Physics - November 2007

If multi-walled carbon nanotubes (MWNTs) are generally metallic, why single-walled carbon nanotubes (SWNTs), which are partly semiconductors, are more electrically conductive?

2007-11-08 03:08:10 · 1 answers · asked by mm 1

I read some stuff about edible gold, and this one guy said if this special gold thing(Its molecules aren't bonded like normal gold? I totally forgot, but it was this special gold, and it was different) was heated just right? It would levitate and weigh less than nothing... I'm really into Science and stuff, but this seems weird... like that could only happen in zero gravity or something... Gas floats and it weighs very little, but more than zero. Sorry if this is worded weirdly, or if it's too long.

2007-11-08 02:38:11 · 7 answers · asked by I'm a morning person. 3

A 0.30-kg bullet is fired vertically at 200 m/s into a .15-kg baseball that is initially at rest. Please show work using the conservation of momentum and conservation of energy.

2007-11-08 01:58:42 · 1 answers · asked by chickenboy 1

the space between gas particles is ,uch less than the space between liquid or soild particles.

its volume in creases more under pressure than an equal volume of liquid does.

2007-11-08 01:43:25 · 2 answers · asked by Trey C 1

what are the affect of cold working on metals.

2007-11-08 01:25:35 · 5 answers · asked by Anonymous

A) First class postage, as a function of weight.
B) Atmospheric pressure, as a function of altitude.
C) Average daily temperature, as a function of the day of the year.
D) Earth's distance from the center of the sun, as a function of time.

2007-11-08 00:45:39 · 4 answers · asked by Anonymous

2007-11-08 00:44:48 · 6 answers · asked by La Flaca 4

introduction

2007-11-08 00:44:12 · 1 answers · asked by joerenco 1

This is about an imaginary universe in which the laws and properties of matter are equal to ours.

If you only have two objects in this universe, an observer who observes a round object spinning wildly. This second object is spinning about so quickly that any increase in its spin would cause it to lose coherence and break apart into small pieces.

If this situation had one change only, nothing else is changed in this scenario; namely, the observer is somehow removed from this universe so that only the spinning object remains left in this universe the following questions arise:

Does the object still spin? If yes what does it spin in relation to? How can you tell it is spinning?

If no, what happened to the energy that the spin clearly endowed the object with?

2007-11-08 00:39:10 · 3 answers · asked by Fuzzy 7

2007-11-08 00:16:00 · 10 answers · asked by kawaiime 1

The enthalpy of combustion of octane, C8H18, one of the major components of gasoline, is 5463 kJ/mole or 48 kJ/g. The density of octane is 0.70g/mL.

If your chemistry teacher's car requires approximately 10 L of octane in order to travel 100 km, how much energy does it require to travel 100 km?

2007-11-07 23:52:44 · 3 answers · asked by Anonymous

In physics we're doing an experiment on velocity (if you google 'experiment 36-velocity' and pick the 2nd result it will tell you. I know that decreasing the wind resistance caused by a card (needed to measure the velocity with a motion sensor), but can the mass of the car affect it's velocity? Please help!

2007-11-07 23:25:51 · 5 answers · asked by Anonymous

2007-11-07 23:24:18 · 3 answers · asked by kawaiime 1

how do i solve this??


Two charged balls are 20 cm apart. They are moved and the force on each of them is found to have been tripled. How far apart are they now?

2007-11-07 23:15:11 · 1 answers · asked by Anonymous

please answer only if you know for sure

2007-11-07 22:11:00 · 6 answers · asked by Anonymous

lyt energy

2007-11-07 22:06:28 · 3 answers · asked by sonny 1

My process, which was incorrect, is as follows:

Isphere = 2/5(14)(0.120)^2
= 0.0806 kg*m^2


L = (I)(Omega)
= (0.0806kg*m^2)(0.600rad/s)
= 0.0484 kg*m^2/s

I even tried using Isphere is m(s/2)^2, and that was incorrect. What am I doing wrong? Thanks!

2007-11-07 21:41:07 · 1 answers · asked by bouncing_soul_geuse 2

What happens to the kinetic energy of an object as it falls into a black hole?

2007-11-07 21:00:58 · 3 answers · asked by Nick D 2

A) What is its average angular velocity?
B) What is the tangential velocity of a point on the rim of the wheel?

2007-11-07 20:57:31 · 4 answers · asked by puno ng akasya 3

A capacitor balance has on one side a mass M, while on the other side is a capacitor whose two plates are separated by a be a gap of variable width. When the capacitor is charged to a voltage V, the attractive force between the plates balances the weight of the hanging mass. Calculate the voltage neccesary to balance a mass of 20mg if the plate area is 40 cm^2 & the plate separation d is 1 mm. can someone help me out..

2007-11-07 18:46:17 · 2 answers · asked by a.n. 1

A 0.141 kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.880 m/s . It has a head-on collision with a 0.290 kg glider that is moving to the left with a speed of 2.11 m/s. Suppose the collision is elastic.
A) find the magnitude of the final velocity of the 0.141 kg glider.

B) Find the magnitude of the final velocity of the 0.290 kg glider.

2007-11-07 18:25:02 · 1 answers · asked by lildrak2002 1

Question: A vertical spring (ignore its mass), whose spring constant is 900 N/m is attached to a table and is compressed 0.150m.
A) What speed can it give to a .300kg ball when released?
(Answer: 8.03 m/s)
B) how high above its original (compressed) position will the ball fly?
(Answer: 3.44 m)

I have the answers, I just need to find out how to get there.

My main question is how to find the velocity without knowing the distance it will fly, and vice versa. But I think my formula might be wrong, I've written:
SE (spring energy) = KE (kinetic energy) + U (potential energy)

I failed tremendously doing this, so I tried it without potential and got close to the right answer, but not exact, so I think i'm missing something. Help??

2007-11-07 18:15:36 · 3 answers · asked by Anonymous

At the intersection of Texas Avenue and University Drive, a yellow, subcompact car with mass 950 kg traveling east on University collides with a maroon pickup truck with mass 1900 kg that is traveling north on Texas and ran a red light . The two vehicles stick together as a result of the collision and, after the collision, the wreckage is sliding at 16.0 m/s in the direction 24 degrees east of north. The collision occurs during a heavy rainstorm; you can ignore friction forces between the vehicles and the wet road.

a)Calculate the speed of the car before the collision.
b)Calculate the speed of the truck before the collision.

i'm not sure how to do the problem if i have two variables and one equation.....please help....

this is the equation i got......
950 Vc +1900 Vt = 45600
where Vc=initial velovity of car
and Vt = initial velocity of truck

2007-11-07 18:09:29 · 1 answers · asked by sandymandy 1

A singly ionized 24Mg ion (mass: 3.983x10^kg) is accelerated through a 2.5kV potential difference & deflection in a magnetic field of 0.0557 T in a mass spectrometer.(A) Find the radius of curvature of the orbit for the ion. (B) What is the difference in radius for 26Mg ions and for 24Mg ions? (assume that their mass ratio is 26:24) OK SOMEONE HELP... and by chance does anyone know a good website to help with college physics?

2007-11-07 17:51:42 · 3 answers · asked by a.n. 1

2007-11-07 16:51:10 · 2 answers · asked by Debashree 1

Is it a "Grapenut?"

2007-11-07 16:44:14 · 8 answers · asked by Pull My Finger 7

OK I can't Spell it. But I still don't know what they are?
All I've heard is they can travel faster than the speed if light.
Were do they come from?
How do we know they exist?
Any help here?

2007-11-07 16:41:06 · 3 answers · asked by Paa Pop! 2

I cant really get the right answer for this question!

can someone plz answer this??

here is my question

Explain how the equation E=mc^2 is consistent with the Law of Conservation of Energy.

thx

2007-11-07 15:10:56 · 5 answers · asked by Anonymous

Which one of the following depends on the atmosphere exerting pressure?

(1) A ball falling to the ground
(2) Drinking through a straw
(3) The spray from a can cola
(4) Bath water emptying down a plug hole

The answer is (2) Drinking through a straw...I don't understand why that is the answer instead of the other 3 alternatives..Could anyone please explain the reason to me on why drinking through a straw depends on the atmosphere exerting pressure? Hopefully you could also explain to me what the other 3 options depends on (instead of them depending on the atmosphere exerting pressure). Thanks.

2007-11-07 15:01:28 · 3 answers · asked by ♪£yricảl♪ 4

Everything is made up of atoms. Compared to the size of an atom the space between the electrons, protons and neutrons are huge distances, which gives an atom a lot of space within its own physical structure. Each atom has space between it, as atoms do not touch each other no matter what the material they represent, be it water, a wall, or a rock.

Why, then, with so much space between atoms and space within atoms, am I unable to simply walk through a wall, or anything else, for that matter?

2007-11-07 14:53:58 · 4 answers · asked by Anonymous