Physics - April 2007

(AxB)2+(A.B)2=A2B2(consider only the magnitude of AxB)

This is from scalar and vector problems

2007-04-20 20:58:35 · 3 answers · asked by Anonymous

I will be very thankful.

2007-04-20 20:07:36 · 3 answers · asked by Harsh 2

2007-04-20 19:58:10 · 9 answers · asked by mohan 1

A composite rod is made from stainless steel and iron and has a length of 0.50m. The cross section of this composite rod consists of a square within a circle. The square cross section of the steel is 1.0cm on a side. The temperature at one end of the rod is 78 degrees C, while it is 18 degrees C at the other end. Assuming that no heat exits through the cylindrical outer surface, find the total amount of heat conducted through the rod in two minutes.

PLease help me out! thanks a bunch.

2007-04-20 16:42:59 · 2 answers · asked by jamet002 2

I only have the time equation and I get 0.69 seconds... but how do i get the quantity?
thank you

2007-04-20 16:05:34 · 10 answers · asked by Karenly 2

Hi any and everyone its mica here
how does passing a current through a selonoid create a magnetic field. I want to know exactly how there Amps law and maxwel equation but how does it actully happen? pls I am doing a lab report and am extremly confused.

2007-04-20 15:54:42 · 3 answers · asked by cannabisshive 1

thanks

2007-04-20 15:37:47 · 3 answers · asked by Anonymous

2007-04-20 15:18:57 · 10 answers · asked by kirztel 1

European bitches!
also, what does this question mean?

2007-04-20 14:05:08 · 5 answers · asked by Anonymous

A 5.8 m diameter merry-go-round is rotating freely with an angular velocity of 0.50 rad/s. Its total moment of inertia is 2200 kgM2. Four people standing on the ground, each of 60 kg mass, suddenly step onto the edge of the merry-go-round.
(a) What is the angular velocity of the merry-go-round now?
(b) Assume that the people were on it initially and then jumped off in a radial direction (relative to the merry-go-round). What would be the angular velocity of the merry-go-round?

2007-04-20 12:33:02 · 2 answers · asked by Anonymous

In a movie, Tarzan evades his captors by hiding underwater for many minutes while breathing through a long, thin reed. Assuming the maximum pressure difference his lungs can manage and still breathe is -72 mm Hg, calculate the deepest he could have been

2007-04-20 12:27:27 · 7 answers · asked by Anonymous

Why is there a speed limit in the first place? Is this question even answerable?

2007-04-20 12:05:54 · 9 answers · asked by the redcuber 6

My friend says since objects fall to the ground at 9.8 meters per second, that if you fired a gun into the air completely parallel to the ground at a height of 9.8 meters, than the bullet would take 1 second to reach the ground after it was fired. I think the force on the bullet to move forward would counter-act the force of gravity for a while, causing the bullet to stay in the air for longer than a second. What is the correct theory???

2007-04-20 11:36:01 · 13 answers · asked by Milo 1

1 - Define what is meant by a Black-body and provide a Black-body spectra for two objects:1 at temp T1 and the other at temp T2 where T1 > T2?
2 - A black-body spectrum is found to have a corresponding mean photon energy of 1,55eV.What is the temp of the object that gives rise to this black-body spectrum?

2007-04-20 10:52:44 · 1 answers · asked by woutie 2

well?

2007-04-20 10:05:52 · 9 answers · asked by Anonymous

2007-04-20 09:59:45 · 1 answers · asked by lord_andys_new_id 1

Assuming the planet in the picture is of earth-size, how powerful are the nukes causing the explosions in the picture? If you can give me the answer in megatons/gigatons, I'll be very grateful!

http://www.geocities.com/darth_timon/firststrikenukes.JPG

2007-04-20 09:35:49 · 3 answers · asked by darth_timon 3

Since a quantum computer uses the quantum superposition it works very similare to our brain. Electric impulses are send through many neurons at the same time. Do you think that that might be the key to the human mind? Science answers please and no religious b*** s***

2007-04-20 09:28:28 · 7 answers · asked by mareklspak 1

My friend wants to jump over my pool on a moped.
Top speed of the moped is 35mph-ish. The swimming pool is 40' long. If I don't want to end up with motor oil in my pool, should I let him try (besides the obvious legal implications if he totally eats it, of course).

2007-04-20 09:20:20 · 5 answers · asked by dudeallimsayin 1

2007-04-20 08:53:31 · 5 answers · asked by Anonymous

Alright, this was just a random question that popped into my head. Let's say you have a long, LONG pole, that stretches from Earth to Neptune. Let's also say that the pole is made out of diamond, and so is one big macromolecular structure, incompressible.

Say I have a Neptunian friend who wants to know whenever Man U scores a goal in the UEFA Champions League 2050, played on Earth. But it would take minutes before the information was transmitted to him via TV/radio, because information can only travel at the speed of light. So we rig this special long pole and connect it from my house to his house, across the solar system. We agree that we would both hold each end, and when Man U scored, I would push the pole, using it to give him a nudge, so he'd know.

I watch the match, and when Man U scores, I push the pole. Now, doesn't he feel the nudge immediately? What's the flaw with this reasoning that contradicts the special theory of relativity?

2007-04-20 08:48:02 · 3 answers · asked by Benjamin L 2

Why are gamma rays more dangerous to humans than radio waves?

2007-04-20 08:46:07 · 4 answers · asked by Anonymous

2007-04-20 08:41:03 · 8 answers · asked by danni 1

the frequency, wavelength, speed, or amplitude? why?

2007-04-20 08:37:24 · 2 answers · asked by Anonymous

What is the current of the coil while it is operating?
3.3 x 10-2 A
3.3 x 10-1 A
3.0 x 10-1 A
3.0 x 101 A

2007-04-20 07:13:01 · 9 answers · asked by Sesily E 1

What is the equivalent resistance of the circuit?
1.1 x 10-1ohms
1.9 x 101 ohms
9.0 ohms
1.9 x 102 ohms

Can you help me please :( I have tried and tried

2007-04-20 07:10:30 · 5 answers · asked by Sesily E 1

2007-04-20 07:02:56 · 7 answers · asked by sp singh 1

2007-04-20 07:01:01 · 5 answers · asked by sp singh 1

2007-04-20 06:56:00 · 5 answers · asked by sp singh 1

I am doing a physics project but needed some help. What is an everyday use of a lens or reflection/refraction. We have to find how it is used in everyday life or something that relates like a machine or theory. I am kind of stuck. Could someone help me out.

2007-04-20 06:55:30 · 2 answers · asked by Danielle 2