Physics - June 2007

2007-06-28 19:55:36 · 1 answers · asked by ETISHA R 1

What are bosons & what is the principle of making bose speakers & amplifiers?

2007-06-28 19:46:00 · 7 answers · asked by rajesh bhowmick 2

Does anyone know how to do this

A circuit having a resistance of 12 ohm, an indutance of 96mH and a capacitance of 52mF in series, is connected across a 220V, 50Hz supply. Calculate the following:

Total Impedance

current flowing through the circuit

the voltage across each component

the phase difference between the current and the supply voltage

The power factor of the circuit

2007-06-28 18:48:21 · 1 answers · asked by Anonymous

How do scientists keep track of the satellites? How do scientists make sure the satellites are not lost in space?

2007-06-28 18:19:45 · 2 answers · asked by Anonymous

how will this affect the environment?

2007-06-28 18:07:22 · 7 answers · asked by Anonymous

if 2 cars collide head-on each doing 50 mph is the impact felt by the drivers like hitting a wall at 100mph -or- does it feel like a 50mph impact, just shared by both drivers? Thank you

2007-06-28 18:00:11 · 3 answers · asked by Anonymous

How do we know the structure of atoms? If the structure has been proven or observed to be true, could sub-atomic particles also be essentially "hollow" like atoms?
Thanks

2007-06-28 17:25:55 · 3 answers · asked by sain et hereaux 2

when the play butotn is pressed , a CD accelerates uniformly from rest to 450 rev/min in 3.0 revolutions. if the CD has a radius of 6.0 cm and a mass of 17 g. what is the torque exerted on it?

i know the answer is 0.0018Nm but i need to know how to work it out. so if u could PLEASE show me like all the steps u did that would be cool

2007-06-28 17:01:05 · 6 answers · asked by spaceranger2010 2

I have the following PDE to solve:

(mu - ny)u_x + (nx - lu)u_y = ly - mx; l,m,n constant

I can't find a starting point to solve this. Separation of variables doesn't work and whatever I do I keep having all three variables (u,x,y) present in my starting eqns.

Has anyone got any tips?

2007-06-28 17:01:02 · 2 answers · asked by Anonymous

My friends and I were having a discussion about this and we couldn't come to an agreement: which will generally stop shorter from a given speed in average weather conditions - a semi or a car?

Obviously, the tractor-trailer weighs much more, meaning more force would be required to stop it... but also meaning the frictional force exerted on the road would be higher.

I know the answer depends largely on how the semi is loaded and such, but just assume everything to be average.

If possible, citing sources would be great. Thanks!

2007-06-28 16:41:55 · 7 answers · asked by Travis G 2

Ok so theres a boeing 747 on a giant treadmill belt thats programmed to spin at the same speed as the wheels on the plane. If the plane reaches enough speed, can it take off?

I want to see who can figure this out, first one with the right answer gets "best answer." GO!

2007-06-28 16:20:50 · 6 answers · asked by Anonymous

2007-06-28 16:09:16 · 1 answers · asked by Anonymous

we are matter and everything are atoms. what is empty spaceÉ. Is nothing made out of atomsÉ. Is everything atomsÉ

2007-06-28 15:41:19 · 2 answers · asked by Lee Edward 1

how is it impossible?

2007-06-28 15:20:36 · 4 answers · asked by Anonymous

I can derive the relativistic equations for time dilation and length contraction for Einstein's theory of relativity; is there a similar derivation for relativisitic mass increase? I figure it must have something to do with the conservation of momentum at relativistic speeds, but I have not yet seen a good derivation.

2007-06-28 15:04:38 · 3 answers · asked by Rob K 2

the earth's rate of rotation is constantly decreasing, causeing the day to increase in duration. in the year 2006 the earth takes about 0.840s longer to complete 365 revolutions than it did in the year 1906. what is the average angular acceleration of the earth? give your answer in rad/s^2

if anyone could help that would be sooooo great. its due tomorrow :(

2007-06-28 13:35:09 · 3 answers · asked by spaceranger2010 2

2007-06-28 13:26:48 · 12 answers · asked by shay 2

I am curious because I like to be in the know.

2007-06-28 12:31:06 · 5 answers · asked by Anonymous

I'm doing an experiment where I am shining an infrared LED through a single element lens (plano-convex lens) onto a surface which is about 3 inches away. I've placed a little square in front of the LED and I'm projecting the square image to the 3 inch surface. The square is nicely focused onto the surface however there are faint blobs of diffuse light emminating from the the squre edges. Can anyone please inform me as to the cause of this and if there is a solution with a single lens. Thank You.

2007-06-28 12:03:52 · 5 answers · asked by mrlexington 2

A bubble with a volume of 1.00 cm3 forms at the bottom of a lake that is 20.0 m deep. The temperature at the bottom of the lake is 10.0°C. The bubble rises to the surface where the water temperature is 35.0°C. Assume that the bubble is small enough that its temperature always matches that of its surroundings. What is the volume of the bubble just before it breaks the surface of the water?

2007-06-28 11:54:09 · 3 answers · asked by Anonymous

There's alot of buzz lately about a guy in Florida who claims he's invented a new energy source. Most skeptics say whatever he's doing will use more energy than it releases. What do you think?

2007-06-28 11:40:22 · 3 answers · asked by Anonymous

Is there a limit or a line that can't be crossed or can a scientist simply not be allowed to imagine to make a scientific theory such as, you know....

2007-06-28 11:21:28 · 5 answers · asked by tarquinn j 1

2007-06-28 10:29:15 · 2 answers · asked by Anonymous

I saw this equation yesterday, and was wondering where it came from.

Range = (Vo² sin(2theta))/a
Where range is the change in x
Vo is the initial velocity
and a is the acceleration

Thanks.

2007-06-28 10:06:47 · 3 answers · asked by Anonymous

2007-06-28 08:56:14 · 5 answers · asked by Alexander 6

Physics help PLEASE !!?
A rock is thrown straight upward with an initial velocity of 9.6 m/s in a location where the acceleration due to gravity has a magnitude of 9.81 m/s2.

What is period of its elliptical orbit?

2007-06-28 08:46:23 · 4 answers · asked by Alexander 6

2007-06-28 08:45:03 · 1 answers · asked by jm123 1

How long before we will invent machines with capable emotions that are "human like".

2007-06-28 08:39:40 · 11 answers · asked by mrhoppy22 3

How is it that a layer of cream can stop a particle that travelled from the sun, punched through 50 miles of atmosphere and still has enough energy to cause a burn?

2007-06-28 08:12:31 · 4 answers · asked by auroraman 1

can you make yourself or other objects float in mid air with out support such as magicians wire?

2007-06-28 08:11:33 · 9 answers · asked by Annie 1