Physics - June 2007

can be it used only in physics termsnology or can be use in our daily life

2007-06-24 17:52:44 · 2 answers · asked by neha g 1

measurement using platform balance and spring balance

2007-06-24 17:34:28 · 1 answers · asked by fritz 1

A car is accelerating while its horn is blowing. Just after the car passes a stationary person, the person hears a frequency of 971 Hz. 19.9 seconds later, the frequency heard by the person has decreased to 914 Hz. When the car is stationary, its horn emits a sound whose frequency is 1020 Hz. The speed of sound is 343 m/s. What is the acceleration of the car? Assume that the velocity of the car is always in the positive direction.

2007-06-24 16:47:03 · 2 answers · asked by Anonymous

but not the other. explain plz???

2007-06-24 16:41:35 · 2 answers · asked by zubair y 1

b) why is it wrong to think of heat as a form of stored energy?

2007-06-24 16:33:28 · 5 answers · asked by zubair y 1

Explain where the energy is coming from?

2007-06-24 16:29:29 · 11 answers · asked by zubair y 1

I never took a physics class and was wondering which impact would cause more damage (to a vehicle and to the human body).
Scenario 1: two vehicles traveling 70mph towards each other and hit head on.
Scenario 2: one vehicle traveling 140mph hitting a completely stationary object (like a concrete column that supports an overpass).
If you could break it down mathematically, that would be fantastic! Thank you

2007-06-24 16:27:25 · 7 answers · asked by hotmom_e 2

help me to solve this?

2007-06-24 16:26:18 · 4 answers · asked by zubair y 1

I know that theoretically nothing can travel at the speed of light. The closer you get to the speed of the light the more your mass increases, hinting that if you could reach the speed of light your mass would be infinite. I think there's also something about time slowing down. What I want to know though, is why do scientists think this? What's so special about this certain speed that renders it unattainable? And why do all these "special" things start to happen when you travel extremely fast? Why is the speed of light different than any other speed, in regards to us being able to go that fast?

2007-06-24 15:43:35 · 12 answers · asked by mike 1

I'm going to major in physics next yr in university. so I've been thinking about work and energy and trying to really understand it ..but now I'm confusing the hell out of myself lol with conservative and non conservative forces and work,etc

For ex. I was thinking about gravity technically doing negative work on an object when you push it up and then the applied force doing positive ..and then when you let it go ..gravity does positive work and ..yea..confused..

then I was thinking about spring forces, electric forces etc ..friction

Can someone just help me look at these problems in a unified way .should I always just add the Potential and kinetic energy + work = Etf or Should I just add the potential energy + work done by a conservative force + work done by applied force. ..
um ..........


HELP!!!!!!!!

2007-06-24 14:42:28 · 2 answers · asked by Anonymous

I like scientific evidence but some claims seem to fall short.

2007-06-24 13:47:32 · 9 answers · asked by james h 2

As steel cube 0.30 m on each side is suspended from a scale (that measure's weight in Newtons) and completely immersed in water. What will the scale read?

Note: the density of steel 7800 kg/m^3

2007-06-24 13:19:45 · 1 answers · asked by Concerned 1

2007-06-24 13:14:08 · 7 answers · asked by Heather G 2

v1=10 m/s
a = 5 ms2
t = 3s
v2 = ?
v2 = v1+ a A t
=10 m/s + (5 m/s2) ( 3 )
= 10m/s + 15 m/s
= 25m/s
' the capital A stands for the triangle '
a calculation to determine a car's final speed after accelerating for 3 sec .
what would be the speed have been after 3 seconds ? my answer was 25 m/s
not sure if it is calculated in the right equasion ? the other choices 20m/s 30m/s 35m/s

2007-06-24 12:23:36 · 4 answers · asked by treasure 2

Like when u suck your voice gets squeaky, and i heard that if it goes through a different way, u can die.

2007-06-24 11:10:15 · 9 answers · asked by bbycakes 2

And is it possible to buy empty ones that you can fill with whatever you want, or even make one yourself? Thanks!

2007-06-24 10:58:41 · 5 answers · asked by Gregory 1

Sirius Bs' calculated average density is 92,000 times that of Sol's, so that one cubic inch of its material would weigh about 15 tons at the surface of the Earth. How can we know this? What are the odds that it is wrong? I assume we base the equations plugging Sols density and mass vs density and mass of the star we are studying. But how can we be sure these type of metals exist?

2007-06-24 10:02:45 · 5 answers · asked by bacardi and diet 2

I used to own a car which, I guess, had a dodgy aerial connection, the radio would go very quiet, I'd tap the radio fascia and it would go loud again.

My question is, though, it would also come loud again if I drove under National Grid electricity wires. Anyone got any ideas how that could happen?

2007-06-24 09:48:36 · 5 answers · asked by funkysi65a 3

We see the colour black because it is all the other pigments mixed together, and small parts of those other pigments show up to our eyes. But if something was entirely black wouldn't it be like seeing a black hole, i.e not being able to see the object but rather a loss of any object in the space it takes up, or also a bending of light instead. Or would you just see it like all other 'black' objects in our world. I personally think you would see it as you would see a black hole, a lack of anything rather than seeing something. But i'm curious about what other people think and i could also be persuaded to think otherwise :). Have fun answering

2007-06-24 09:45:07 · 13 answers · asked by Anonymous

I been wonderin 4 awhile

2007-06-24 08:36:15 · 11 answers · asked by Anonymous

-How would this have effected evolution on Earth?

-Would it have allowed for complex life forms to evolve on Mars?

-How would it have effected the other planets in our solar syatem (Excluding Jupiter)?

2007-06-24 08:15:52 · 4 answers · asked by Qweemawva Anzorla Qwartoon (Male) 3

That is, could I stack two 12V DC adapters and get 24V DC?

2007-06-24 07:57:03 · 4 answers · asked by supastremph 6

I heard that they were less, but I don't know why that would be.

2007-06-24 07:48:50 · 9 answers · asked by Anonymous

please give precise answers

2007-06-24 07:26:11 · 12 answers · asked by Satwik P 1

As it says at
http://answers.yahoo.com/question/index;_ylt=AiCLAEHCFHyR.YIoRV1PvFPsy6IX?qid=20070520173937AAQfRBc
, there's no method known to gain deeply relativistic speeds and brake again.
I assume 'deeply relativistic speeds' includes 99.99% of lightspeed. That book was written in 1989.

The question is: is there in 2007 still no known feasable theoretical method to travel at 'deeply relativistic speeds' (including braking on time)?

And: can fatal damage by micrometeoroids be feasable avoided at such high speeds?

2007-06-24 07:20:32 · 4 answers · asked by · 5

What really happens if you were in a lift that is falling and you jump just as it hits the bottom? A scientific answer would be great thanks!

2007-06-24 07:07:19 · 10 answers · asked by Equal Animal 5

2007-06-24 06:59:12 · 7 answers · asked by Satwik P 1

2007-06-24 06:21:47 · 10 answers · asked by Satwik P 1

please give me clear & detail ans.that is easy to undrestand

2007-06-24 06:15:31 · 5 answers · asked by Anonymous

Air pilots always take their airplane way up high in the sky over the clouds. Wouldn't it make the distance longer since they would be circleing the earth at a further distance from the surface?

2007-06-24 05:54:21 · 6 answers · asked by Derek 3