Physics - June 2007

2007-06-09 06:25:43 · 22 answers · asked by mick s 1

I don't understand how it is measured.

2007-06-09 05:12:44 · 9 answers · asked by Dovey 7

I don't want it's physics definition.

2007-06-09 05:09:21 · 5 answers · asked by JAIDEV S 1

I'm not sure i understand why exactly I know about the differnt types of radiation and their uses but why are the actually harmful or helpful?

2007-06-09 04:47:22 · 10 answers · asked by Anonymous

hi friends,
please clarify the reason for referring magnet's length as '2l', instead of usual 'l' in magnetism? please help friends

2007-06-09 04:46:49 · 2 answers · asked by aparna 1

In terms of radioctivity why is it more important to know about the half life of radioactivity?

2007-06-09 04:45:17 · 10 answers · asked by Anonymous

2007-06-09 04:36:13 · 9 answers · asked by Anonymous

A 205kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 30 degrees with respect to the horizontal. the coefficient of kinect friction between the log and the ramp is 0.900, and the log has an acceleration of 0.800 m/s^2. Find the tension of the rope.

I'm not sure how to work this problem..

2007-06-09 03:59:42 · 6 answers · asked by chly1459 1

2007-06-09 03:42:31 · 21 answers · asked by Anonymous

thanks to whosoever answers this question!!!!!!!!

2007-06-09 03:31:56 · 11 answers · asked by laserjohn 1

2007-06-09 03:21:29 · 6 answers · asked by Anonymous

Hello,

I need to solve one physics problem which is described below.

Here is the drawing which shows the situation:

http://img260.imageshack.us/my.php?image=monkeygn4.jpg

The disc is weightless. There is a rope which is rolled over the disc. A monkey is fastened at the point A. At the point B there is a body bound to rope. The mass of the monkey is equal to the mass of the body, so at the beginning the system is in balance. The monkey starts to move up the rope with speed v in respect of the rope. How will the body (which is bound at the point B) move while the monkey will be climbing up the rope?

I think that angular momentum conservation law should be used to solve this problem.

Thanks in advance.

2007-06-09 02:33:36 · 2 answers · asked by Pythagor 1

into a certain point depends.

2007-06-09 02:02:55 · 2 answers · asked by tut_einstein 2

I have read that the G constant from F=G(m1m2)/r2
was only measured after the death of Newton, by a public entertainer named Cavendish.

However !!! the lead balls used in Cavendish's experiment could have been charged wih electricity, and moved towards each other without the use of a "gravitational force"... one accidental contact can ponctually charge lead, which is a poor electricity conductor. It's electronegativity alone may even affect the two balls.

From there, could we simply have mistaken gravitation and magnetism? And how can we prove that the gravition law is real aside from testing it on the moon and on the earth? (with a hypothetical mass again for the earth and the moon).

Cavendish could have set a standard which is right for the moon and the earth (if we assume their estimated mass is exact too), yet not for other planets. Newton himself did not identify what causes gravitation. And Einstein only muttered about the curve of space and time. What about you?

2007-06-09 01:53:25 · 10 answers · asked by Roy Nicolas 5

2007-06-09 00:54:27 · 4 answers · asked by Gita 3

2007-06-09 00:31:27 · 4 answers · asked by Anonymous

2007-06-08 23:43:23 · 7 answers · asked by Anonymous

Hello,

I need to solve physics problem which is described below.

There is a gun which mass is M = 4 kg. The length of the gun's barrel is l = 50 cm. I need to find the average kick force while shooting the bullet which mass is m = 5g. The speed of bullet when it leaves the gun's barrel is v = 930 m/s.

Thanks in advance.

2007-06-08 23:25:53 · 2 answers · asked by Pythagor 1

2007-06-08 23:23:36 · 2 answers · asked by Anonymous

Is the head of pressure (the distance from Mercury in tube to the level of mercury in bowl) taken for atmospheric pressure or the whole lentgh of mercury column(below the mercury in bowl) is taken for measurement? If u have any doubt about question inform it through answer i will email the proper question to u

2007-06-08 22:15:54 · 6 answers · asked by Angry dude 2

2007-06-08 21:53:58 · 1 answers · asked by Anonymous

use illustrations in your answers please

2007-06-08 21:00:39 · 10 answers · asked by adrose2001@btinternet.com 3

please give knowledgable scientific answers only with refferences.

2007-06-08 20:08:07 · 6 answers · asked by ihavepeaceofmind 1

What is the difference between phase velocity and group velocity?
Does this ideas apply to all types of waves or for specific waves?
What makes the group velocity faster than the speed of light (I already know the derivation but i was thinking what are the possible reasons why this phenomena always happen)?

2007-06-08 19:45:24 · 3 answers · asked by Anonymous

I am a XII standard student. I want ot become a physicist. So, I am searching for good colleges/universities which provide good courses in physics(pure and applied), and/or theoretical physics.
Please help.

2007-06-08 19:37:44 · 5 answers · asked by Rainbow 1

Okay, I'm pretty sure this applies to some most of the three categories listed in the bit above.

Are there different dimensions, as in spatial dimensions and chonological dimensions? By this I mean the first dimension of space is basically a straight line, just going forward without end. We go through time in a similar way, going forward without end. However, in spatial dimensions, we can go sideways, and up and down. Are chronological dimensions similar? If they are, if we traveled 'sideways' through time, wouldn't we arrive in a different world at the same time ( also the same year and everything) we left the one before?

2007-06-08 19:14:00 · 12 answers · asked by The Doctor 2

2007-06-08 17:22:47 · 4 answers · asked by Anonymous

Since an object with mass accelerated to lightspeed would have infinite energy; if you launched a nuclear missile to lightspeed and detonated it, would the entire universe be destroyed.

Even though accelerating objects to lightspeed is currently impossible, suppose accelerating to 99.999% lightspeed, would that cause almost complete destruction of the universe?

2007-06-08 16:09:43 · 8 answers · asked by Fancy Mc Pants 1

a skier on a slope inclined at 4.7 degrees to the horizontal pushes on ski poles and starts down the slope. The initial speed is 2.7 m/s. The coefficient of kinetic friction between skis and snow is 0.11. Determine how far the skier will slide before coming to rest.

2007-06-08 16:05:47 · 3 answers · asked by Malvern100 1

I know what it states, I want to know why that happens thought.

2007-06-08 15:40:52 · 7 answers · asked by symperl 2