Physics - July 2007

if so could u give me an example. if u cant it dont matter.

2007-07-14 06:42:17 · 10 answers · asked by lola ze 1

Sweet! I just made it to Level Three. Now my only problem is becoming a Top Contributor. I have 30% best answers, and most are in Physics...how do I become a TC?!

2007-07-14 06:19:49 · 8 answers · asked by Anonymous

Remember that light is not solid matter; it's energy. This is why it travels at 186,000 miles per SECOND. Besides that, it has no weight. Solid matter has mass and weight. Please give your research along with your answer.

2007-07-14 06:13:53 · 8 answers · asked by noblefairlonghairedleapinggnome 2

I have heard that using diamagnetic forces and rare earth magnets I can make things or magnets levitate. I have the rare eath (neomydium) magnets. What are some houshold items that I can use to make somthing hover (whether it be a magnet or an object). Really want to levitate somthing. Help Please. P.S. I know that this question is vague and not very well asked, but Please, I need answers.

2007-07-14 05:42:10 · 2 answers · asked by John S 1

When you mix up a cup of cappuchino (say), and begin stirring it round and round, the spoon makes noises as it scrapes around the bottom of the cup. Or a milky drink, ...-whatever.

But as the rotational velocity of the liquid increases, the pitch of the stirring-noises decreases as if a Doppler effect were taking place. Why? The ears hear both receding and approaching wave-fronts simultaneously.....

And as you cease stirring, or stir more slowly, the pitch rises again, and falls again as you stir faster again. You can repeat it over and over... it seems to have something to do with the density and viscosity of the liquid, and its rotational energy, but I can't understand the phenomenon.....
Can you?

2007-07-14 04:36:10 · 4 answers · asked by Luke Skywalker 6

Ever since I took basic physics and learned about the Right Hand rule for Torque, I could never figure out why would this rule is the way it is. I mean, if you are facing a wheel and turn it counter-clockwise, why does it always direct (point) towards but not away? I would really love to read about why this is, because I've researched briefly on some search engines and most of them just explained torque as change in direction and its equation formulas. So far, it just seemed like the creater for the law of physics for this universe just "picked" a direction to point when you rotate things...

2007-07-14 04:17:07 · 9 answers · asked by Kc_1114 1

Modern kettles with elements below the base start very noisy and reduces till boiling.
Older designs with a culy element in the water get noiser till boiling point.

2007-07-14 02:53:11 · 5 answers · asked by Anonymous

While I have some notion of what Entropy is qualitatively reading around, but I have no idea why dS = dQ / T exactly. Specifically why you divide by T. That is, why Entropy is exactly inversely proportional to temperature.

Is this just an arbitrary definition? or does it actually predict some some phenomenas. If so, what quantitative scientific observation does it predict?

2007-07-13 21:23:05 · 7 answers · asked by lainwired 1

lets say the size of Manhattan. it stays in place but I guess it can move to. go I guess like huge boat island. moving slow.

2007-07-13 20:40:57 · 8 answers · asked by Anonymous

What is the spesific heat at constant pressure (Cp) of soap with 40% moisture at 2 bar pressure?

2007-07-13 19:38:16 · 1 answers · asked by aw_pw 1

What are the spesific heat at constant pressure and spesific heat at constant volume of pure soap? How it varies with moisture content and pressure?

2007-07-13 19:35:01 · 1 answers · asked by aw_pw 1

2007-07-13 18:57:18 · 5 answers · asked by fatandsmooth 5

2007-07-13 18:54:16 · 2 answers · asked by Anonymous

its the square with all different colors. you twist and turn it until all of the colors are together?

2007-07-13 18:06:09 · 6 answers · asked by allie 4

Two wires made of the same material are stretched by equal forces. The second wire is twice as long as the first one and also has twice the diameter of the first wire.
If the first wire is stretched by delta L (angular momentum)= 3.6 cm, then by how long is the second wire stretched?

2007-07-13 17:53:41 · 1 answers · asked by Doodle 2

Why is it, only under cold weather conditions to you have to rub a fluorescent bulb, perhaps with a moist cloth for it to become lit; whereas in warm conditions they light as soon as you turn on the switch? I think it has something to do with the flow of charges.

2007-07-13 16:52:41 · 2 answers · asked by Anonymous

2007-07-13 16:17:10 · 2 answers · asked by Cleveo7 1

Give an example?

2007-07-13 14:42:28 · 6 answers · asked by Gypsy Gal 6

I'm having trouble solving this question, any help would be appreciated:

a) Two parallel plates having charges of equal magnitude but opposite sign are separated by 10.1 cm. Each plate has a surface charge density of 39.9 nC/ m2. A proton is released from rest at the positive plate. Determine the potential difference between the plates.
b) What is the energy of the proton when it reaches the negative plate.
c) What is the speed of the proton just before it strikes the negative plate.

If you someone could give me a step by step of how to solve this I'd really apprecaite it.

Thanks

2007-07-13 14:39:06 · 3 answers · asked by rolo_cakes 2

A 20kg object was dragged along a 5 meter distance.The force exerted was 50 N
a.how much work is done?
b.how much work is needed to lift the object 5 m.?
c.compare the work done in both cases.

2007-07-13 14:20:28 · 1 answers · asked by Boxster 2

Although I know very little regarding physics, I feel it could be very useful at this point in my life. Recently someone close to me passed on, but a family member who is physic has had a preminition that the close friend had bought a winning lotto ticket & we need to contact them to let us know where they put it?

2007-07-13 10:49:11 · 10 answers · asked by Anonymous

earth is zero charge ,,but this should has some limit?

2007-07-13 10:12:20 · 7 answers · asked by osama I 2

I've been reading the book of Urantia, which says that God lives in the Isle of paradise and that this is the central gravity point of the universe, yet it exists outside of space-time. How in the name of hell is that possible??

2007-07-13 10:03:58 · 9 answers · asked by CSkyways 2

2007-07-13 10:00:40 · 5 answers · asked by Alexander 6

1. During respiration, o2 combines with co2 and also releases energy in the form of heat. Where does this heat come from? Does it leave co2 cold? But we breath out warm co2.

2.Why do gas molecules of the same element not become solid under a little pressure? Why do they get away from each other?

3. Why do the gases stay afloat? why don't they fall on ground? Why do light gases rise up despite the presence of gravity?

2007-07-13 09:12:08 · 5 answers · asked by mint 2

The potential energy is taken to be zero for an electron at an infinite distance 4rm d nucleus.
n=4 ---------------------------- -2eV
n=3 ---------------------------- -5eV

n=2 ----------------------------- -10eV


n=1 ------------------------------ -20eV

Part A -
How much energy (in eV) does it take to ionize an electron from the ground level?
Part B -
An 18.0 eV photon is absorbed by a searsium atom in its ground level. As the atom returns to its ground level, what possible energies can the emitted photons have? Assume that there can be transitions between all pairs of levels.
Part C -
What will happen if a photon with an energy of 8.00eV} strikes a searsium atom in its ground level? Why?
Part D -
Photons emitted in the searsium transitions n=3→n=2 and n=3→ n=1 will eject photoelectrons from an unknown metal, but the photon emitted from the transition {n=4 →n= 3} will not. What are d limits (max and min possible values) of d work function of d metal.
Ǿ_min & Ǿ_max=

2007-07-13 08:51:06 · 2 answers · asked by Anonymous

I'm so confused in physics...any other advice?

2007-07-13 08:50:52 · 6 answers · asked by rick m 1

(Taken from Cengel's book)
Would it be feasible to try to cool a house by compressing air, letting its temperature go down, using the compressed air to power a turbine and then discharging the cold air into the house?

2007-07-13 07:58:26 · 3 answers · asked by Nico 2

storm

It did not last twenty minutes
and in that twenty minutes
a lifetime begins
in the condensed turmoil and trauma
of a chaotic summer storm
what I hear is electric and my arms ache
the walls are washed clean
left wet and smooth
in an hour they will be
shrivelling and drying in the still
shrill emptiness of a vacant room
thunder bellows
grumbles and echos
angry with the the sea perhaps
or me
the sea shifts and swells into great breakers
they form and foam and surge
rush to shore crash and splinter
they are like great grey whales breaching
turning falling back
grey on grey on grey
the sky is indiscernible
It is a world of wet
water rain
I redistribute my weight
and stretch for a better look
of the lightening ahead
the sheet of brilliant day
illuminates the air
I see a shadow, feel
a darker grey in the distance
is it the palms bending?
and more rain condensed there
and
beyond there the thunder recedes
hurries back
to shatter the possibility of silence
calmly life that old life, ancient electric life
waits with me behind the curtain
of the turbulent morning
slowly the voyage over
and the storm subsides
stops like a train entering a station
a bird calls
the sky clears
the lamps of daylight glow
the palms stand still and tall
resting
from their dance with the wet momentum
of wave and wild water
I am wrapped in the arid air and blinding light
and held
the bird calls again
and I drier now answer and suckle.

2007-07-13 07:35:07 · 6 answers · asked by pat 4

2007-07-13 07:29:27 · 7 answers · asked by Joe 2