Physics - March 2007

i have to give a seminar on earths core and emf...(being physics student), can anyone gimme useful links? plus, i need some really dire effects of the failure of emf...by tomorrow 9pm(PST), thanks

2007-03-13 07:08:55 · 2 answers · asked by aruza_naeem 1

I have an Uncle that says he can save me a lot of money by building all my studio equipment. I have seen a reverb processor and a mix board he made and it looks and sounds great but I am still scepticle. He knows what he is doing (he used to be a nuclear physics professor and does electronics on the side for 30 yrs) but how can I be sure that the equipment is not sub par? what questions do I need to ask or should I just buy my equipment which will have warranties?? Are their electrical guidelines that need to be followed? Please help???

2007-03-13 07:05:58 · 1 answers · asked by Anonymous

if an airplane is crashing.... and its over the ocean, say it doesnt break apart in the air, is it possible for the plane to hit the water and stay whole, and for the passengers in the plane to still be alive when it hits? so then say the plane is still whole and people are still alive the plane goes underwater and sinks to the bottom of the ocean and all the people in it drownd. could that happen? scientifically?

2007-03-13 06:57:34 · 4 answers · asked by Anonymous

An apple weighs 1.04 N. When you hang it from the end of a long spring of force constant 1.60 N/m and negligible mass, it bounces up and down in SHM. If you stop the bouncing and let the apple swing from side to side through a small angle, the frequency of this simple pendulum is half the bounce frequency. (Because the angle is small, the back and forth swings do not cause any appreciable change in the length of the spring.)

a) What is the unstretched length of the spring (i.e., without the apple attached)?

2007-03-13 06:49:34 · 2 answers · asked by Paul Wall 2

Your boss at the Cut-Rate Cuckoo Clock Company asks you what would happen to the frequency of the angular SHM of the balance wheel if it had the same density and the same coil spring (thus the same torsion constant), but all the balance wheel dimensions were made one-third as great to save material.

a) By what factor would the frequency change?
b) Would the frequency increase or decrease by the factor found in part (a)?
c) By what factor would the torsion constant need to be changed to make the smaller balance wheel oscillate at the original frequency?
d) Would the torsion constant need to be increased or decreased by the factor found in part (c)?

2007-03-13 06:48:23 · 7 answers · asked by Paul Wall 2

Trees are able to shift water from their root level to their leaves and fruits by a physical phenomenon known as osmosis. This phenomenon can be observed by immersing a capillary tube into a vessel full of water. It can be seen that water level in the tube rises above the level of the water in the vessel. Thinner the capillary tube, the higher level of the water above the water in the vessel. Therefore, it should be possible to shift water to a higher level if we had very thin, long and flexible capillary tubes which can be bundled together in great numbers, so that the water lifted is substantial. One end of the bundle can be dipped into a water source and the other end brought to a higher level. Is there a flaw in this idea? If it works, we would be generating potential energy from nothing! It seems impossible as it violates the physical law of "conservation of energy", but I cannot see the flaw in it? I am sure somebody out there should be able to point out the flaw.

2007-03-13 06:26:23 · 9 answers · asked by East Ender 2

If time travel is possible (regardless of whether or not we can do it yet), does that mean that time travellers from the future may have already altered our present- and we do not know about it, seeing as we would be unaware?

Also is it possible that time travel will happen in the future, and that time travellers will travel back to a period which is still our future (for example they travel back from the year 2500 to 2400)?

I know I haven't got much of a grasp of the concept, but thanks!

2007-03-13 06:25:27 · 16 answers · asked by Anonymous

Any help is appreciated on this. I don't really understand it.

Given: V = kq/(x^2 + y^2 + z^2)^1/2
I Found: E = [kq(x + y + z)]/(x^2 + y^2 + z^2)^(3/2)

Question: What charge distribution does the potential represent? (It doesn't ask why, but if you could explain I would be greatful, Thanks!)

2007-03-13 06:21:16 · 1 answers · asked by ecogrl23 2

2007-03-13 06:10:15 · 5 answers · asked by Dayne's gal 2

Hello, could i have help with the following please?
The charge on the plates of a capacitor is 8mC when the potential between is 5kV. Determine the capacitance of the capacitor.

Cheers

2007-03-13 06:01:01 · 4 answers · asked by MoLeY 1

Hello,
Is there a website that would help me with the following,
Describe a suitable experiment to investigate the variation of capacitor voltage and current during charge and discharge cycles. You will need to select suitable values for the components and produce a typical solution to the problem described theoretically.

Cheers
Stuart

2007-03-13 05:57:44 · 1 answers · asked by MoLeY 1

2007-03-13 05:52:30 · 6 answers · asked by Ambegurl 3

2007-03-13 05:50:36 · 4 answers · asked by Anonymous

the linear impulse delivered by the hit of a boxer is 249 (n)(s) during the .176 s of contact. what is the magnitude of the average force exerted on the glove by the other boxer ?

2007-03-13 05:49:12 · 1 answers · asked by Anonymous

A fisherman who has a small but a very heavy object in his boat. He is fishing in a pond which has no inlet or outlet (for the problem's sake). Accidentally he drops this small but very object into the pond. As a result of this careless act, would the level of the water of the pond rise,fall or remains the same?

2007-03-13 05:46:35 · 16 answers · asked by East Ender 2

when a pair of hydrogen isotopes are fused is the mass of the product nucleus more or less than the total mass of the hydrogen nuclei

2007-03-13 05:40:07 · 3 answers · asked by quickwitygurl08 1

this is the information and this is what i need to find..

V1=300cm3 T2=333K
T1=293K P2=4.5 bar
P1=1 bar V2=?

i followed this equation but the result is weird..

V2= P1V1T2 : T1P2

i dont know where i am wrong...

2007-03-13 05:26:23 · 2 answers · asked by aly 1

in a circus performance, a monkey is strapped to a sled and both are given an initial speed of 3m/s up a 28 degree incline track. the combined mass of monkey and sled is 22 kg, and the coefficient of kinetic friction between the sled and incline is .45, the acceleration of gravity is 9.8 m/s^2. how far up the incline does the sled move ? answer in units of meters.

2007-03-13 05:09:42 · 2 answers · asked by Anonymous

is work required to pull a nucleon out of an atomic nucleus? does the necleon once outside the nucleus have more mass than it had inside the nulceus?

2007-03-13 05:03:10 · 4 answers · asked by Orlando J 1

There are four masses hanging from a ceiling in a straight line, m1,m2,m3,m4 each connected by a rope(with negligable mass), and u are given the tension between the ceiling and mass1 equals T1 and the tension below mass1 equals T2,
show that:
m4=(m1 x T2)/(T1 - T2) - m2 - m3

2007-03-13 04:50:26 · 2 answers · asked by gamegenius5 2

what is the function of control rods in a nuclear reactor

2007-03-13 04:48:51 · 2 answers · asked by Orlando J 1

how is a nuclear reactor similar to a convetional fossil fuel power plant are there any differences between the two

2007-03-13 04:47:17 · 4 answers · asked by Orlando J 1

is a chain reaction more likely to occur in teo separate peices of uranium-235 or in the same pieces stuck together

2007-03-13 04:45:29 · 2 answers · asked by Orlando J 1

2007-03-13 04:43:02 · 7 answers · asked by Orlando J 1

2007-03-13 04:15:28 · 2 answers · asked by Anonymous

2007-03-13 04:15:17 · 7 answers · asked by aggers0421 1

2007-03-13 04:10:48 · 3 answers · asked by ace 2

he is jumping at that time the train is also moving but how he can jump to another place,

2007-03-13 04:09:24 · 4 answers · asked by Raja 1

agree or disagree?why?..please answer.i need it for proj in physics..tanx

2007-03-13 04:06:19 · 6 answers · asked by ace 2

2007-03-13 04:03:11 · 6 answers · asked by market.deals 1