Physics - March 2007

websites containing information on silicon would be greatly appreciated if provided

2007-03-10 20:08:22 · 10 answers · asked by danny s 1

Einstein did not believe time travel was possible but his neighbour Kurt Godel found a solution proving time travel is possible, This actually embarrassed Einstein.

What exactly and how did Kurt manipulate Einsteins equations to prove this?

2007-03-10 19:08:23 · 3 answers · asked by sh 1

please help me to make a powerpoint about color

2007-03-10 19:02:50 · 4 answers · asked by Anonymous

2007-03-10 18:37:48 · 6 answers · asked by joey8421 1

i want to know the correct definition for mass in basis of neuclear reaction in losing mass into energy?

2007-03-10 18:30:28 · 4 answers · asked by CRAZY NEIRD 1

2007-03-10 18:10:19 · 10 answers · asked by Anonymous

measured along the surface of the water, a rectangular swimming pool has a length of 15 m. along this length, the flat bottom of the pool slopes down at an angle of 11 degrees below the horizontal, from one end to the other. by how much does the pressure at the bottom of the deep end exceed the pressure at the bottom of the shallow end?

2007-03-10 17:23:45 · 1 answers · asked by tico 1

everyone says g=0 but i say NO
because ,
by universal law of gravitation,

g=G Mm\R*R
WHERE,G is universal gravitational constant
M IS MASS OF EARTH
m is mass of a body say "a"
R is radius of earth
since G and M are constant,
so g is inversely proportional to R*R
but R=0 at the centre of earth ,
so g cannot be 0
please tell me whether i am correct

2007-03-10 17:19:52 · 14 answers · asked by ANU 1

I believe 45 degree but when I did experiement it yielded best at ~35 degree.

2007-03-10 16:30:33 · 8 answers · asked by Kids Science Fun 2

Is there a way to measure or calculate the resonance frequency of an object?

2007-03-10 16:21:16 · 2 answers · asked by misoma5 7

I have a series circuit ( 9VDC + 2 resistors [ 100 ohm + 220 ohm])

1. When testing the battery is it common practice to test its voltage under full load only?
I ask because when i tested the battery I was getting a reading of 9.61 so then I decided to test it with the circuit powered up and it was closer to what it should be at 9.02 volts.

2. My voltage drops do not add up to my Source Voltage ( under load), they differ by .41 volts. I am thinking this should be acceptable because the formulas should be used as a guideline and not a strict rule.
I am thinking anything under .8 would be good.
I am also thinking, the formulas are only if all things were perfect what the results would be, but since nothing is perfect there will (most of the time) be a difference.

How much of a difference should I allow before thinking there is a problem?

Should i even bother calculating the formula or just take the actual readings and go by them - Real World Standards?.

2007-03-10 16:02:14 · 7 answers · asked by Anonymous

I am taking a college level physics class and we were giving a project and I am very lost, could someone please help me? Best answer will be chosen!
Stats: I'm 35 years old, this is my first physics class and it just seems very confusing.

The project is:

What is your volume and density? Using principles such as archimedes, or pascals, (etc) whatever applies. You must calculate your volume and denisty or a kids. Volume in cubic meters. MAY NOT TAKE MEASUREMENTS OF YOUR BODY. Must use principles learned. Once you have calculated your volume, then calculate density in kilograms per cubic meter. Next, explain procedure used to come up with volume and density and principles used-state it. Then compare your denisty to density of water for fresh and saltwater and discuss the physical ramifications of your results (think about swimming/and does your answer make sense.

Thanks!!!!!!

2007-03-10 15:52:08 · 5 answers · asked by Anonymous

I tried looking for sites in the internet with a similar problem as this but I couldn't find any. I need to find the total resistance of this set-up. Could anyone help me please? This is a picture of the set-up : http://i15.tinypic.com/2rmkzm1.jpg

Thank you very much..

2007-03-10 15:50:10 · 4 answers · asked by thehalfbloodprincess 1

When I set F=(m1)a equal to F=G(m1)(m2)/r^2 i find out that the mass m2 depends on the distance between the two objects: (m1)a = G(m1)(m2)/r^2
a = G(m2)/r^2
a(r^2)/G = m2

as you see the mass m2 depends on r, the distance between the two objects. Can someone explain me what is it that I'm doing wrong?

2007-03-10 15:30:59 · 10 answers · asked by ? 2

2007-03-10 15:04:04 · 8 answers · asked by horsegirl391 1

2007-03-10 14:52:14 · 4 answers · asked by Anonymous

Do not comprehend.

2007-03-10 14:44:57 · 10 answers · asked by Nova L. 2

Do you really think that there is a possibility that by chance and through periodic trials, one can actually walk through a wall? Because according to quantum mechanics, there is a possibility? Do you also believe that we do not really touch anything, but we are all floating on particles?

Just wondering.

2007-03-10 14:37:58 · 8 answers · asked by Sloane 1

i'm trying to find the potential energy, not the potential difference

2007-03-10 14:36:55 · 2 answers · asked by paulinatran10 1

cn u plzz describe the relationship of electrostatic force between two charged objects, the charge of the other, and the distance between charges....

2007-03-10 14:35:21 · 2 answers · asked by Anonymous

Will a bullet slow down faster if shot straight up in the air or if shot against a 100mph wind blast?

2007-03-10 13:49:15 · 4 answers · asked by Anonymous

two buddies going to sac town. On a bright sunny day , two friends are on a road trip and drive in two different cars. The two vehicle, Car A and Car B, move along interstate 80 in two different lanes going toward Sacramento.
1.) Car b is 200 m ahead of Car A and is traveling with a constant velocity of 30.0 m/s.
2.) Car A has veloctity 40.0 m/s. The driver observes Car B and applies her brakes, causing a constant acceleration of -0.100 m/s^2. In other words, Car A starts to slow down.
A.) what is the time when Car A passes Car B?
b) what is the time when Car B passes Car A?
c.) what is the velocity of Car A as a function of time?

can u please show which equations u used? plese help

2007-03-10 13:04:38 · 3 answers · asked by poodle 1

Terrence weighs 120 lbs. What would his weight be if he were travelling up in a fast elevator? The correct answer is "more than 120 lbs." ... but WHY?

2007-03-10 12:50:24 · 7 answers · asked by XD 2

A bullet with a mass of 7.00 g, traveling horizontally with a speed of 430 m/s, is fired into a wooden block with mass of 0.850 kg, initially at rest on a level surface. The bullet passes through the block and emerges with its speed reduced to 200 m/s. The block slides a distance of 46.0 cm along the surface from its initial position.

Part A: What is the coefficient of kinetic friction between block and surface?

Part B: What is the decrease in kinetic energy of the bullet?

Part C: What is the kinetic energy of the block at the instant after the bullet passes through it?

2007-03-10 12:45:45 · 1 answers · asked by Superman 1

2007-03-10 12:44:28 · 2 answers · asked by Anonymous

A 341-kg boat is sailing 13.0 ° north of east at a speed of 1.80 m/s. 22.0 s later, it is sailing 33.0 ° north of east at a speed of 4.50 m/s. During this time, three forces act on the boat: a 30.8-N force directed 13.0 ° north of east (due to an auxiliary engine), a 21.9-N force directed 13.0 ° south of west (resistance due to the water), and one due to the wind. Find the (a) the magnitude and (b) direction of the force due to the wind . Express the direction as an angle with respect to due east.

2007-03-10 12:44:15 · 2 answers · asked by Astro Geek 1

A uniform spherical shell of mass M and radius R rotates about a vertical axis on frictionless bearings(the rotation is along an axis in the venter of the sphere) . A massless cord passes around the equator of the shell, over a pulley of rotational inertia I and radius r, and is attached to a small object of mass m. There is no friction on the pulley's axle; the cord does not slip on the pulley. What is the speed of the object after it falls a distance h from rest? Use energy considerations. (Use g for acceleration due to gravity, and M, R, I, r and m, as appropriate.)

2007-03-10 12:36:40 · 2 answers · asked by x2carlosp 2

this is a question on my physics heat mixes sheet and i really dont know how to answer it can someone please help????
xxo

2007-03-10 12:26:56 · 3 answers · asked by ashleighscotch 1

NIST never mentioned why there was no resistance from the below-the-impact zones. I understand that the portion above the impact zones were very heavy, but it just seems so odd that the portions above the impact zones (14 and 32 floors respectively) had enough momentum to crush both the towers ENTIRELY in 11 and 9 seconds respectively. Now if it is estimated that the free-fall speed at the height of the towers was about 9.22...then why did the towers fall in about that same time? Shouldn't the buildings have encountered more resistance? because it did have 47 core columns and 240 perimeter columns and had 93 and 77 floors of mass beneath the impact zones. Does this defy the law of momentum?

2007-03-10 12:16:04 · 6 answers · asked by Anonymous

I normally don't see explosions as "creative", so doesn't the Big Bang represent a destructive event? Fireworks for example destroy something as they explode. If you believe in God, wouldn't God have destroyed something to produce the Big Bang?

2007-03-10 11:58:58 · 6 answers · asked by KatGuy 7