please show me why did they say that the answer in #1 is 60 km/h and the answer in #2 is 90 m.

why?? how it became the answer is 60 km/h and 90 m????
a.s.a.p

2007-01-17 02:33:37 · 5 answers · asked by Anonymous

2007-01-17 02:13:49 · 9 answers · asked by Mandar 2

in fact i need something which happens when a hot object and a cold object meet....its an invisible thing

2007-01-17 02:02:31 · 3 answers · asked by mukunth 2

we know that as we provide heat (infra red radiations) to any thing light begins to emit from it.first appears red followed by orange n yellow i.e. as we increase the temperature the wavelength of visible light emitted from it decreases.
we are told that the highest temperature in a candle flame is at the tip so how is it so that the core of the candle is blue(of lower wavelength) and the tip red
if i am anywhere wrong in my concept i m sorry for it
please explain this phenomenon to me if u cud

2007-01-17 01:57:54 · 6 answers · asked by pukku 2

Set as children's homework for Key Stage 2

2007-01-17 01:51:34 · 5 answers · asked by florenceflossie 1

Suppose that during the whole journey there is a constant wind blowing from A to B. If the speed of the aircraft in still air is 165 km/h, find the speed of the wind.

2007-01-17 01:46:54 · 5 answers · asked by Zin Mar 1

2007-01-17 01:29:37 · 4 answers · asked by Your Maker 3

2007-01-17 01:09:59 · 13 answers · asked by Muhammad Isamuddin Pardo - 1

2007-01-17 00:43:39 · 11 answers · asked by Mandar 2

Does gravity affect speed of light? - from - 29 answer(s)
What is the fuction of gravity?does all the objects react to gravity... - from - 6 answer(s)
Why does gravity exists?????????? - from - 21 answer(s)
What is the fuction of gravity?does all the objects react to gravity... - from - 5 answer(s)
What does petrol's specific gravity have to do with mileage and performance

2007-01-17 00:42:39 · 20 answers · asked by Rithik(rohit) a 1

I read on a bbc website that a guy has produced an invisibilty cloak. Sounds handy, does anyone know where i might be able to get my hands on one? (I'd imagine they'd be quite easy to lose)

2007-01-17 00:35:31 · 12 answers · asked by Juz 2

2007-01-17 00:16:04 · 4 answers · asked by Anonymous

my college professor asked this question, and i wasn't able to find it anywhere....
please specify any books or websites that you may know.
thanx.

2007-01-17 00:01:08 · 2 answers · asked by Rohit 1

2007-01-16 23:11:05 · 14 answers · asked by aww lovee 2

i just need the conclusion. please help:D

2007-01-16 23:02:55 · 1 answers · asked by maymay 1

I have seen footage of the shockwaves that nuclear bombs produce as i am sure you will have. I often wonder how the footage was shot as everything seems to get practically wiped-out eg. small buildings, trucks

2007-01-16 22:58:25 · 3 answers · asked by fartermacdaddy 1

A structural I steal beam has a density of 7.56 x 10^3 kg/m^3.

What is the mass of a section 1.50 m long?

And it shows a figure of an I beam, the top is 15 cm long, the side is 36 cm long, the widths of the 3 parts of the I are 1.cm wide.

so m=pV, I know the density, but how do I figure out the volume?

Somethin to do with Area times height, but I'm not gettin it right....

I got .54m^3 as the volume and that's wrong.....

2007-01-16 22:56:08 · 2 answers · asked by Anonymous

maybe with some math ?
i already read hawkings universe in a nutshell, Feynmans QED and a bulkload of ...uhmm...'doubtful other stuff'. now i search for some quality description about string theory

2007-01-16 22:35:01 · 3 answers · asked by blondnirvana 5

i lately found some good description about how to imagine dimensions .. checkout this

http://www.tenthdimension.com/flash2.php

now it came to my mind.. could momentum be the result of a kind of restriction to move freely in a higher dimension ?

Any input on this welcome..
as usual i think about this question as a testbed to get alternate ideas on things .. hopefully its not too esoteric ;)
thank you

2007-01-16 22:31:51 · 3 answers · asked by blondnirvana 5

Can science explain 'free will' - or is it just an illusion?
Could it be that everything that's ever happened was decided at the 'big bang'? like one big science experiment full of pre-determined chain reactions?

2007-01-16 22:26:30 · 3 answers · asked by FH 1 1

on the basis of saturation vapour pressure

2007-01-16 22:10:31 · 4 answers · asked by Anonymous

2007-01-16 21:57:41 · 2 answers · asked by pavan kumar NC 2

2007-01-16 21:17:22 · 3 answers · asked by Kris 1

And how will this be changed by things such as air friction, etc. Will the heavier object fall faster? Even though it has the exact same surface area as the lighter object?

2007-01-16 21:07:07 · 5 answers · asked by Oridina 2

If a charge glass rod is held near one end of an insulated uncharged metal rod, electrons are drawn to one end. Why does the flow of electrons cease? After all, there is an almost inexhaustible supply of them in the metal rod.

2007-01-16 20:08:52 · 1 answers · asked by noob 1

Is it a mixture or pure substance? mixture - 2 or more substances that are mixed together but not chemically combined. pure substance- made of only one kind of matter and has definite properties (pure substances consiste of compounds and elements) -compounds are pure substances formed from chemical combinations of two or more different elements. -elements are pure substances that can't be broken down into other substances by any chemical means.

2007-01-16 19:39:28 · 5 answers · asked by ♥ hey! 2

Suppose you have displayed a sine wave with V = Vosin(wt) on the screen, where Vo=5V and 2=5kHz. Assume further that the signal triggers the scope when V=2.5V and wt=30.

EXAMPLE:
Suppose you double the amplitude of the wave without changing any oscilloscope settings. What are V and wt now when the scope is triggered? [Answer: the level hasn't changed so the scope still triggers when V=2.5V. V=2.5=10sin(wt); wt=sin^–1(2.5/10)=14.4775121851511.]

QUESTION:
Assume that you reduce Vo back to 5 V and switch the trigger slope polarity from '+' to '-' without changing the trigger level dial. What are V and wt when the scope is triggered now?

2007-01-16 19:14:14 · 3 answers · asked by Anonymous

Why might strobe frequencies lower than the frequency of vibration of the rope appear to "freeze" it? What frequencies would do this?

2007-01-16 19:02:59 · 4 answers · asked by summer6_85 1