Physics - August 2007

Back in high school, my counselor refused to let me take physics without taking pre-calculus. Now that I'm in college, I need to take physics for my intended major. I intend to take calculus, but is it okay if I take both classes at the same time or do you recommend I take calculus first before taking a physics class?

2007-08-14 14:54:01 · 8 answers · asked by karmagfaqs 3

And also who invented radio?and when it was discovered?

2007-08-14 14:30:04 · 3 answers · asked by clark v 1

How do they calculate the coefficent of friction, both static and kinetic?

2007-08-14 14:19:43 · 1 answers · asked by Anonymous

What size an object in space would have to be in order to have just enough gravity to hold a 200lb person to it's surface, yet so little gravity that one could jump clean off of it?
Is there a equation one could use to figure this out and what would this phenomenon be called?

2007-08-14 14:16:02 · 5 answers · asked by bender_xr217 7

2007-08-14 13:03:01 · 9 answers · asked by april b 1

2007-08-14 12:09:11 · 16 answers · asked by Anonymous

I know many will say its 9.8 m/s^2

but I'm talking about the true pull, for theres a negative acceleration caused by the spinning of the earth- so the actual value should be greater than 9.8 m/s^2

what is it?

2007-08-14 12:00:18 · 3 answers · asked by Flaming Pope 4

2007-08-14 11:25:43 · 10 answers · asked by jw 1

A pair of speakers separated by 0.700 m are driven by the same oscillator at a frequency of 681 Hz. An observer, originally positioned at one of the speakers, begins to walk along a line perpendicular to the line joining the speakers. (Assume the speed of sound is 345 m/s.)
(a) How far must the observer walk before reaching a relative maximum in intensity?
_______ m
(b) How far will the observer be from the speaker when the first relative minimum is detected in the intensity?
_______m

2007-08-14 11:12:25 · 1 answers · asked by Anonymous

our professor siad in the calss that its something
about relativity...

2007-08-14 10:27:25 · 6 answers · asked by Haale 1

2007-08-14 10:23:54 · 8 answers · asked by Ammy 6

2007-08-14 09:42:47 · 1 answers · asked by karthikeyan v 2

I was digging in the garden yesterday afternoon and hit a rock. I lifted the rock up and was just about to quietly drop it over my nextdoor neighbours fence when I noticed there was a thin strata running through it which was a completely different colour to anything I've ever seen. I don't just mean it was a different shade of a colour or a mix of a couple of colours, I mean it was a totally new colour. I'm going to phone up some paint factories and try an make some money out of this. What I'm wondering is can I patent this colour? I'm thinking of calling the colour jaklar.

2007-08-14 09:41:04 · 8 answers · asked by Anonymous

because it might soak up some water or something

2007-08-14 09:39:12 · 8 answers · asked by Anonymous

what frequency is affected by Doppler effect:
the frequency of sound, or the frequncy of pulses?

2007-08-14 08:46:33 · 4 answers · asked by Alexander 6

2007-08-14 08:35:27 · 31 answers · asked by Anonymous

I just watched a show that has to do w/ fourth dementions.

2007-08-14 08:09:47 · 13 answers · asked by Soul Patrol 1

I want to do an experiment that clearly proves that when you have a limited amount of a heat absorbing materiel (like water), that for the maximum cooling efficiency, it's better to wait before using it to cool the hot object or whatever it is. I did this little one yesterday:


I took two glass beakers with 200mL of 99C water in each. I added 40mL of 25C water to each at separate times. Here are the results:

A (Room temp water added at 1:00 min)
B (Room temp water added at 9:00 min)

Minute [ Temp A(C) / Temp B(C) ]

0 [ 99 / 99 ]
1 [ 87** / 95 ]
2 [ 85 / 91 ]
3 [ 83 / 88 ]
4 [ 81 / 86 ]
5 [ 79 / 84 ]
6 [ 78 / 82 ]
7 [ 77 / 80 ]
8 [ 76 / 79 ]
9 [ 75 / 70**]
10 [ 74 / 69 ]

**-room temp water added

I need help brainstorming ideas for a better test.

2007-08-14 08:04:44 · 3 answers · asked by Anonymous

2007-08-14 07:53:32 · 15 answers · asked by Prof Fruitcake 6

This transfer of electrons makes positive and negative charges which makes the ballon stick to the wall.
But usually when there is a transfer of electrons,Ionic compounds are formed.Why is it that some materials do not form ionic compounds and instead attain only the charges that keep them together for some time?

2007-08-14 07:35:23 · 3 answers · asked by Anonymous

take A note @ 440HZ and double its freq. ya get its octave. but where does this series physically stop? mathematically this doubling will occur indefinalty. but what happens to the physical soundwave when the same fundamental freq(our A 440) is increased to the Khz Mhz Ghz range? Does it stay a soundwave? or is there a max freq of soundwaves?

2007-08-14 07:31:32 · 8 answers · asked by Anonymous

2007-08-14 07:23:10 · 4 answers · asked by Anonymous

I don't want to sound arrogant or judgemental, but this is the physics section, right? Not "fantasy", or "paranormal", or "homework hotline", right? Perhaps there should be a homework help section (if there isn't already), and I know there is an "Alternative" section under Science and Mathematics. Wouldn't questions about photon torpedos and ghosts be more appropriate in that section? Just curious if anyone else who posts here feels this way. I like to come and view posts in the hopes of learning something - not finding out what kind of fabric Captain Kirk's underwear was made of...

2007-08-14 07:14:29 · 10 answers · asked by Anonymous

2007-08-14 06:58:01 · 4 answers · asked by Lighthouse 1

I recently visited Bogota located at 2,600 meters above sea level and after checking my weight in several scales I found that I weighed 10 pounds less than my normal weight. Is there a reason why that is so?

2007-08-14 06:46:23 · 8 answers · asked by Anonymous

the energetic throwing off of high energy xrays..is a photon boasted to a higher frequency? allowing it to escape the black hole.

2007-08-14 06:38:51 · 3 answers · asked by Joseph 2

We know to calculate the intensity emitted by a black body (total or inside a frequency interval) by Planck's formula. A realization of such is usually a cavity of constant temperature containing almost no matter.

But what do we do if we want to calculate the intensity emitted by matter? F.e. a box of hydrogen at constant temperature and are not fine with a black body approximation?

How could we get at least the intensities of the Hydrogene lines?

Thanks!

2007-08-14 06:30:45 · 3 answers · asked by Nick P 3

2007-08-14 06:07:29 · 14 answers · asked by Anonymous

Two trains move at right angle to each other, at equal speeds v1=v2=v. Pwo passenges, one on each train fire photonic blast guns in horizontal directions perpendicular to their tracks.
As it turns out both photonic blasts went in the same direction.

What is speed v?

2007-08-14 06:04:45 · 7 answers · asked by Alexander 6

Lets divide 2 liters of space into two interwoven regions of two equal volumes, and fill the regions with one liter of oil (ρ = 0.9g/ml) and one liter of water.

Force of buoyancy acting on water is equal to the weight of displaced oil, that is 0.9kg.
Force of buoyancy acting on oil is equal to the weight of displaced water, that is 1.0kg.
But according to 3rd law of Newton the two forces must be equal.

2007-08-14 05:28:17 · 6 answers · asked by Alexander 6