Physics - January 2007

Which isotopes are produces when an atomic bomb explodes? How long will they be dangerous?

2007-01-09 05:48:17 · 8 answers · asked by mel c 1

2007-01-09 05:46:13 · 3 answers · asked by mel c 1

2007-01-09 05:29:45 · 8 answers · asked by Anonymous

how do I derive these equations into formulas for velocity, period, and radius of orbit for an object?
F=GMm/d^2, F=mv^2/r (centripetal) where v=2(3.14)r/T

2007-01-09 05:27:29 · 7 answers · asked by indrul1 3

2007-01-09 05:26:04 · 10 answers · asked by skjoldvarr 1

what is the basic problem in relativity ´theory or quantom theory, that we should find another BIGGER theory than those ?

2007-01-09 05:16:42 · 4 answers · asked by ahmad asali 1

2007-01-09 05:10:28 · 6 answers · asked by dev 2

1-can a quantity have constant value and be dimensionless?

2-convert a power of one mega watt on a system whose fundamental units are 10kg,1dm and i minute.

3-the height of mercury column in a barometer in a calcutta laboratory was recorded to be 75cm.calculate this pressure in SI and c.g.s units using the following data:specific gravity of mercury=13.6,density of water-1000kg/m^3,g=9.8m/sec^2 at calcutta.pressure=h rho g in usual symbols?

4-the dimensions of sigma b^4 (where sigma is stefan's constant and b is wien's consatnt) are [ml^4t^-3].is it true?

5-the velocity v of a particle depends upon time t,according to the equation v=a+bt+c/d+t.write the dimension of a,b,c and d.

6-dimension of young modulus?

7-calculate the dimensions of linear momentum and surafce tension in terms of velocity v,density rho,and frequency as fundamental units.

8-find the value of 60 joule/min on a system which has 100 g,100cm and i min as fundamental units.

2007-01-09 04:32:01 · 5 answers · asked by smile 1

what is photonic band gap in photonic crystal fiber

2007-01-09 04:30:26 · 3 answers · asked by athisesan 1

2007-01-09 04:17:58 · 4 answers · asked by kristina p 1

please help!

2007-01-09 04:00:57 · 7 answers · asked by kristina p 1

plz mention rays other than x rays and ultra sounds

2007-01-09 03:11:01 · 9 answers · asked by sam 1

2007-01-09 02:54:11 · 3 answers · asked by Anonymous

2007-01-09 02:50:57 · 11 answers · asked by ndlovu55 1

A kite, 60 m above the ground, is moving horizontally at the rate of 5m/s. At what rate is the inclination of the string to the horizontal diminishing when 120 m of the string are paid out?

2007-01-09 02:42:01 · 3 answers · asked by Anonymous

2007-01-09 02:32:16 · 6 answers · asked by Akshay 1

Suppose i have a source of electro-magnetic waves. What happens to the environment around that source that makes the wave travel? Do the points around the source start to oscilate and what is the connection of the sinusoidal graphics of say the electric intensity of the field and the matter around the source. Is it correct to asume that at a certain moment each point is on a such sinusoide? I mean do points arounde the source move up an down in a sinusoidal manner, just like water does when you drop a rock? If not, then how on earth and what makes an electro-magnetic wave travel from A to B?

2007-01-09 02:24:13 · 4 answers · asked by Sticky 2

How much of a beam of randomly polarized light will pass through a pair of polarizers set at a45 degree angle between the two?

2007-01-09 02:21:53 · 2 answers · asked by kid_A 2

A toilet flush is operated by the compression of air. The air inside the flush has a pressure of 1.0 x 10^5 Pa and a volume of 150 cm^3. When the flush is operated the volume is reduced to 50 cm^3. The temperature of the air remains constant during this process. Calculate the new pressure of the air inside the flush.

2007-01-09 02:21:26 · 2 answers · asked by ♥♥♥shico♥♥♥ 2

2007-01-09 01:53:39 · 1 answers · asked by ora_dutt 1

2007-01-09 01:16:50 · 6 answers · asked by Anonymous

2007-01-09 01:13:59 · 20 answers · asked by Anonymous

given that
a= 16
b = 18
A = 60 degrees

Im trying to find out if there is one, two, or no triangles ..Thanks for any input..

2007-01-09 01:05:07 · 1 answers · asked by Matthew B 2

Determine the area of the triangle. Given that...
a = 14
b = 4
c = 12

2007-01-09 00:59:12 · 2 answers · asked by Matthew B 2

2007-01-08 23:37:01 · 6 answers · asked by bey 1

2007-01-08 23:07:22 · 2 answers · asked by edward b 1

Where can I get some labeled diagrams of the two instruments?

What are also the steps in using each of them in determining the specific gravity of certain liquids?

2007-01-08 22:18:53 · 3 answers · asked by Anonymous

i know that sound travels in water,then when i clap underwater why dont i be able to hear it when i am above the water.

2007-01-08 22:02:15 · 14 answers · asked by Anonymous

during the day time we can here when its far away,,, but during night its not so?

2007-01-08 21:45:47 · 6 answers · asked by chandra sekaran.p 2

When your car travels straight ahead and turns to either left or right, it needed centripetal force, right? Or else it would have gone straight no matter what. Where does this force come from--centripetal force?

2007-01-08 21:24:30 · 3 answers · asked by inthemaking 2