Physics - February 2007

Sodium ions (Na+) move at 0.794 m/s through a bloodstream in the arm of a person standing near a large magnet. The magnetic field has a strength of 0.26T and makes an angle 70.3 degrees with the motion of the sodium ions. The arm contains 74.8cm3 of blood, (within the magnetic field) with 1.61 x 10^20 Na/cm3. If no other ions were present in the arm, what would be the magnetic force of the arm? Answer in units of N.

2007-02-27 08:26:05 · 3 answers · asked by smb473 1

I have an ForceVSTime graph and I am supposed to give the magnitude of the impulse shown. It tells me that the max force reached is 35N and I calculated DeltaTIME to be 0.05s.... It said not to use FdeltaTIME=J.... so how would I solve it?

It said something about using a similarly shaped triangle to solve it, but none of my notes say anything about triangles in the graph. the graph is almost an inverted parabola... ???

please help? I have no clue what to do next.

2007-02-27 08:24:10 · 1 answers · asked by sam 2

one magnet for example the positive side is attatched to the bottom of your shoes, and the negative is on the floor.

2007-02-27 08:17:07 · 7 answers · asked by ze_unbeatable 1

Here's the entire question:
Four 120 ohm lightbulbs are connected in series. What is the total resistance of the circuit if they are connected in parallel?

2007-02-27 08:07:42 · 2 answers · asked by abc123 1

2007-02-27 07:50:00 · 4 answers · asked by Anonymous

can someone explain it to me(brief)

2007-02-27 07:46:30 · 1 answers · asked by Anonymous

I am trying to find a formula to calculate the power of an electric generator, based on are of coils, dimeter of wire (if it matters), rotational speed and so on. I am building one to hook up to a bike and i would like to be able to have a formula to predict voltage given all the parameters.

2007-02-27 07:44:01 · 2 answers · asked by Dave H 2

2007-02-27 07:33:48 · 3 answers · asked by Porsha M 1

2007-02-27 07:22:02 · 5 answers · asked by Anonymous

relative to the observer how is it that scientists are sure that the rate of expansion of the unverse in increasing?

2007-02-27 07:11:30 · 1 answers · asked by 5432154321 1

2007-02-27 07:09:03 · 12 answers · asked by 5432154321 1

It's a question for a physics project in for Thursday, an im really confuzed as to what the answer is! Help please!

2007-02-27 06:52:16 · 8 answers · asked by Anonymous

A fireman 46.0 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of 26.0° above the horizontal. If the speed of the stream as it leaves the hose is 40.0 m/s, at what height will the stream of water strike the building?
m (above ground level)

2007-02-27 06:28:10 · 2 answers · asked by Anonymous

what is the difference between a 383 motor and a 383 stroker?

2007-02-27 06:17:49 · 1 answers · asked by Adam B 1

In a metal conductor, current is the result of moving electrons. Can charge carriers ever be positive?

2007-02-27 06:13:35 · 1 answers · asked by cross country runner 2

the sky

2007-02-27 06:04:02 · 9 answers · asked by Porsha M 1

The choices are:
a) a ball bouncing on the floor
b) a child swinging on a swing
c) a piano wire that has been struck
d) a car's radio antenna waving back and forth

2007-02-27 05:55:54 · 4 answers · asked by jack 1

2007-02-27 05:44:26 · 2 answers · asked by Anonymous

A wheel having more diameter than other, then the wheel having more diameter will make more displacement within less number of rotations or revolutions than the other(second wheel). Did you observe this...? So I think we prefer wheels having more diameter.

2007-02-27 05:33:51 · 9 answers · asked by karnam r 1

Please simplify as much as u can ;-)

2007-02-27 05:27:45 · 6 answers · asked by Stream 1

if anyone can tell me, that would be great. or, if anyone could find me a website, that would be great too! thanks!

2007-02-27 05:21:00 · 3 answers · asked by Anonymous

The best leaper in the animal kingdom is the puma, which can jump to a height of 12.2 ft when leaving the ground at an angle of 43°. With what speed, in SI units, must the animal leave the ground to reach that height?
m/s

2007-02-27 05:05:03 · 1 answers · asked by Anonymous

the materials used in the production

2007-02-27 05:04:48 · 2 answers · asked by akki the cool guy 1

2007-02-27 04:54:05 · 1 answers · asked by Desi 1

2007-02-27 04:29:25 · 13 answers · asked by mili 1

2007-02-27 04:20:57 · 5 answers · asked by Anonymous

2007-02-27 04:00:28 · 10 answers · asked by Anonymous

when water condenses, heat energy is released. Explain this in terms of particles and changing state.
Please answer

2007-02-27 04:00:27 · 3 answers · asked by Anonymous

2007-02-27 03:59:02 · 7 answers · asked by Anonymous

2007-02-27 03:09:09 · 16 answers · asked by Amal 2