Physics - March 2007

Rest assured, this is not my homework.

2007-03-06 12:42:03 · 5 answers · asked by Dovey 7

a. spontaneous emission of a photon
b. induced emission of a photon
c. absorption of a photon
d. a collision with another atom

2007-03-06 12:38:45 · 5 answers · asked by Anonymous

A charged particle moves through a region of space at constant velocity. Ignore gravity. In the region, is it possible that there is a magnetic field but no electric field, an electric field but no magnetic field, and a magnetic field and an electric field? What is true about the directions of the fields?

2007-03-06 12:36:38 · 1 answers · asked by Sir Guitarist 2

please answer ryt now...tnx

2007-03-06 12:36:29 · 17 answers · asked by Anonymous

a. are called photons
b. have random energies
c. have energies that depend upon the intensity of the light
d. have energies that depend upon the frequency of the light

2007-03-06 12:34:10 · 2 answers · asked by Anonymous

a. less than the total mass of its constituent nucleons
b. the same as the total mass of its constituent nucleons
c. more than the total mass of its constituent nucleons
d. any of the above, depending on the nucleus

2007-03-06 12:33:01 · 3 answers · asked by Anonymous

A small ball of mass m is aligned above a larger ball of mass M = 0.77 kg (with a slight separation, as with the baseball and basketball), and the two are dropped simultaneously from height h = 2.1 m. (Assume the radius of each ball is negligible relative to h.)



(a) If the larger ball rebounds elastically from the floor and then the small ball rebounds elastically from the larger ball, what value of m results in the larger ball stopping when it collides with the small ball?
kg
(b) What is the maximum height the small ball then reaches?
m

2007-03-06 12:32:31 · 2 answers · asked by x2carlosp 2

2007-03-06 12:28:16 · 17 answers · asked by WereWolf 1

Why is it so unusual & cannot be integrated into any universal unifying theories at present?

2007-03-06 12:20:59 · 4 answers · asked by Anonymous

I did a lab for my science class and what we did was we had an eyedropper and we slowly droped drops of water onto the penny until it would fall over, and see how many drops it took. Some people got up to 45! I know it has something to do with surface tension, molecular attraction and capillarity. I dont really understand these words either! I need to have them explained in laymens terms! If you have any part of this please help! thanks : )

2007-03-06 12:20:39 · 6 answers · asked by Anonymous

2007-03-06 12:19:46 · 8 answers · asked by Dovey 7

i need it for science cuz i have no idea

2007-03-06 12:15:14 · 3 answers · asked by titany_101 1

2007-03-06 11:55:08 · 4 answers · asked by Dovey 7

the earth's orbit around the sun is very cirular, with an average radius of 1.5 x 10^8km. Assume the mass of hte earth is is 6 x 10^ 24 kg

2007-03-06 11:54:28 · 4 answers · asked by a cool person 3

I need to know how to make an object that will rotate uphill with no force applied to it. It needs to be really creative and not the obvious....describe in detail please, because i already know the basics....

2007-03-06 11:33:52 · 1 answers · asked by michellaneous413 2

A ball of mass 5.0 kg with a velocity of 8.0 m/s [E] collides head on with another moving ball with mass 4.0 kg. The collision lasts 0.1 s and the 5.0 kg ball rebounded with a velocity of 5.0 m/s [W]. The 4.0 kg ball rebounded with a velocity of 4.0 m/s [E]. Calculate the velocity of the 4.0 kg ball before the collision.

Please help; I'd really appreciate it. I got some random answer of 12.25 m/s when I tried to do it but honestly, I... don't know what I'm doing.

Thanks! :)

2007-03-06 10:52:01 · 1 answers · asked by Ariel 2

how many electron will a neutral atom of carbon have if the carbon nucleus has 6 protons and 8 neutrons
6
2
8
14

2007-03-06 10:44:04 · 1 answers · asked by jjiuk u 1

so you got wieght of climber @ 185 lbs falling from a height of 16 ft
with a attachment point @ 8 ft (this is where the rope is attached )
here's the senerio i'm 8 ft above the attachment point with 8 ft of rope played out which mena i'll fall the 8 ft to the attachment point and then proceed to fall another 8ft un till the rope becomes tuant on the attachment and let's also assume that the rope has infinte strenght and ridgity when i come to a stop and start the penglim effect towards the wall how fast will i be traveling and how much force is exerted on to my body?

2007-03-06 10:42:29 · 1 answers · asked by Anonymous

consider that a chain made of oval shaped identical metal rings is hanging vertically(perpendicular} 2 the surface of a floor..

now consider theres no air resistance ..no atmosphere at all..
the length of the chain is taken as x metres ....
now assume theres no influence of gravity on the chain beyond a particular point B WHICH is above the floor.
now take acc due to grav as 10m/s/s..one end of the chain is just touchin the floor which is taken as point A..NOW thers influence of gravity on the chain only between point A and point B. BEYOND that thers no field at all (jus imagine kkk). if x is taken as say 200metres..and ab is 10 metres .

i need the equation which can used to calculate the velocity with which the chain ill b movin at any point of time t..

2007-03-06 10:41:39 · 3 answers · asked by mikel 2

2007-03-06 10:34:16 · 3 answers · asked by Roxi Babay 1

2007-03-06 10:24:04 · 4 answers · asked by Roxi Babay 1

For example, calculate the change in entropy in metling 1 kg of ice from 173K to 273K. (Specific heat: 2.05)

2007-03-06 10:16:30 · 3 answers · asked by disoneguy300 3

Two plane mirrors are separated by 120°, as the drawing illustrates. If a ray strikes mirror M1 at a theta1 = 57° angle of incidence, at what angle theta2 does it leave mirror M2?

http://www.webassign.net/CJ/25_01alt.gif

I understand that 57 degrees will become the angle of reflection and that the lower angle is 33 degrees after this I am confused as to what happens. Any help is appreciated. Thanks!

2007-03-06 10:13:44 · 2 answers · asked by scarletandgray07 1

after two nuetral solids a and be were rubbed together.A acquired a negative net charge.solid b herefore experience a net

increase of proton
loss of electron
loss of proton'
increase in electron

2007-03-06 10:07:05 · 6 answers · asked by jjiuk u 1

Do the radio waves get changed in any way when passing through the electric fields?

2007-03-06 10:03:10 · 5 answers · asked by Ejsenstejn 2

All the details can be found here: http://i24.photobucket.com/albums/c32/CMcraz23/img031.jpg

Thank you very much

2007-03-06 10:02:52 · 1 answers · asked by Mike 2

2007-03-06 10:00:30 · 5 answers · asked by Tim B 1

2007-03-06 09:45:35 · 1 answers · asked by damigurl05 1

in 1992 maurizo domiliano walked 29752 m in 2.00h ,
a ) wats his average speed in m/s? ,
b ) supose he slows down to 3.00m/s at midpont of journey , but then picks up pace and accelerates to speed calculated in a . it takes 30.0 s to accelerate . find magnitude of average acceleration during this time interval

2007-03-06 09:41:15 · 2 answers · asked by alex_yeung330 4

2007-03-06 09:21:11 · 8 answers · asked by Anonymous