Physics - March 2007

I have heard that Richard Feynman has said that there is only one electron in the world! He has done it using complicated space time diagrams which show antielectrons moving backward in time!

Can you please explain what he meant by "one electron" ?

2007-03-23 16:20:41 · 6 answers · asked by sh 1

Please help explain the change of the potential energy and potential of a proton moving in the same direction as the electric field. (i.e. P.E. increases, potential decreases). But also, please explain WHY this is so.

I will give my best answer to the most the person who answers most thoroughly and so I can understand it the best, not the fastest answerer. Thank you in advance.

2007-03-23 16:08:35 · 3 answers · asked by Texas Cowgirl 3

Please help to explain to me the following question!

A power station delivers 520 kW of power to a factory through wires with a total resistance of 3Ω. How much power is wasted if the electricity is delivered at 50 kV vs. 12kV.

Thanks in advance! I will give my best answer to the person who can best explain the correct answer and how to get there, not the fastest person.

I can handle the algebra easily, so don't worry about spoon feeding the algebra. I just would like help with the equation part of it.

Thanks in advance!

2007-03-23 16:04:46 · 2 answers · asked by Texas Cowgirl 3

Please help me solve for the magnitude and direction of the current through each resistor (ignore the colons):
_v2___v1__
|::::::::::|:::::::::::|
|:::::::::r2:::::::::|
|_r1__|__r3_|

Thanks in advance! I will give my best answer to the person who can best explain the correct answer and how to get there, not the fastest person.

I can handle the algebra easily, so don't worry about spoon feeding the algebra. I just would like help with the equation part of it.

Thanks in advance!

2007-03-23 16:01:52 · 2 answers · asked by Texas Cowgirl 3

or tell me a website where i can get help

2007-03-23 15:51:52 · 4 answers · asked by shelly 3

ok, I was given a Chem problem and told to find the kinetic energy of a 45g golf ball moving at 61m/s and I calculated that it had 84J (or 20cal) of kinetic energy. I was then asked what happened to this energy when the ball lands in the sand and the answer I was given was that the energy would be transfered from the ball to the sand thus causing the sand where the ball landed to change in shape. Now, what I don't get is was it the energy from the ball or simply the ball's mass that caused the sand to change shape?

2007-03-23 15:45:17 · 6 answers · asked by The monkey did it! 1

http://s113.photobucket.com/albums/n221/TranscendMS/?action=view¤t=CCI03232007_00000.jpg

2007-03-23 15:18:54 · 4 answers · asked by lirael1019 1

An electron experiences the greatest force as it travels 2.9x10^6 m/s in a magnetic field when it is moving northward . The force is upward and of magnitude 7.2x10^-13 N. What is the magnitude and direction of the magnetic field?

2007-03-23 14:59:41 · 1 answers · asked by Anonymous

2007-03-23 14:26:43 · 14 answers · asked by camhunt13 2

Is there a video that can show me what happens step by step? or can someone out there clearly explain it to me

2007-03-23 14:26:03 · 4 answers · asked by iSmile 2

2007-03-23 14:18:56 · 5 answers · asked by drunken pumpkin 6

2007-03-23 14:04:34 · 5 answers · asked by ☼Scientific Athletic♫ 4

2007-03-23 13:55:17 · 12 answers · asked by Anonymous

can you think of any forces ,or states, or anything for that matter that doesn't have an opposite?

2007-03-23 13:50:21 · 3 answers · asked by Anonymous

How do i answer my questions: "What is light?" and "What is light made of?" by means of experiments?

2007-03-23 13:48:38 · 4 answers · asked by ☼Scientific Athletic♫ 4

I'm not asking what color are diamonds or coal, but pure carbon when it is isolated. The color of the atom carbon.

2007-03-23 13:43:18 · 8 answers · asked by sonata7forte 1

i always pick the best answers. thank you so much
1)What would occur as a result of the frictional drag of the atmosphere on an artificial satellite orbiting the Earth?

a. The satellite would increase in speed and escape the gravitational field of the Earth.
b. The satellite would increase in speed and spiral toward the Earth.
c. The satellite would decrease in speed and escape the gravitational field of the Earth.
d. The satellite would decrease in speed and spiral toward the Earth.

2)When electricity flows back and forth, we call it

a. alternating current
b. direct current
c. a series circuit
d. a parallel circuit

3)A jack is a device that is used to lift a car so that a tire can be changed. If a person uses a force of 100 N to lift an 8000 N car, what is the mechanical advantage of the jack?

a. 0
b. 100%
c. 80
d. 1/80

4)As the mass of a body increases, its gravitational force of attraction on the Earth

decreases
increases
remains the same

2007-03-23 13:41:18 · 6 answers · asked by couturevogue 3

Q=Q0(1-e to the square root -t/pie) and Q=Qo e to the square root -t/pie for charging and discharging?

2007-03-23 13:34:19 · 1 answers · asked by ... 3

need sources plz

2007-03-23 13:28:50 · 1 answers · asked by Sm1l3y 2

i need answers! i'll PICK THE BEST ANSWERS!
thank you

1)A student pulls a box across a horizontal floor at a constant speed of 4.0 meters per second by exerting a constant horizontal force of 45 newtons. Approximately how much work does the student do against friction in moving the box 5.5 meters across the floor?

A. 45 J
B. 180 J
C. 250 J
D. 740 J

2)A force of 5.0 newtons moves a 2.0-kilogram object a distance of 3.0 meters in 3.0 seconds. How much work is done on the object?

a. 1.0 J
b. 10. J
c. 15 J
d. 30. J

3) The area affected by a magnet is called a magnetic

a. field
b. node
c. pole
d. storm

4)Which element is not magnetic?

a. Fe
b. Co
c. Al
d. Ni

5) Which is magnetic?

Fe
Cu
Hg
Br

2007-03-23 13:19:27 · 4 answers · asked by couturevogue 3

The answer has something to do with 10 raised to exponent minus 43 seconds ago. What has the question got to do with constand vibration in space & OM?

2007-03-23 13:12:08 · 2 answers · asked by Ke Xu Long 4

Some men spend a lifetime in an attempt to comprehend the complexities of women.Others pre-occupy themselves with somewhat simpler tasks, such as understanding the theory of relativity. ALBERT EINSTEIN.

2007-03-23 12:45:48 · 4 answers · asked by Birdman 7

2007-03-23 12:40:15 · 8 answers · asked by Anonymous

i have heard of it before but i was never told what it was. please help. thanks.

2007-03-23 12:26:11 · 3 answers · asked by Anonymous

Can someone help me with this question?

Suppose that the mass of an elevator and passengers were 1500 kg and the frictional force was 9000 N (wheels on tracks). Use g = 10 N/kg

Can you describe what the force diagram looks like?

What is the acceleration?

Suppose that a 50 kg woman is standing on a bathroom scale is in the elevator car. What would the scale read? Can you describe what the force diagram would look like?

2007-03-23 12:14:21 · 2 answers · asked by abxamz 1

2007-03-23 12:13:57 · 7 answers · asked by Yako 2

i'm just curious how long it takes that pot of water to cool down to the ideal temperature for brewing white tea, without using a thermometer.. just for curiousity's sake and because i don't have a thermometer :)

2007-03-23 11:58:19 · 3 answers · asked by sims 1

2007-03-23 11:37:46 · 2 answers · asked by trer 3

decrease, and why?

2007-03-23 11:19:39 · 2 answers · asked by ... 3

2007-03-23 11:18:13 · 5 answers · asked by ... 3