Physics - February 2007

The following sound waves have what velocity?
(a) Midddle C, f = 256 Hz and lamda = 1.34 m ___m/s
(b) The note A, f = 440.0 Hz and lamda =78.0 cm ____m/s
(c) A siren with f = 744.0 Hz and lamda = 46.1 cm ___m/s
(d) A note from stereo with f =2700.0 Hz and lamda = 12.70 cm ____m/s

2007-02-10 11:26:48 · 2 answers · asked by Hey ;) 3

A sound wave with a frequency of 360 Hz moves witha velocity of 380 m/s. what is the distance from one condensation to the next?____m

2007-02-10 11:22:43 · 2 answers · asked by Hey ;) 3

A warning buoy is observed to rise every 5.8 s as crests of waves pass it. (a) what is the peroid of these waves?____s
(b) what is the frequency?____Hz

2007-02-10 11:21:19 · 2 answers · asked by Hey ;) 3

If the velocity of a 580-Hz sound is 1045 ft/s in the air and 5470 ft/s in seawater, find the wavelength of this sound in (a) air and____ft
(b) seawater.___ft

2007-02-10 11:17:05 · 1 answers · asked by Hey ;) 3

which quantum physicist out there is closest to it??

2007-02-10 11:01:02 · 8 answers · asked by Tony M 1

If someone says that a negative acceleration always means that the moving object is decelerating. is this statement true and why?

2007-02-10 10:53:42 · 6 answers · asked by Anonymous

A train n a straight, level track has an initial speed of 35kn/hr. a uniform acceleration of 1.5 m/s^2 is applied while the train traels 200m. a)whaat is the speed of the train at the end of the distance?b) who long did it take the train to travel the 200 m?
someone please help i have been doing this one all day and i still cannot figure out what the answer is????

2007-02-10 10:51:08 · 3 answers · asked by Anonymous

Einstein or Isaac Newton?

2007-02-10 10:23:46 · 6 answers · asked by Anonymous

The TMA-2's turned Jupiter into a star by compressing the matter that was there by building new TMA-2's from the planet's material. This resulted in an exponential consumption of the planets mass since the new TMA-2's took in more mass and then replicated. As a planet is compressed, its gravitational force goes up -- force = GMm/r^2 where r is the radius of the planet. As you can see, the smaller the radius the higher the gravity. If you make it small enough it will provide enough force to fuse hydrogen (which Jupiter has plenty of). Something similar was done in "Imperial Earth" when they created microscopic black holes. Ok, now that Jupiter has been compressed small enough to start a fusion reaction, would it be stable or just burn out rapidly. How long would it last?

2007-02-10 10:13:34 · 2 answers · asked by Zefram 2

1. the modern atomic model is based on the principles of ?

2. Greek philosophers who studied the smallest particles of matter were called ?

3.The atomic theory of matter was developed by ?

4.The positivly charged particles in the nucleus of an atom is the?

5. The passage of an electric current through a gas was used by J.J Thomson in experiments that led to the discovery of the ?

6. The nucleus of the atom was first discovered by ?

7. The theroy that electrons are located in specific energy levels was first proposed by ?

8. The --- is the center of an atom.

9. atoms of the same element that have the same number of protons but differeing numbers of neutrons are called ---.

10. The subatomic particle that is neutral is the ---.

11. A (An) --- is a negitivly charged particle.

12. According to modern atomic theory, --- can move from one energy level to another.

can you answer any of these ?

thanks :)

2007-02-10 10:12:54 · 4 answers · asked by luckyplaya23 2

the traditional model: What experimental evidence supports the idea of the existence of atoms, their structure and their subatomic particles, i.e., protons, neutrons, and electrons?

Anyone knows how to answer these? Does anyone knows a good link i can have so I can answer this question?

2007-02-10 10:12:43 · 3 answers · asked by Dante Jr 2

a 27 pound meteorite struck a car, leaving a dent 25 cm deep in the trunk. If the meteorite struck the car with a speed of 650 m/s, what was the magnitude of its deceleration, assuming it to be constant? is it 2.11e5

2007-02-10 09:36:24 · 3 answers · asked by soccerjock 2

perhaps I should have post this in the philosophy section but I believe here was more apropriate.
the question is;
If the 0 dimension is a point
the 1st dimension a line without width
the second, a square without depth
and the 3rd a cube (without god knows 'what')

Is there a way to visualize (or conceptualize) the fourth dimension?
and ofcourse what would the 'what' as stated above be, or 'might'

2007-02-10 08:56:48 · 7 answers · asked by zentoccino 2

A car is initially traveling due north at 19.0 m/s.Find the velocity of the car after 5.50 s if its acceleration is instead 1.95 m/s2 due south. it's in opposit dir. in south.

2007-02-10 08:47:26 · 1 answers · asked by soccerjock 2

a jet passes overhead at an altitude of 500m. when the plane is directly overhead, the sound of its engine appears to come from a point at the same altitude but 500tan(22degrees) away. [[[They give a figure in which the sound at point A, the airplane, and the observer at ground level form a right triang.e with the vertex at which the observer stands is a 22 degree angle]]] If the average temperature of the air is 10.0 degrees C, how fast is the plane moving?
ok so i figured out that the speed of sound in air is 337m/s, but how do I calculate the plane's velocity?

2007-02-10 08:25:08 · 1 answers · asked by tmrrwtdy 1

2007-02-10 08:10:06 · 23 answers · asked by rickttees 1

Creativity is more or less what I'm looking for.

2007-02-10 08:07:26 · 12 answers · asked by shizpickle 2

A ball weighs 1.62oz or 45.93139g or .459kg

How many and how would I transform this into Newtons?

Ultimately, I want to find out how much mass this object would have on Earth.

g=9.81m/s^2

2007-02-10 07:25:26 · 6 answers · asked by travo 1

2007-02-10 07:13:22 · 2 answers · asked by Anonymous

A magnetic field has a magnitude of 1.2 10e-3 T, and an electric field has a magnitude of 5.7 10e3 N/C. Both fields point in the same direction. A positive 1.8 µC charge moves at a speed of 2.9 10e6 m/s in a direction that is perpendicular to both fields. Determine the magnitude of the net force that acts on the charge.

Now, wouldn't I add the force of the magnetic and electric fields together to get the answer? I came up with .0183 but my homework site is telling me I'm wrong.

2007-02-10 07:11:13 · 3 answers · asked by Confused 1

How can light go from 186,000 MPS to zero without changing speed? Is there something wrong with black hole theroy or the Einstienian contention that the speed of light is constant.

2007-02-10 06:34:06 · 9 answers · asked by Anonymous

I would like everyone to express a moment of epiphany. I beleive that there alot of life's questions out there that have stumped even the most brilliant minds in history that can be answered by an unknown person somewhere. If you have a thought on anything relating to mysteries or scientific paradoxes or any other kind of unsolved delima, let's hear your view on it. What do you think about black holes? or Explain the true nature of gravity and how it works? or Is light a wave or a particle? etc.. etc.. Pick any topic and give us your view. Show us that publicly renoun scientists are not the only smart people out there.... or prove that they are.

2007-02-10 06:17:21 · 5 answers · asked by Anonymous

My reading indicates that many physicists think that space-time has an actual 'fabric' to it; it is a 'plenum' full of exotic 'things' such as virtual particles, wave fluctuations, and so on. If this is right, then is space-time itself the "ether" that Newton speculated about? If space-time is an actual "thing" unto itself and not mere "nothingness", does that "thing" ever move? Or could it be the one completely motionless thing there is?

2007-02-10 06:11:57 · 4 answers · asked by Mr_Sageseer 2

If you pulled a torpedo out of a submarine's torpedo tube, would it sink or float?

2007-02-10 06:01:02 · 4 answers · asked by jack_riley50 1

one of the mables is steel and the other is plastic

2007-02-10 05:14:26 · 2 answers · asked by Anonymous

Please help, It is very imp. that I figure this out for my geophysics midterm. It's coming up!!!!

I would appreciate help with this so much & definitely would pick the best answer!! Thank-you in advance.

2007-02-10 05:12:30 · 2 answers · asked by Anonymous

Thereare two elec.bulbs 60W,220V and 100W,220V. Which has the higher resistance?

2007-02-10 05:10:06 · 5 answers · asked by PLK 1

2007-02-10 05:04:27 · 7 answers · asked by Anonymous

2007-02-10 04:55:11 · 4 answers · asked by Ajit S 1

I am interested in defining pychosocial interactions in terms of the properties of light. I have an inkling that we experience some sort of time warp if the theory of relativity applies in human experience/consciousness.

2007-02-10 04:49:08 · 2 answers · asked by noevgo 1