Physics - October 2006

A 4.5 kg dog stands on an 18 kg flatboat, and is 6.1 m from the shore. He walks 2.4 m along the boat towards the shore, and then stops. Assuming there is no friction between the boat and water, find how far the dog is from the shore.

Imagine the dog moves leftward and the boat moves rightward, but does the center of mass of the boat + dog system move?

2006-10-19 16:41:47 · 4 answers · asked by Anonymous

There is a maximum depth at which a diver can breathe through a snorkel tube because as the depth increases, so does the pressure difference, tending to collapse the diver's lungs. Since the snorkel connects the air in the lungs to the atmosphere at the surface, the pressure inside the lungs is atmospheric pressure.

What is the external-internal pressure difference (in Pa) when the diver's lungs are at a depth of 6.1 m (about 20 ft)? Assume that the diver is in fresh water. (A scuba diver breathing from compressed air tanks can operate at greater depths than can a snorkeler, since the pressure of the air inside the scuba diver's lungs increases to match the external pressure of the water.)

2006-10-19 16:35:17 · 2 answers · asked by Anonymous

iF IT HAS ENERGY THEN IT MUST HAVE A LINEAR MOMENTUM

2006-10-19 16:30:30 · 3 answers · asked by goring 6

Please explain to me as though I am a layman, I came across an article in which the noble laureates of last year had proved that beta function can be negative, but I didn't understand how.
P.S. I am a 16 year old studying in class 11.

2006-10-19 16:20:02 · 3 answers · asked by Raj S 2

2006-10-19 16:03:19 · 1 answers · asked by Mariah A 1

http://www.webassign.net/hrw/W0080-N.jpg

The above site gives the diagram to the problem that I am working with.

It shows three blocks attached by cords that loop over frictionless pulleys. Block B lies on a frictionless table; the masses are Block A = 6.00 kg, Block B = 8.00 kg, and Block C = 10.0 kg. When the blocks are released, what is the tension in the cord at the right?

I tried setting this problem up so that I subtracted my right tension equation (or atleast what I thought was my right tension) from my left tension equation, and it came out to a really small number. I've been attempting several ways and I just have no idea how to do this. Any help would be appreciated very much!!

2006-10-19 15:46:10 · 1 answers · asked by Anonymous

Anything will help(no seriously)
Please,Please,Please,Please,Please,Please,Please,Please,

2006-10-19 15:36:16 · 8 answers · asked by ohmygoshhello 2

Anything will help(no seriously)
Please,Please,Please,Please,Please,Please,Please,Please,

2006-10-19 15:35:40 · 2 answers · asked by ohmygoshhello 2

it assume every particles in the universe have an antiparticles ie(proton has antiproton, electoron has positron) usually when a particle meet there counter part they annihlate each other; because they have opposite charges. Neutron also have antiparticle but neutron doesn't have any charges. How can they annihilate each other?

2006-10-19 15:16:36 · 4 answers · asked by Anonymous

I'm a senior in high school and I'm really interested in physics and math, and I wanted to know some available careers in the physics field. I know engineering is one of them. It would be nice if you gave me the career and a brief explanation of what that career does.

2006-10-19 15:16:00 · 4 answers · asked by physicsgeek330 2

Lets say: 1 metre per hour. And had a flash light that would could that, if I pointed it to person standing 2 meters away would he/she actually see the flash light as if it was switched off until the light reached them? (always in theory of course)

2006-10-19 15:01:41 · 10 answers · asked by Nostromo 5

Wouldn't in theory still be working under the surface? Even for a while? Oil is not a conductor and we know that water doesn't actually do the damage but the short circuits produced.

2006-10-19 14:47:25 · 8 answers · asked by Nostromo 5

What is the frequency (f), of a UV Ray (Ultraviolet Ray) in hertz (Hz). Thanks.

2006-10-19 14:41:00 · 3 answers · asked by LML 1

OK always in theory. Lets say that it would be long enough to extend beyong the earth's magnetic field. Would it weight less if we used a scale to measure its weight? (Less than what it would weight if it was in pieces and within the earth's magnetic field.)

2006-10-19 14:34:45 · 8 answers · asked by Nostromo 5

Would a person (always in theory) be able to push a huge object like the size and weight of the Titanic, for example? (Provided that the person has a solid place to stand and use for stability so he wont have his own body pushed back)

2006-10-19 14:29:56 · 11 answers · asked by Nostromo 5

A 4.5 kg dog stands on an 18 kg flatboat, and is 6.1 m from the shore. He walks 2.4 m along the boat towards the shore, and then stops. Assuming there is no friction between the boat and water, find how far the dog is from the shore.

Imagine the dog moves leftward and the boat moves rightward, but does the center of mass of the boat + dog system move?

2006-10-19 13:48:45 · 1 answers · asked by Anonymous

In the ammonia (NH_3) molecule, the three hydrogen (H) atoms form an equilateral triangle; the center of the triangle is 9.40*10^-11 m from each hydrogen atom. The nitrogen (N) atom is the apex of a pyramid, with the three hydrogen atoms forming a base. The nitrogen-to-hydrogen atomic mass ratio is 13.9, and the nitrogen-to-hydrogen distance is 10.14*10^-11 m. Locate the center of mass of the molecule relative to the nitrogen atom, and explain how you got your answer.

2006-10-19 13:13:41 · 2 answers · asked by Anonymous

2006-10-19 13:13:28 · 5 answers · asked by Sunday S 1

2006-10-19 13:13:13 · 18 answers · asked by Deedra J 1

2006-10-19 13:11:33 · 4 answers · asked by Deedra J 1

2006-10-19 13:09:19 · 4 answers · asked by Blake C 1

2006-10-19 13:09:13 · 5 answers · asked by Deedra J 1

2006-10-19 12:49:09 · 2 answers · asked by sherm89trx 1

2006-10-19 12:32:45 · 3 answers · asked by Anonymous

If the law of thermodynamics prove that Perpetual Motion is impossible, why does the earth and other planets keep rotating for thousands of years?

2006-10-19 12:31:29 · 12 answers · asked by Ste P 1

2006-10-19 12:30:08 · 12 answers · asked by Anonymous

I am doing a science project on the effects of centrifugal force on plant growth, more specifically the effect of artificial increased gravity on plant growth. Can anyone give me a formula to find centrifugal force and how to convert force that to artificial gravity?

2006-10-19 12:29:16 · 3 answers · asked by CanBo 1

You see it in films, but does it work? Is it possible to sit on a river bed and hide from the baddies with a tube and breathe air? Is there a depth when this is impossible?

2006-10-19 12:25:18 · 8 answers · asked by JohnnyH 1

I am doing a project on the effect of centrifugal force on plant growth. I need a formula to calculate the amount of force on the plant. Does anyone have any???

2006-10-19 12:01:34 · 3 answers · asked by CanBo 1

2006-10-19 11:52:00 · 5 answers · asked by Anonymous