Physics - May 2007

2007-05-04 05:24:39 · 6 answers · asked by falalu 1

I observed the Zeeman effect in a "transverse" and "longitudinal" configuration with a polariser and quarter wave plate -but I can't work out which component is polarised in each case!

2007-05-04 04:33:18 · 4 answers · asked by KPL 1

Rapidly rotating puck (f = 25 revolutions per second) moves
along level carpet floor. Intial speed of the puck is V = 50 cm/s,
and its radius r = 4cm, friction is μ = 0.1.

*Estimate* how far will the puck move before it stops.

2007-05-04 04:26:40 · 4 answers · asked by Alexander 6

2007-05-04 04:24:59 · 16 answers · asked by Anonymous

2007-05-04 04:24:16 · 6 answers · asked by Anonymous

How would they percieve each other. The combined relative speed would be greater than the speed of light. Would they meet or pass each other before seeing each other?

2007-05-04 04:04:14 · 11 answers · asked by andy muso 6

2007-05-04 02:48:02 · 2 answers · asked by Ricnorast 1

My seems to think that a train is going faster in the front than it is going at the end.... and he even thinks that if you had 10 cars on the express way in a line ,and the front is doing 70 , the next one can only do 69, then next can only do 68 all the way down to car 10 can only do 60 ...would someone tell him all ten can do 70 together...PLEASE

2007-05-04 02:34:36 · 4 answers · asked by stephanie w 1

why does it glow ? yes I know because its very hot, but why does it give off light ?

2007-05-04 01:51:33 · 6 answers · asked by Anonymous

They're manufacturing it at CERN in Europe.... Do they sell it? How much does an atom of antihydrogen cost? I want one!

2007-05-04 01:48:21 · 11 answers · asked by Skepticat 6

I need to find some Celsius to Fahrenheit and vice versa problems please!!!

2007-05-04 01:47:25 · 1 answers · asked by lionesspurnell 2

Does it have to do something with conservation of energy or the principles of momentum(physics)?

2007-05-04 01:34:13 · 11 answers · asked by Brimu 3

Two turtles (each 3 kg) sit on an approximately massless branch in the water. They sit on opposite sides of the branch's center, each 3 m away.

The branch (10 m long) is spinning at 4 rad/s about its center (nearly without friction).

Now, if both turtles walk to the ends of the log, then the new angular speed of the log+turtles system would be:

rad/s

2007-05-04 00:56:35 · 3 answers · asked by Josh T 4

An ideal transformer connects a 120-V source to a 12-V, 1-A load. The secondary has 90 turns. Determine the following:

-A) Number of turns in the Primary

-B) Source Current

2007-05-04 00:48:53 · 5 answers · asked by ? 2

2007-05-04 00:12:26 · 6 answers · asked by lulu 3

2007-05-03 22:50:50 · 2 answers · asked by Albert 1

A 48 kg box is being pushed a distance of 7.0 m across the floor by a force whose magnitude is 155 N. The force is parallel to the displacement of the box. The coefficient of kinetic friction is 0.25. Determine the work done on the box by each of the four forces that act on the box. Be sure to include the proper plus or minus sign for the work done by each force.

applied force___1085____J
frictional force __________J
normal force ____0_____J
gravity ____0____J


I filled in the answers that I know already please help me find the "frictional force" Thank you

2007-05-03 22:02:13 · 4 answers · asked by Anonymous

all houses and electricity poles have this.

2007-05-03 21:59:21 · 5 answers · asked by dying2cu 1

I'm a physics major so if you could explain in a logical manner and include some proofs that would be helpful.

2007-05-03 21:49:25 · 4 answers · asked by Anonymous

According to the Joule effect, any current passing a conductor, creates heat. But it's also true that electric currents circulate better through a heated conductor..
soo.. that would trigger even a higher heatlevel in the conductor...
aand.. that would trigger a stronger current.. aand...well, you get the picture.
All this should happen very fast, so, basicaly every wire should burn out in 10-20 minutes. My question is, what stops that from happening. Oh, and It would be *great* if you could point me to a page that also explains it.
Thank you in advance.

2007-05-03 20:46:14 · 4 answers · asked by anarki 1

This is just me being curious...

If you were in your car going 70 MPH with the windows up, no air resistance and there was a lady bug sitting inside of your car in the back seat. In order for it to fly from the back seat of your car to the front seat would it have to fly faster then 70 MPH???

Now, I know that if it was something such as a grasshopper, and it was in the moving car and wanted to hop up front it would already be moving at the same speed as the car and would have the same initial velocity as the car, plus the additional velocity provided by its legs, and would make it to the front seat.

If the same is true for the lady bug then what is the difference between, the car scenario, and a lady bug flying down the high way at 70 MPH with a bubble around it??

At what point in flight would the lady bug loose the initial velocity gained by the movement of the car and get sucked to the back seat????
Can bugs fly 70 MPH? I don't know the answer, but we've all seen it happen.

2007-05-03 20:41:26 · 5 answers · asked by Anonymous

I should never type questions this late...lol...
So who thinks time is an infinitely large sea of points where each point represents an infinitely small instance in time and all events that have and ever will happen in the universe exist simultaneously in this large "sea of time"? Also, do you think it's possible that the world we live in now is maybe just a result of taking a certain path through these points? Just randomly wondering...

2007-05-03 19:17:33 · 12 answers · asked by Yuko 3

2007-05-03 18:48:00 · 7 answers · asked by Anonymous

There is a skier at the top of a ski slope. The skier has potential energy. What gives the skier his potential energy?

A. friction
B. gravity
C. his efficiency
D. his speed

2007-05-03 17:45:41 · 4 answers · asked by uhhannahh 1

Kinetic and potential energy applies only to non-living objects.


A. true B. false

2007-05-03 17:41:45 · 6 answers · asked by uhhannahh 1

The siren of a fire engine that is driving northward at 30.0m/s emits a sound of frequency 2000 Hz. A truck in front of this fire engine is moving northward at 20.0m/s.
a) What is the frequency of the siren's sound that the fire engine's driver hears reflected form the back of the truck?

b) What wavelength would this driver measure for these reflected sound waves?

2007-05-03 17:40:06 · 2 answers · asked by dude 1

What would a graph look like for wavelength vs frequency if the medium of a wave is kept constant?

Would it be a direct relationship or direct to a power?

2007-05-03 17:24:14 · 3 answers · asked by billf39 2

a. increases
b. decreases
c. stays the same

2007-05-03 16:49:31 · 3 answers · asked by tiffanyjdias 1

conductor could be increased by

a. decreasing the length of the conductor
b. dec. the applied voltage in the circuit
c. inc. the temperature of the conductor
d. inc. the cross-sectional arae of the conductor

2007-05-03 16:48:44 · 6 answers · asked by tiffanyjdias 1

potential difference of 2 * 10^2 volts. The amount of charge passing any point in the circuit in 2 seconds is

a. 1.26 x 10^19 C
b. 2 C
c. 2.52 x 10^19 C
d. 4 C

2007-05-03 16:47:15 · 2 answers · asked by tiffanyjdias 1