Physics - May 2007

2007-05-03 03:23:47 · 1 answers · asked by peterphillips.php@btinternet.com 1

2007-05-03 02:35:52 · 7 answers · asked by Anonymous

a. amplitude
b. wavelength
c. polarization
d. frequency

2007-05-03 02:19:41 · 10 answers · asked by HMMMMM 1

2007-05-03 01:36:29 · 8 answers · asked by BOND_BOND2001 3

I have this small problem with my television.

In science today my teacher waved a magnet in front of the TV and made the picture waver. Stupidly, when i got home i thought it would be a good idea to try the same thing with my television.

I now have a rather large (enormous, actually) green patch in the middle of my TV. My question is; Will this receed over time, and if so, how long will it take?

I have turned the television off, but i think my dad wil turn it on when he gets up, around 7, so thats in like 10 hours. How noticable will it be then, cause i haven't told him?

The magnet wasn't one of those super-strong ones, but it was pretty strong. One half of those clicking magnetic round things, if anyone knows what they are.

2007-05-03 00:47:52 · 5 answers · asked by Anonymous

2007-05-03 00:21:30 · 7 answers · asked by PINAR W 1

2007-05-03 00:00:41 · 8 answers · asked by sweety 1

i have figure out something.I have a table lamp with 20W and provided 12V. It release a massive heat that i wet a tissue papaer put on top on it , and the wet tissue paper start to evaporate the water.What if i change the lens into something like Convex lens will it burn a paper?

2007-05-02 23:37:12 · 1 answers · asked by munak991 2

They must have used all the equipments of the 20th century, by which, the answer for such a small constant must have come as good as zero? So how was it done ?

2007-05-02 23:10:17 · 1 answers · asked by Rohit S 2

A voltmeter is to measure voltage without affecting current, so with an infinite resistance, no current will flow through it.

So now current is not affected…but then since current does not flow through it, how is the voltmeter still able to detect and measure the voltage WITHOUT any current flow??

And since it’s resistance is so high, once the voltage comes into contact with it to be measured, wouldn’t A LOT of voltage be used up instead due to the high resistance? So in the end affecting the voltage by lowering it by a lot?

Please tell me if my concept is wrong!!

2007-05-02 22:42:59 · 5 answers · asked by Anonymous

2007-05-02 22:21:54 · 10 answers · asked by Anonymous

Light travels in space - It is bound by our laws as it is affected by gravity. Matter is also made out of energy.. my gut feeling is that it is made from the same stuff light is made out of (Drum roll.... E=Mc^2+(P^2)*(c^2)) .. We know that as matter goes towards c, it suddenly increases in mass (gamma in the lorentz transformation equations goes to infinity). This basically tells us light is the fastest thing which moves in our space-time. I know in the Milikan experiment it was ruled out that the ether existed.. but could there be a possibility we can "lift" matter or light into a "hyperspace" and make it go faster. Think of it like a boat in water.. it can only go so fast.. but as soon as you give it wings and it lifts from the water (in our case, space-time) all of the sudden the boat can go faster. We just can't detect it because it is not in our reality. What I am saying here would be considered heresy in a college setting. Let me know your thoughts and your pros and cons.

2007-05-02 21:39:04 · 2 answers · asked by Sex Crazed 1

(a)0 degree C
(b) pressure
(c)in atmosphere
(d) 0 viscosity

2007-05-02 20:11:15 · 6 answers · asked by Anonymous

Please share your equations and/or sources.

2007-05-02 20:05:56 · 5 answers · asked by sww_35 2

2007-05-02 19:15:53 · 1 answers · asked by Anonymous

"the big bang" and" space is infinite"they conflict.

2007-05-02 18:55:12 · 6 answers · asked by Anonymous

2007-05-02 18:09:11 · 12 answers · asked by Shivam verma 1

2007-05-02 18:07:21 · 10 answers · asked by Shivam verma 1

2007-05-02 17:33:42 · 4 answers · asked by Adnan Shahid Afridi 1

The batteries in a portable CD player are recharged by a unit that plugs into a wall socket. Inside the unit is a step-down transformer with a turns ratio of 1:12. The wall socket provides 115 V. What voltage does the secondary coil of the transformer provide?

2007-05-02 17:33:35 · 2 answers · asked by Alan l 1

An object no matter the mass is which fall from the same height will take the same time to reach the ground (Galileo's Pisa Experiment).

If the height of WTC is 526.3 meters and the gravity constant is 9.8 m/s^2 then the time needed by the roof top to reach the ground is given by:

h=1/2*g*t^2
t=sqrt(2*h/g)
=sqrt(2*526.3/9.8)
=sqrt(107.4081633)
=10.36379097 second

but why in the video recording it took only 9.5 seconds. It is so odd isn't it?

2007-05-02 17:15:38 · 9 answers · asked by Anonymous

A farmer in a tractor accidentally touches a live power line with a metal arm on the tractor used to move hay bales, but she does not get a shock. Explain why the farmer is not electrocuted. Explain what she should do next to avoid electrocution.

2007-05-02 16:33:36 · 7 answers · asked by Anonymous

Can you please help me with these? Book doesn't help much.

1) http://img172.imageshack.us/img172/9498/3068og0.jpg
What is the C_eq of the 6 capacitors?
What is the potential diff between A and B?
** tried adding up the middle set of capacitors (series then parallel) first then the outside ones (parallel). Wrong. Answer is supposed to be 3C/2. How is E=0?

2) http://img172.imageshack.us/img172/5199/3112jf5.jpg
What is potential difference at the 10 ohm resistor? at 20 ohm?
**Tried V=IR, I=2, then V_10=2*10=20. This is wrong. Don't know why.

3) http://img172.imageshack.us/my.php?image=3150nu2.jpg
What is the value of the resistance R?
What is power dissipated by R?
**Tried I=sum (batteries) /sum(R), then V_R=IR =6, this is wrong. Need this to find power.

4) http://img172.imageshack.us/img172/443/3168vf3.jpg
The current and potential difference at 3 ohm?
**Tried adding sides to make series. V=12, R=71, I=1. Somehow wrong.

2007-05-02 16:27:06 · 2 answers · asked by Anonymous

In the arrangement shown in Figure P14.40, an object of mass, m = 1.0 kg, hangs from a cord around a light pulley. The length of the cord between point P and the pulley is L = 2.0m
http://www.webassign.net/sf/p14_40.gif

(a) When the vibrator is set to a frequency of 175 Hz, a standing wave with six loops is formed. What must be the linear mass density of the cord?
_______kg/m

(b) How many loops (if any) will result if m is changed to 2.25 kg?
________ loops

(c) How many loops (if any) will result if m is changed to 9.00 kg?
________ loops

2007-05-02 16:17:24 · 2 answers · asked by Emma 1

An outside loudspeaker (considered a small source) emits sound waves with a power output of 120 W.
(a) Find the intensity 10.5 m from the source.
_________ W/m2
(b) Find the intensity level in decibels at that distance.
_________dB
(c) At what distance would you experience the sound at the threshold of pain, 120 dB?
__________ m

2007-05-02 16:10:29 · 2 answers · asked by Emma 1

An electrician performing a repair on an electric fence first turns off the power. As an extra precaution, he touches the fence with the back of his hand before beginning repairs. Why does he use the back of his hand?

2007-05-02 16:07:55 · 6 answers · asked by Anonymous

Just one tricky problem I can't seem to figure out:

A transverse wave is traveling on a string. The displacement y of a particle from its equilibrium position is given by y = (0.021 m)sin(29t - 2x). Note that the phase angle (29t - 2.0x) is in radians, t is in seconds, and x is in meters. The linear density of the string is 1.4x10^-2 kg/m. What is the tension in the string?

Thanks for any help!

2007-05-02 15:47:48 · 1 answers · asked by accciobrain 2

In other words, can gravity propagate instantaneously, or does it travel at or close to c, the speed of light? If it's faster than c, then Einstein was wrong. But the only way it can even reach c is if it's a form of electromagnetic radiation--which most scientists believe it's not. So... is gravity <, > or = c??

2007-05-02 15:34:48 · 8 answers · asked by Anonymous

answer should be in g
here is the equation:
C2H6(g) + O2(g) CO2(g) + H2O(g) (unbalanced)

2007-05-02 15:10:36 · 2 answers · asked by Nikki L 1

Whats diffrent than just two blackholes colliding, and would it affect the event horizon, And does a black hole have a center of mass?

2007-05-02 15:00:48 · 5 answers · asked by Michael 3