Physics - July 2007

How do u calculate the speed of light travling in a diamond, if no information was given (like numbers).

thanks for the help, i appreciate

2007-07-29 11:07:11 · 6 answers · asked by natiassefa 2

A rock is suspended from a string; and it moves downward at constant speed. Which one of the following statements is true concerning the tension in the string if air resistance is not ignored?


1)The tension is greater than the weight of the rock.


2) The tension points downward.


3) The tension is less than the weight of the rock.


4) The tension is zero newtons.


5) The tension is equal to the weight of the rock.

2007-07-29 10:42:49 · 4 answers · asked by Anonymous

what slows it down?

2007-07-29 09:53:23 · 7 answers · asked by hobo 6

2007-07-29 09:39:51 · 2 answers · asked by Anonymous

as we can see ships and boats on sea and also objects floats on water

2007-07-29 09:18:39 · 21 answers · asked by ZAM 1

2007-07-29 09:07:01 · 9 answers · asked by Anonymous

A nuclear scientist aquaintance told me that, contrary to popular belief, 'THE ATOM' is a myth, theory, idea etc. which, though accepted by millions as the best explanation of matter so far and even accepted as a hard fact of life by equally as many, is nevertheless unproven. Could someone enlighten me and/or point to authoritative information/websites that will give me a clear and honest and up-to-date answer on this question. Many thanks

2007-07-29 09:06:46 · 10 answers · asked by Bumblebee 1

i've recently learned a lot about optics and the working of the eye in my physics class and from this course i have realised the harm in watching tv in a dark surrounding.
The focal lenght of the eye has to adjust each time a scene on tv is changed [which lasts for about 9 seconds] so this causes strain on the eye and due to this, the eye defects worsen. i tried explaining this fact to my friends but they think its not true. i care about their eyes but they don't seem to care.
am i wrong in this?? ps all this was xcplained by my phy teacher!

2007-07-29 08:45:06 · 4 answers · asked by Anonymous

I really want to know.

2007-07-29 08:22:40 · 6 answers · asked by Anna 3

I need to know what the difference is between them to answer these questions:

Which of the following is NOT a vector quantity?
a.) 2 miles per hour
b.) 2 pounds
c.) 2 newtons
d.) 2 kilometers per hour east
e.) 2 dynes

Which of the following is NOT a scalar quantity?
a.) 2 miles per hour
b.) 2 kilograms
c.) 2 apples
d.) 2 ounces
e.) 2 liters

I'm not looking for you to answer the questions as I already know the answers[ a.) and d.) - from the book] but I need to know the difference between a scalar and vector quantity so I can answer them myself. The book is simply a workbook and has no explanations.

2007-07-29 08:11:00 · 4 answers · asked by Anonymous

Now, I know the equation is elapsed time= distance/average speed. I measured my own arm and got 26.25 inches, converted that to meters, punched in the numbers and got 0.0067 m as the answer. However, my physics book says the answer is 10 ms.
...What am I missing?

2007-07-29 07:20:34 · 4 answers · asked by Diff 1

Would a plane in the air make a shadow bigger than the plane, smaller than the plane, or equal in size to that of the plane?

2007-07-29 06:49:52 · 10 answers · asked by symperl 2

There has to be a reference point to determine the speed of an object. Supposedly as you approach the speed of light mass and the energy required approach infinity. My question is how can you approach the speed of light without a reference point? Since everything is relative why would not the Earth approach infinite mass as it is backing away from me near the speed of light rather than my ship moving forward? I am trying to read "A Short History of Time" and that is where I get confused.

2007-07-29 06:41:17 · 5 answers · asked by Barkley Hound 7

I mean, can't he explain to the cop that if he knows where I am he can't possibly know how fast I'm going?

2007-07-29 05:09:56 · 5 answers · asked by Anonymous

2007-07-29 05:06:24 · 6 answers · asked by rexor 2

2007-07-29 04:44:59 · 1 answers · asked by Fabian 2

physics

2007-07-29 04:42:35 · 9 answers · asked by Anonymous

I always heard this was an impossible feat but in a previous question about acceleration in a vacuum due to gravity I was rewarded with this grand answer

"There is a speed limit to everything, though, and that’s the speed of light; nothing goes faster, not even things that have been falling in a gravitational field for a long time."

so if i drop a teddy bear down a vaccum tube of infinate length it will reach the speed of light?

2007-07-29 03:57:28 · 8 answers · asked by Anonymous

If the 1st anode accelerates the electrons, what does the rest of them do? Do they accelerate the electrons?If so, how do they do it? If not, can pls tell me wad they are for?

(note: i read that there are more den one anode in an electron gun from wikipedia)

2007-07-29 03:55:34 · 1 answers · asked by noob 1

Doesn't matter what species. Only smaller life form. Would it impact the same as a human-sized one?

2007-07-29 03:29:54 · 12 answers · asked by andy_lo17 2

2007-07-29 03:19:20 · 8 answers · asked by andy_lo17 2

2007-07-29 03:15:11 · 10 answers · asked by steven2008 2

that is why is it not affected by the gravitational field

2007-07-29 03:13:50 · 5 answers · asked by honey 1

2007-07-29 03:11:12 · 5 answers · asked by Anonymous

What does "consciousness" mean in quantum theory? Is it the same as the general definition of "consciousness," an alert cognitive state in which we are aware of ourselves and our situation?

2007-07-29 02:18:46 · 4 answers · asked by ayakofeminine 2

i made a cup of coffee by putting a little coffee in a paper filter and putting it in a cup of hot water tea bag style. i left it overnight, about half full, with the top of the filter just hanging over the lip of the cup to keep it from slipping in. as you may have guessed (but to my amazement) the cup had emptied all over my desk by morning.

2007-07-29 02:07:51 · 3 answers · asked by karl k 6

The CT scan procedure involves taking multiple x-ray images of a certain section of the body. What is the procedure and how are this images combined to form the pictures that we finally see on the film? I am particulrly interested in knowing how the image of an 8-voxel cube is developed into the final image.

2007-07-29 02:01:57 · 2 answers · asked by tamburo 1

Has anyone else had this experience and if so have you an explanation. Could it be to do with the rotational speed at the equator is faster ?

2007-07-29 02:01:19 · 11 answers · asked by Robin C 4

Meaning instead of all matter being pulled towards the earth if for only 10 exact seconds all matter was repelled from earth, how dramatic would life change on earth. The cars, people, homes, trees, and yes oceans would start to head towards the upper skies only to then be brought back crashing onto earth. I think less than 1% of the population would survive, with calamity everywhere. I had a dream and sadly witnessed all this, and it scared the life out of me. But it did leave me wondering if a passing asteroid or meteor shower could actually affect earths gravity for only 10 seconds to destroy manking like this. All answers would be appreciated. trust me they would

2007-07-29 01:36:06 · 9 answers · asked by Anonymous

Wht's the value after 10 yrs.,percentages applying to original cost?

2007-07-29 00:27:56 · 2 answers · asked by MANDY 1