Science & Mathematics - 9 September 2007

2007-09-09 16:23:35 · 3 answers · asked by Anonymous in Engineering

As you eat your way through a bag of chocolate chip cookies, you observe that each cookie is a circular disk with a diameter of 8.50 +- 0.02 cm and a thickness of 0.050 +- 0.005 cm. Find the uncertainty of the ratio of the diameter to the thickness.

2007-09-09 16:22:49 · 1 answers · asked by Anonymous in Physics

2007-09-09 16:20:59 · 6 answers · asked by Anonymous in Astronomy & Space

A pulsar is receding directly away from the Earth with a speed of 8.0 C, a starship is sent towards the pulsar with a speed of 0.95 C relative to the earth. If an earth observer sees 153 pulses emitted every second, what rate does the starship see the pulses?

2007-09-09 16:14:55 · 2 answers · asked by Mike M 2 in Physics

2007-09-09 16:14:46 · 10 answers · asked by knwjtw2004 2 in Mathematics

Is there a website that could tell me how to imput exponents, square roots, and all those other mathy symbols that don't exist on the keyboard? I like being able to do this kind of thing without always copy-pasting, since I use an IME and type with symbols from other languages.

2007-09-09 16:14:37 · 2 answers · asked by Anonymous in Mathematics

A particle has a constant acceleration of a = (6i + 4j) m/s^2. At time t =0, the velocity is zero and the position vector is r - (10m) i. Find the velocity and position vectors at any time, t.

2007-09-09 16:14:36 · 1 answers · asked by Anonymous in Physics

Find a polynomial function with integer coefficients that have the given zeros: (1+squareroot of 3i), 2, 2, (-1-squareroot of 2)

2007-09-09 16:11:55 · 6 answers · asked by kat 2 in Mathematics

2007-09-09 16:11:35 · 4 answers · asked by cucha 1 in Medicine

find the coordinates of the centroid, where the medians are concurrent of a triangle with vertices at (0,0), (a,0), and (b,c).

Plz show work. thx

2007-09-09 16:08:38 · 2 answers · asked by NT 2 in Mathematics

A bit funny really, I am having since the last 3 months 2 SP episodes a week, one week it was 7 SP episodes. Only thing is, alot of it isn't really actually Sleep Paralysis at all, I don't feel like something is sitting on my chest, infact sometimes if my brother turns the light on in my room when I'm asleep I immediately wake up, yet If the episode was pleasant I found myself naturally talking, laughing and moving my body into a sitting up position of sorts yet I know fully well I'm going to be hallucinating for another minute or so (this can get pretty amusing! I sometimes wave hello with my hand). I wonder if there is something else going on, I don't freeze up unless its 'frightening' but when It's not I find moving and everything easy, I can't find anywhere on the web this distinguishment.

2007-09-09 16:08:07 · 8 answers · asked by the khemist 2 in Parapsychology

what would happen if we nuked the sun or the moon, or any planet? and has a black hole ever been found?

2007-09-09 16:07:00 · 3 answers · asked by pokemonguyjosh 3 in Astronomy & Space

2007-09-09 16:06:54 · 3 answers · asked by Anonymous in Astronomy & Space

One car is going 88km/h and the other is going 115 km/h, suppose they are both going in the same direction with the same starting position. How far must the faster car travel to arrive 16 mins before the slower car? Answer in units of km.

2007-09-09 16:00:53 · 1 answers · asked by Skyler H 1 in Physics

2007-09-09 16:00:43 · 4 answers · asked by dsgc05™ 6 in Physics

Diana’s favourite coin is a dime. She has a whole bunch of them – she does not know exactly
how many, but she is sure that she has fewer than 250. One day she was arranging them on her
desk in different ways. She found the following:
• When she put them in piles of three, there was 1 dime left over.
• When she put them in piles of four, there was 1 dime left over.
• When she put them in piles of five, there was none left over.
How many dimes does Diana have? Is there only one possible answer?

2007-09-09 15:59:52 · 3 answers · asked by Anonymous in Mathematics

I moved into a new apartment with a couple friends at the beginning of the summer. It's an upper apartment in a very old building - at least 100 years old. I know that old building tend to shift and creek a lot, but there seems to be more than that. Glasses fall out of shelves, pictures fall off of walls, lights turn on while we're out. I'm not really sure of the history of the building, I know it's been lots of things throughout the years. Is there any way I could find out if this place is haunted?

2007-09-09 15:58:07 · 14 answers · asked by AllieSono 2 in Paranormal Phenomena

be 16.09 x 10 (to the second)

2007-09-09 15:56:49 · 3 answers · asked by Anonymous in Mathematics

0.005 5,050 0.0008 1,000 1,000,000 0.25 0.025 0.0025 500 5,000

2007-09-09 15:56:44 · 4 answers · asked by justyn b 1 in Chemistry

Calculate the future sum of $1,000, given that it will be held in the bank for 5 years and earn 10% compounded semiannually.

2007-09-09 15:53:06 · 3 answers · asked by BxBmr76 1 in Mathematics

...a regular light?

2007-09-09 15:51:50 · 5 answers · asked by slguthmuller 2 in Physics

2007-09-09 15:50:51 · 6 answers · asked by Rex E 1 in Chemistry

T^3 + 3T - 12T + 4
_______________
T^3 - 4T

The part is factored like (T-2)(T^2 + 5T -2), when multiplied back would give you T^3 + 3T - 12T + 4 (the numerator). Question is: WHY is it (T-2)? What's the logic behind choosing (T-2)?

2007-09-09 15:49:19 · 6 answers · asked by D 3 in Mathematics

2007-09-09 15:49:02 · 3 answers · asked by Anonymous in Geography

1. Describe bichromatic analysis including the principle, arrangment of components and advantages. Extrapolate the principle to multiple-wavelength spectrophotometry. Then list examples of comon interferences that can be corrected using bichromatic analysis.

2. The difference between single beam and double beam spectrophotometry?

2007-09-09 15:47:02 · 4 answers · asked by Anonymous in Engineering

Maybe i was thinking "Get Bent Bar & Grill" or something like that, any idea's would be helpful.

2007-09-09 15:46:45 · 16 answers · asked by Anonymous in Astronomy & Space

I know what the answer is, but I don't know how to get there!

Question: A ball is thrown upward from the ground w/ an initial speed of 25 m/s; at the same instant, another ball is dropped from a building 15 m high. After how long will the balls be at the same height?

Answer: 0.60 s

2007-09-09 15:46:27 · 4 answers · asked by smeiou78 4 in Physics

2007-09-09 15:46:20 · 3 answers · asked by Fariborz B 1 in Zoology

I'm supposed to take the cube root of negative eight; how do I do this without a calculator (or decimals?)

2007-09-09 15:44:18 · 12 answers · asked by Anonymous in Mathematics

It has been suggusted thaty rotating cylinders about 16 km and 8 km in diameter should be placed in space for future space colonies. The rotation would simulate gravity for the inhabitants of these colonies. Explain the concept behind this proposal.

2007-09-09 15:44:03 · 2 answers · asked by Oscar A 2 in Physics