Physics - March 2007

whrn it is cold out side the sun should not come out side becaues it just should not?

2007-03-17 06:34:07 · 9 answers · asked by blahhh 1

2007-03-17 06:23:09 · 21 answers · asked by bavwill 3

2007-03-17 06:22:57 · 3 answers · asked by angel 1

After the box is closed, the cat is said to be in a state of superposition of |dead> and |alive>. Now the person carrying out the experimnt peep into the box and find that the cat is alive. So, it is said that the act of looking causes the wavefunction of the cat to collapse and, in this case, it collapse to the |alive> state. When the box is closed again, the wave function of the cat starts to smear out and after a while one would say the cat is back to the superposition state of |dead> and |alive> again. Intuitively, this cycle can be repeated over and over again as long as the cat is still alive.

Now, if the person peep into the box and saw the cat dead. It is said that the act of looking caused the state of the cat to collapse to the |dead> state. But if the box is closed back, can one say that the cat is back to the state of |dead> and |alive>? If so, could it be possible that the next time someone peep into the box, the cat is back alive? If not, why is the there an asymmetry?

2007-03-17 06:17:17 · 6 answers · asked by sh 1

If an object with momentum mv were to collide with a stationary object of mass m, it would apply a force F.

What equations link momentum and force?

2007-03-17 06:08:35 · 6 answers · asked by kirdish 2

The sound of a band is rated as 50 dB at a distance of 30.0 m. What is the dB sound level of the band when one is 10.0 m from the band??

please help me, thanks!!

2007-03-17 05:58:06 · 1 answers · asked by Anonymous

2007-03-17 05:57:49 · 2 answers · asked by Anonymous

There are three spacial dimentions we know about, and 6 or 7 more "hidden" spacial dimentions acccording to string/M theory.

So, why are we limited to only one time dimention? Could there be more than one time dimention?

2007-03-17 05:45:02 · 7 answers · asked by Anonymous

2007-03-17 05:39:21 · 2 answers · asked by Lance Goodie 1

r1=5 ohms
r3=15 ohms
compared to heat developed in resistor r1 the heat developed in r3 is
one third as great
two thirds as great
3 times as great
one forth as great

2007-03-17 05:33:52 · 3 answers · asked by Anonymous

A cylinder of mass 'm' and radius 'r' is rolling witout slipping on a horizontal surface.Find total angular momentum about a point 'p' at a distance 'r/2'above the center.

2007-03-17 05:16:41 · 2 answers · asked by Anvesh B 1

A car with mass 1.36 x 10^3 kg starts at rest and accelerates to 10.5 m/s in 13.5 seconds. The force of resistance remains constant at 410 N. What is the average power developed by the cars engine? In units of W.

2007-03-17 05:13:22 · 2 answers · asked by sotkinghunter 1

I mean are they something like electrons, protons etc.. Or are they vibrations?

2007-03-17 05:08:24 · 11 answers · asked by neutreno 3000 2

A woman and a man are on separate rockets, which are flying parallel to each other and have a relative speed of 0.900c. The woman measures the same value for the length of her own rocket and for the length of the man's rocket. What is the ratio of the value that the man measures for the length of his own rocket to the value he measures for the length of the woman's rocket?


his rocket / woman's rocket =

2007-03-17 05:03:03 · 2 answers · asked by marinatedpickles 2

A tourist walking at a speed of 1.5 m/s along a 7.5 km path that follows an old canal. If the speed of light in a vacuum were 3.0 m/s, how long would the path be, according to the tourist?

2007-03-17 05:01:49 · 2 answers · asked by marinatedpickles 2

A particle lives for a short time before breaking apart into other particles. Suppose it is moving at a speed of 0.988c, and an observer who is stationary in a laboratory measures the particle's lifetime to be 2.50 10-8 s.
(a) What is the lifetime according to a hypothetical person who is riding along with the particle?
s

(b) According to this hypothetical person, how far does the laboratory move before the particle breaks apart?
m

2007-03-17 05:00:32 · 1 answers · asked by marinatedpickles 2

Is our furture already set? The predictions seem to be largley about bad tragic things tha happen. Plane crash, war, end of world. Could this be because of the loss of life itself some how cause a change to the time stream.

2007-03-17 04:51:09 · 9 answers · asked by alone 2

2007-03-17 04:21:03 · 10 answers · asked by alanone88 1

2007-03-17 04:18:20 · 2 answers · asked by Anonymous

2007-03-17 04:10:40 · 4 answers · asked by Anonymous

There are charges arranged in a regular hexagon. The top three are positively charged, and going from left to right, have charges of 1uC, 2uC, and 3uC. The 3 bottom ones of the hexagon have charges going from left to right of 4uC, 5uC, and 6uC. Calculate the net electric field on a negative test charge placed at the left bottom-most corner (where the 6uC charge is at).

2007-03-17 04:00:56 · 1 answers · asked by Jay Z 1

a sound wave radiates from a source in all directions. If the power of the osund source is 200 watts, then the intensity level of the sound wave 100 m from the source is, in dB??

please help, thanks!!

2007-03-17 03:55:23 · 1 answers · asked by Anonymous

The sound of a jet engine is given as 120 dB. What is the intesity of the jet sound wave??

please help, thanks!

2007-03-17 03:48:18 · 2 answers · asked by Anonymous

2007-03-17 03:11:30 · 1 answers · asked by selim d 1

On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a 6 iron. The acceleration due to gravity on the moon is 1/6 of its value on earth. Suppose he hits the ball with a speed of 30.0 m/s at an angle 60.0 degrees above the horizontal.


How much farther did the ball travel on the moon than it would have on earth?


For how much more time was the ball in flight?

2007-03-17 03:03:55 · 2 answers · asked by RelientKayers 4

You are watching an archery tournament when you start wondering how fast an arrow is shot from the bow. Remembering your physics, you ask one of the archers to shoot an arrow parallel to the ground. You find the arrow stuck in the ground 61.0 m away, making a 2.00 degree angle with the ground.

2007-03-17 03:02:55 · 1 answers · asked by RelientKayers 4

2007-03-17 02:56:51 · 7 answers · asked by Anonymous

With reference to my previous question:
"A 50cm silver bar becomes shorter by 1mm when cooled.How much was it cooled? coeff. of linear expn=.000018/c.
This problem was solved taking L=50cm.
My question is how can L=50cm?Should it not be the final lengthand the original length=50-.1=49.9? Since it is a question of expansion and not contraction."

Suppose a silver bar which was originally 50cm long expanded to 50.1cm and the temperature difference is 111.11deg celsius, value of alpha would be calculate as .000018.
But suppose we are given the data as follows: A silver bar 50.1 cm long reduces to 50 cm when cooled through a temperature difference of 111.11 deg celsius we get alpha as
.0000179.
So should we not take the initial length as the one at the lower temperature?

2007-03-17 02:56:40 · 1 answers · asked by flowering_flower1 1

2007-03-17 02:48:17 · 10 answers · asked by Lorenzo de' Medici 1

2007-03-17 02:26:20 · 12 answers · asked by chandra s 1