Physics - March 2007

can someone please answer the above q.

thanks

2007-03-27 00:25:03 · 3 answers · asked by Anonymous

2007-03-26 23:55:32 · 30 answers · asked by Anand k 1

Eventually dust particles end up on the floor or on furniture. But many stay in suspension in the air for long periods of time before falling. What forces hold them up temporarily?

2007-03-26 23:45:19 · 7 answers · asked by Daniel C 1

2007-03-26 23:12:54 · 8 answers · asked by Ketan Kadivar 1

I thought it was cos there was a big magnet at the north pole,and thats how the pointer points north. But when i thought about it that's stupid. so what makes the magnetic force that the pointer picks up.

2007-03-26 23:12:35 · 9 answers · asked by heebygeeby 4

How complex is it? Why are other countries today (mostly terrorist states) struggling with it when in 1940's we (U.S.) did it with plumbing tools to work with basically compared to today?

2007-03-26 23:07:23 · 3 answers · asked by Anonymous

i think refraction is caused by bending of light rays due to decrease in speed and due to gravity.

2007-03-26 22:50:35 · 5 answers · asked by Steve 1

2007-03-26 22:38:30 · 8 answers · asked by "nee" 1

1/v + 1/u = 1/f

2007-03-26 22:19:35 · 1 answers · asked by Rishu 1

what is the system of measurement that the united states use. (it's not the metric system)

2007-03-26 21:51:52 · 7 answers · asked by Liquid Cherry Blood 1

2kg water at room temperature 20 celcius is placed inside a refrigerator with an internal temperature of 2 celcius.
a. calculate the amount of heat Qc that must be removed to cool the water to 2 celcius.
b. the coefficient of performance?
c.how much work done?
d. what is the total heat dumped by the refrigerator into the kitchen

2007-03-26 21:41:11 · 2 answers · asked by sim 1

Please help......I think its germanium with .7 ev, correct me if i am wrong, if its doped germanium or silicon please notify, note that i am asking a substance, it might not be a metal! This is the second time i am asking this question!

2007-03-26 21:32:44 · 1 answers · asked by Anonymous

What is the EPR Paradox and what is Einstein's 'hidden variables idea'?

2007-03-26 20:10:25 · 2 answers · asked by sh 1

What is Bell's Theorem and how does it resolve the EPR Paradox? What was the significance of the John Bell's contirbution to quantum physics?

2007-03-26 20:09:32 · 2 answers · asked by sh 1

2007-03-26 20:07:55 · 1 answers · asked by boatermoat 1

my chem teacher(hes an idiot) told me that the reason theres less air pressure when you go higher is because the gasses dont have buildings to bounce off of. I thought it was because of the weight of gasses coming down onto you.

2007-03-26 19:44:22 · 5 answers · asked by Zapking 2

2007-03-26 19:43:49 · 6 answers · asked by Jeffrey 1

What is the speed of the electron placed at a plate with potential 25V to the plate of 140V. What if this were to be changed to a proton? What speed would it be traveling?

How do I do this?

2007-03-26 19:30:04 · 1 answers · asked by ☆ 2

One version of Bell's theorem analysis is given as =2sqrt(2) where A,B,C,D are quantum variables(observable) and <> means expected (average) value. So if A,B,C,D are classical random variables let S=.

Find possible values of S if these calssical random variables can only take values of +1 or -1.

2007-03-26 18:43:05 · 2 answers · asked by sh 1

I want to build a power supply to put out 12 V @ 1.0 A, and it will run off of 115 VAC.
My transformer is Primary 115VAC, secondary 24 VAC 2.0 A
My bridge rectifier 50 V 2 A
My Regulator 12 V 1.0 A

Q. I want to install a fuse from the main line to the transformer but I am not sure what size fuse I should use.

2007-03-26 18:24:49 · 4 answers · asked by Anonymous

2007-03-26 17:53:09 · 8 answers · asked by Anonymous

2007-03-26 17:51:44 · 6 answers · asked by Anonymous

The hang time of a basketball player who jumps a vertial distance of 2 feet (0.6 m) is about 0.67 s. What will be the ahng time if the player reaches the same height while jumping 4 feet (1.2 m horizontally)?

2007-03-26 17:44:34 · 2 answers · asked by Tone_Loc 2

lets say there was a corrider stuck to wall of a building. shaped like a rectanglular cube 2 meters wide and 3 meters high
what would be the shortest ladder posibble that if it leaned on that corrider would reach the wall

hint it doesnt have to be 3d when your imagining it just imagine a rectangul 2m wide and 3 meters high in a ritgh angel triangle what could be the shortest hypotenous that could maintian that triangle with that rectangul but still keep it ritgh angled?

2007-03-26 17:39:17 · 2 answers · asked by morgan 2

Two parallel plates are separated by 5 cm. Plate #1 has a potential of 45 V and Plate #2 has a potential of -20V. Both are constant, what forces would be felt at the following if an electron were placed:

a) directly between the two
b) 1 cm from the -20 V plate
c) 1 cm from the 45 V plate

I don't understand any of this!!
Can someone explain not only how to do this problem, but how I would figure it out in other situations?

2007-03-26 17:27:57 · 2 answers · asked by ☆ 2

If i have two photons of light and they have frequencies of 6.00x10^16Hz and the other frequency of 1.20x10^17Hz. If the lower frequency wave (6.00x10^16Hz) has an energy of approximatly 4.00x10^-17J what is the energy of the higher frequency wave (1.20x10^17Hz)?

2007-03-26 17:24:11 · 4 answers · asked by Anonymous

Is the mass directly proportional to the square of the period? I mean, it makes sense logically that the mass of the object would affect how fast it spins. Can anyone provide a source?

2007-03-26 17:20:48 · 2 answers · asked by Anonymous

Will this affect the accuracy of measuring Rx?

2007-03-26 17:16:45 · 3 answers · asked by CustomBentley 2

2007-03-26 17:13:05 · 1 answers · asked by Mz. Alessy 1

if an object of mass 20kg starts at 5m above the ground what are the kinetic and potential energies at 2.5m above the ground? what is the objects velocity at this same height

2007-03-26 17:10:39 · 2 answers · asked by Anonymous