Science & Mathematics - 4 February 2007

An airplane flew for 4 hours against a head wind of 40km/h. On the return flight the same wind was now a tail wind, and the f;ight took 3 hours.Find the speed of the airplane in still air?

2007-02-04 06:29:19 · 2 answers · asked by surina g 1 in Mathematics

2007-02-04 06:27:37 · 12 answers · asked by booper_33 1 in Astronomy & Space

Please provide a scientific answer in specific detail. This is just for my own curiosity... so I am looking for an in depth physics/mathematical explanation as to why heat rises above cold air?

2007-02-04 06:26:51 · 9 answers · asked by Charleen 4 in Weather

2007-02-04 06:26:26 · 2 answers · asked by Anonymous in Mathematics

Please Help Me--- I really don't get Genetics : )

2007-02-04 06:25:10 · 4 answers · asked by LUV Life_123 2 in Biology

A large adult female found in southern California... I can find lots of info about WHAT they eat & HOW they eat, but now how FREQUENTLY they eat...?

2007-02-04 06:24:56 · 2 answers · asked by t_o_w_e_r_i_n_g 3 in Zoology

5a+5=90

2007-02-04 06:24:52 · 5 answers · asked by tony t 1 in Mathematics

she poured 500 milliliters out, how much is left? ty

2007-02-04 06:24:37 · 2 answers · asked by snicks 2 in Mathematics

2007-02-04 06:22:50 · 3 answers · asked by Rocky 1 in Mathematics

is 0.7 kilometers?

2007-02-04 06:22:43 · 4 answers · asked by snicks 2 in Mathematics

they are connected in series across a potential difference of 120 VAC. assuming what you have learned about DC circuits applies, and that the operating resistances of the bulbs are not affected by the series connection, calculate: (a) the power produced in each bulb, and (b) the total power porduced in the series circuit.

2007-02-04 06:21:17 · 1 answers · asked by rkh 1 in Physics

2007-02-04 06:20:53 · 14 answers · asked by susie 1 in Chemistry

Hemophilia is a sex-linked disorder carried on the X chromosome. A woman who is a carrier of hemophilia has the genotype X^H X^h also referred to as heterozygous for the trait. A man who has hemophilia is represented as X^h Y. A woman who is heterozygous for hemophilia marries a normal man. What will be the possible phenotypes of their children? How likely is it that their son will inherit the disease?

I got from a Punnett Square that they will all have hemophilia but I am not sure...I think I messed up somehow.

2007-02-04 06:20:29 · 2 answers · asked by Audy 1 in Biology

2007-02-04 06:18:42 · 6 answers · asked by The Flash 1968 1 in Botany

A 0.500-kg glider, attached to the end of an ideal spring with force constant , undergoes simple harmonic motion with an amplitude 0.040 m.

Compute the speed of the glider when it is at -0.015m.

Compute the acceleration of the glider at -0.015m.

Not really sure how to approach this one! Can anyone help me?

2007-02-04 06:18:20 · 1 answers · asked by Anonymous in Physics

explain why C20H40 is a solid at 25 degrees while C4H8 is a gas at the same temperature

2007-02-04 06:16:41 · 4 answers · asked by cutie pie! 3 in Chemistry

And where exactly is it located?

2007-02-04 06:12:48 · 8 answers · asked by banana 3 in Geography

It seems its needed for life so where do they get it from?

2007-02-04 06:12:09 · 3 answers · asked by rostov 5 in Zoology

2007-02-04 06:10:18 · 6 answers · asked by Anonymous in Engineering

2007-02-04 06:09:16 · 2 answers · asked by unknownnnnn 2 in Astronomy & Space

Looking at it from a psychological point of view, are ghosts real or not? I myself believe in ghosts, but I'm very sceptical when I hear people talk about ghost sightings. They see ghosts everywhere, but to me it sounds like they're all letting their imagination run free.
Most ghosts are sighted in old buildings. Why there? Logically speaking ghosts would more likely haunt new buildings, where the building of the foundations of those buildings have disturbed them? Or rather because the new building took away their old dwelling?
I speak from personal experience, having lived in a 3 year old housing estate where someone or something plagued my being there, down to a talking lift that started to say strange things, and my now ex-boyfriend heard and experienced the same things.

But those things happen only scarsely. So again, my question is; ghosts, are they real or not? And if they're not, explain why they can't be. If they are, explain why so.

2007-02-04 06:08:49 · 26 answers · asked by Anonymous in Parapsychology

this is an algebra1 question

2007-02-04 06:08:39 · 4 answers · asked by ♥Happy Holidays♥ 1 in Mathematics

2007-02-04 06:08:22 · 22 answers · asked by Anonymous in Biology

I was suppose to do this question...but it doesnt make any sense...

pg 62#3d

3a) A russion MiG-25 flies at 3395km/h. Convert its speed to m/s
b) a sneez takes o.5 s. Find the distnace the plane flies in the time it takes you to complete one sneez.
c) find the planes average acceleration if it takes 12.0 s to reach this speed from rest.
D) from what speed must the plane start in order to reach its final spped in 8.7 s?...<--is there enough info even??!

2007-02-04 06:07:38 · 10 answers · asked by no name 1 in Physics

2007-02-04 06:06:30 · 7 answers · asked by adam f 1 in Engineering

The perimeter of a rectangle is 70 cm. The width is (4x - 1)cm and the length is (6x - 4)cm. What is the length of the rectangle?

2007-02-04 06:05:12 · 13 answers · asked by freya 1 in Mathematics

2007-02-04 06:05:12 · 4 answers · asked by Anonymous in Weather

either by plane or any other transportation.i know its 9.5 hour time difference from where i live..dont worry, im not planning to go there its outta curiousity..

2007-02-04 06:03:59 · 5 answers · asked by Anonymous in Geography

Methane (the gas farts are made of) is lighter than air. If you fart, you are getting rid of this gas so does it make you heavier or lighter?

2007-02-04 06:02:59 · 1 answers · asked by vinnymass 1 in Chemistry

2007-02-04 06:02:33 · 7 answers · asked by davenport_2002_24 1 in Mathematics