Science & Mathematics - 12 September 2007

Two fishing boats depart a harbour at the same time, one traveling east, the other south. The eastbound boat travels at a speed 3 mi/h faster than the southbound boat.
After two hours the boats are 30 mi apart from each other
Find the speed of the southbound boat.

2007-09-12 03:40:31 · 2 answers · asked by alexo 4 in Mathematics

my mate said that stars dont exist the light we see r from billions of years ago but the stars r not there ??? now she confused me at this point lol so r the stars really there????? simple terms if u please :))

2007-09-12 03:40:22 · 24 answers · asked by only me !!! 5 in Astronomy & Space

(6x {raised}3-8x{raised}2-14x+13) divided by (3x+2)

2007-09-12 03:32:47 · 2 answers · asked by countess_von_katz 2 in Mathematics

I bought one of these , and they are amazingly accurate. They say it works by using capacitance. I cannot under stand how it uses capacitance to make such measurements,upto 150 mm !

2007-09-12 03:32:10 · 4 answers · asked by Nirmala 4 in Engineering

extrapolated from beneath the surface, could this lead to Global Warming?

2007-09-12 03:31:55 · 3 answers · asked by Anonymous in Earth Sciences & Geology

Find the resultant of these two vectors: 2.00 x 10^2 units due east and 4.00 x 10^2 units and 30.0 degrees north of west

I'm in a coorespondance course that does a horrible job explaining how to do this, so if anyone could help me out with this it would be greatly appreciated.

2007-09-12 03:31:21 · 4 answers · asked by Anonymous in Physics

Hey friends,just wanted to know what is the difference between "vapour"and "steam".
Please dont paste any links..

2007-09-12 03:28:38 · 6 answers · asked by Anonymous in Physics

I bought 5 stalks of bamboo..for health...1 stalk died...so I bought another Stalk(to keep 5)..and another one died....Does this mean the bamboo is working and taking my illness away?? Or am I just unlucky!!!Thanks

2007-09-12 03:27:58 · 8 answers · asked by Anonymous in Other - Alternative

According to the Wall Street Journal, 14,200,000 videotape copies of Walt Disney's Fantasia have been sold to date. Write that number in scientific notation

A. 142 x 1,000,000
B. 1.42 x 106

C. 1.42 x 107

D. 142 x 107

2007-09-12 03:27:29 · 9 answers · asked by kelly 1 in Mathematics

f(x)=x^2-4 -2
explain your working please or just list out the steps.

pre-calculas sucks...i hate it

2007-09-12 03:26:43 · 4 answers · asked by Anonymous in Mathematics

The car's engine is 200 times as powerful, yet the lawn mover is much louder. It seems that a more powerful engine should be louder, right ?

2007-09-12 03:24:07 · 11 answers · asked by zim_8 4 in Engineering

Why does glycine not exist in the uncharged form, but rather in salt (zwitterion) form?

2007-09-12 03:22:16 · 4 answers · asked by jim m 3 in Chemistry

how do you determine if these inequalities are true? i know how to look and tell but not solving.
3 is greater than equals to -5 (which is true) but how can you show that it is true?

2007-09-12 03:20:30 · 4 answers · asked by petite fille 2 in Mathematics

Hi, Just need a hand solving these any help would be great. showing working out will get the best answer.
Thanks

1)
lim cos( 7 n^−1 ) =
n → 0+

2)
lim cos( π n) =
n → ∞

3)
lim tan(π/n)
n → ∞

2007-09-12 03:12:55 · 3 answers · asked by Anonymous in Mathematics

1) Does a 9 year old John Titor exist today?
2) Is his controversial time travelling proved to be a hoax?
3) If he exists, does his 38 year old self from the year 2036 appear to see his 9 year old self today?

2007-09-12 03:08:56 · 3 answers · asked by Kyle J 6 in Physics

2007-09-12 03:07:10 · 11 answers · asked by redbone001 1 in Mathematics

I'm gonna do an expository essay on cosmetic surgery, but i'm not sure how to go into detail about it. What is something you wonder or question when it comes to the topic of plastic surgery?

2007-09-12 03:04:56 · 5 answers · asked by camryangel33 2 in Medicine

calculate the mass of,
1) one mol of atomic nitrogen

2) one mol of molecular nitrogen

2007-09-12 03:03:14 · 1 answers · asked by Anonymous in Chemistry

2007-09-12 03:03:09 · 1 answers · asked by Anonymous in Physics

2007-09-12 02:56:43 · 4 answers · asked by challenged 1 in Mathematics

2007-09-12 02:54:59 · 7 answers · asked by Bill W 【ツ】 6 in Geography

show how to get the answer

2007-09-12 02:44:01 · 5 answers · asked by Harley 1 in Mathematics

A heavy rainstorm dumps 1.0 cm of rain on a city 5 km wide and 8 km long in a 2-h period. How many metric tons (1 metric ton = 10^3 kg) of water fell on the city? [1 cm^3 of water has a mass of 1 gram = 10^-3 kg.]

Thats the actual question straight from the book. I have no ssense of direction on what to do. I know i have to convert some units of measurement but i have no clue?

2007-09-12 02:41:29 · 5 answers · asked by Anonymous in Physics

2007-09-12 02:38:33 · 4 answers · asked by Manoj MT 1 in Engineering

why does shorter wavelengths produce a clearer image?

why is wavelength the limiting factor in magnification and clarity?

2007-09-12 02:33:47 · 2 answers · asked by Anonymous in Other - Science

a liquid is poured on a flat surface. it forms a circular patch which grows at a steady rate of 5cm2/s. find, in terms of pi, the rate of change of the radius after 20s.

pls show the steps

2007-09-12 02:30:56 · 2 answers · asked by Anonymous in Mathematics

2007-09-12 02:30:08 · 1 answers · asked by adrian s 1 in Mathematics

almost every time its going to rain or storm i know it. i get this weird almost anxious feeling in my chest and my head feels weird. sometimes even a little dizzy. sometimes i feel sort of tingly. i don't even have to be outside or near a window and i just know i've been this way for at least 2 or 3 years. why? is something wrong with me?

2007-09-12 02:29:24 · 4 answers · asked by ju_bean1 2 in Weather

I may have other siblings due to my father’s extra marital affairs. There is one female in question that may be my sister. Is there a genetic test that can be done to prove this? If so which one?

2007-09-12 02:28:52 · 6 answers · asked by MUZE N 1 in Medicine

Are you a subscriber?What do you think of it?

2007-09-12 02:24:05 · 6 answers · asked by Dr. NG 7 in Other - Alternative