Physics - March 2007

2007-03-14 01:54:41 · 6 answers · asked by andrea april a 1

...and can you be agnostic about both? "Clusters of galaxies would fly apart unless they were held together by gravitational attraction. The mass required is considerably greater than the mass of all the galaxies… It follows therefore that there must be extra dark matter present in clusters of galaxies outside of the galaxies we see" Stephen Hawking.

Why does it follow?

Why must there be something else which we can not identify to make a theory valid? Could it not be something is missing from the theory rather than an "mysterious" substance that essentially requires belief in the same way that people believe in a God?....by the way any people championing a particular religion in an answer will not be considered for points ;)

2007-03-14 01:28:06 · 11 answers · asked by Bumsworth 1

help me!

2007-03-14 01:27:38 · 5 answers · asked by kuwee 2

what is the temperature of the steam if the water boils at 96 degrees?

2007-03-14 01:25:52 · 6 answers · asked by kuwee 2

Explain in terms of kinetic and thermal energy. describe why the nail head gets warm.

2007-03-14 01:25:13 · 3 answers · asked by Anonymous

2007-03-14 01:21:26 · 1 answers · asked by Richard Z 1

2007-03-14 01:18:52 · 6 answers · asked by andrea april a 1

is the speed of a shadow appearing on a surface as fast as the speed of light????

2007-03-14 01:14:38 · 2 answers · asked by askheems 1

alone nor cold. should you add the cream now, or by the time your date comes?

2007-03-14 01:05:07 · 5 answers · asked by andrea april a 1

2007-03-14 00:18:01 · 6 answers · asked by Rahul 3

I only know that 0 degrees Kelvin is equavalent to -237.15 degrees celcius...

2007-03-14 00:15:06 · 20 answers · asked by Resha Valentine 2

slows down to 11 in 3 secs what is bird's velocity after an additional 4s has lapsed

2007-03-13 23:57:18 · 1 answers · asked by man 1

slowing the accelatation to -6.10 how fast the racer moving 3.50*10^2 after parachute opens? thankx

2007-03-13 23:45:57 · 2 answers · asked by hope 1

Im totally stuck on my physics c/w we have to work out the resitivity of graphite. First we did a preliminary which is where we measured both the voltage and current of pencil lead, we did it 3 times to get averages then we worked out the resistance, we made a graph of the length and resistance which incorparated zero errors and then we were asked the find the gradient of it, but i have no idea how to work out the gradient of this graph and my teacher is no help. Please can someone help me!

2007-03-13 23:31:36 · 1 answers · asked by Mark 2

2007-03-13 23:24:06 · 1 answers · asked by Anonymous

How would you compute the avg. kinetic energy of an O2 molecule at 25°C?
Using this info, how would you calculate the avg. velocity of a Hydrogen molecule also at 25°C ?

2007-03-13 23:10:34 · 2 answers · asked by San Fran Kid 2

this refers to 'electron conduction'

2007-03-13 22:54:09 · 1 answers · asked by swathi 1

name of type of rechargable cell.

2007-03-13 22:42:25 · 11 answers · asked by jaya 2

2007-03-13 22:41:33 · 4 answers · asked by fAtiN hAsEgAwA 1

if I got a ball bearing the size of a tennis ball and used some special cannon capable of pushing an object to the speed of light..and I fired it at the safe door(the solid steel heavy kind)

would it explode like a nuclear bomb, or would the ball just melt at half the speed of light

2007-03-13 22:30:22 · 5 answers · asked by mrbragg2k 3

...and convert it into usable form - like electricity? If this has already been done, how much energy is there in an average person's day?

2007-03-13 22:25:18 · 8 answers · asked by Nadine - Unity CEO 3

2007-03-13 22:17:44 · 9 answers · asked by rosie_xo01 1

2007-03-13 21:13:51 · 5 answers · asked by fAtiN hAsEgAwA 1

Calculate the de Broglie wavelength of the electrons?

The equation is wavelength= plancks constant / momentum.

I am having a hard time finding the momentum with power given. Can someone help me?

2007-03-13 21:05:22 · 1 answers · asked by PhyzicsOfHockey 2

2007-03-13 20:44:42 · 8 answers · asked by fAtiN hAsEgAwA 1

2007-03-13 20:44:32 · 4 answers · asked by Anonymous

2007-03-13 20:41:41 · 1 answers · asked by fAtiN hAsEgAwA 1

2. How is an ultrasound associated with both sound and light?

3. Related to particles, why does a tuning fork make a louder sound when touching a table versus being held in the air when struck?

4. A piece of cloth appears red under red light, green light, and blue light. What color is the cloth? Explain why it cannnot be any other color.

2007-03-13 20:41:07 · 1 answers · asked by Anonymous

so I was watching the TV and I think it was national geographic channel. They did a special on black holes...the whole thing got me thinking...in science, it is a general maxim that you cannot make something from nothing.

Scientists think they have a connection between the birth of galaxies and black holes, that the former springs from the latter at it's early stages of life.

If this were true...then where did the black hole and gasses surrounding itcome from? I mean you keep going back in time, and back in time...was there every NOTHING in the universe? If so where did the first particle come from?

I am agnostic, but this questions sometimes makes me wonder if there is or was a supreme creator of some kind.

What do you think?

I am looking for more scientific based answers, I don't need to hear..."God created it" remember I am agnostic :-)

2007-03-13 19:57:20 · 8 answers · asked by CBJ 4

2007-03-13 19:55:06 · 4 answers · asked by Tanvi Sawal 1