Science & Mathematics - 3 November 2007

A basket contains 34 heads of lettuce, 5 of which are spoiled. If a sample of 2 is drawn and not replaced, what is the probability that both will be spoiled?

2007-11-03 06:27:22 · 4 answers · asked by Jerry M 1 in Mathematics

I would also like to know the average lifespan of a gold mine

2007-11-03 06:26:22 · 1 answers · asked by Goldminer 1 in Earth Sciences & Geology

For a project i need to name two non euclidian geometries and have no clue please help thanks.

2007-11-03 06:25:24 · 6 answers · asked by tom s 2 in Mathematics

I want to convert my dory into a peddle-boat by mounting a recumbant bicycle onto the boat and running a variable pitch propellor through a drive shaft. How can I convert the rotational force of the bicycle in the vertical plane (like a bike wheel spinning) to the transverse plane (like a propellor turning)?

Could this be an efficient method of propulsion? The only pedal boats that I have seen are those very inefficient pontoon boats on ponds. Why isn't pedalling used more as a propulsion system in a boat - it seems to me an under-used strategy.

P.S. - I like rowing but I hate facing backwards all the time.

2007-11-03 06:24:34 · 2 answers · asked by megalomaniac 7 in Engineering

2007-11-03 06:19:54 · 4 answers · asked by Anonymous in Medicine

my friend asked me and she said do bees have mouth?

2007-11-03 06:17:15 · 3 answers · asked by fashionlover36 2 in Zoology

There hasn't been a sunspot on the sun for 26 days now, does this happen regularly during a solar minimum or is it quite rare for the sun to go so long without one.

2007-11-03 06:15:44 · 4 answers · asked by willow 6 in Astronomy & Space

2n^2= -1+6n

2007-11-03 06:13:26 · 8 answers · asked by Anonymous in Mathematics

2007-11-03 06:12:16 · 2 answers · asked by trubble 1 in Geography

I'm thinking of joining the The British Bone Marrow Registry, but I'm not sure what you actually have to do.

I give blood at the moment and that's fun, you get free biscuits and coffee, plus I get to see a bag of my red stuff.

What happens when you give bone marrow though? Is it an operation? Does it hurt? Do you have to stay in hospital? Does it affect your life? How do they get the marrow? What is the procedure?

The NBS sent me a video about "Your First Blood Donation" before I donated blood for the first time, is there anything like that around for bone marrow?

2007-11-03 06:05:39 · 6 answers · asked by James Geddes 2 in Medicine

Please answer the question. and
how mant people did Pliny the elder save in the eruption of AD 79?
When is Mount. Vesuvius next expected to erupt or is it overdue?
Why was the area arount Mount. Vesuvius declared a national park on June 5th 1995?
TA very much
xox

2007-11-03 06:05:15 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2, 4, 6, 3, or 5?

2007-11-03 06:02:11 · 7 answers · asked by crazily confused 2 in Geography

a circle has the equation, x^2 + y^2 - 12x - 6y + 20 = 0 express x^2 + y^2 - 12x - 6y + 20 = 0 in the form (x-a)^2 + (y-b)^2 = r^2

find the coordinates for the centre of the circle

find the radius of the circle

2007-11-03 06:01:37 · 4 answers · asked by Anonymous in Mathematics

Please gimme info on mount vesuvius urgent! Not just bout ad 79 or the burying of Pompeii and Herculaneum! Please no sarcastic comments like "its a volcano" coz im not dumb. Please i need the info with websites i can use or anything no Wikipedia coz ive used dat. Please Help Thanks. xox

2007-11-03 05:52:49 · 8 answers · asked by Anonymous in Earth Sciences & Geology

What is the maximum load that could be suspended from a copper wire of length 1.5 m and radius 1 mm without breaking the wire? Copper has an elastic limit of 2 × 10^8 Pa and a tensile strength of 4.1 × 10^8 Pa.

2007-11-03 05:52:20 · 2 answers · asked by Anonymous in Physics

Water entering a house flows with a speed of 0.22 m/s through a pipe of 2.1 cm inside diameter. What is the speed of the water at a point where the pipe tapers to a diameter of 4.5 mm?

2007-11-03 05:49:46 · 1 answers · asked by Anonymous in Physics

I'm doing a cross word, so it should start with F and the second last letter should be A. There are 7 letters in the word.

2007-11-03 05:43:03 · 4 answers · asked by britney♥ 2 in Earth Sciences & Geology

2007-11-03 05:38:46 · 3 answers · asked by jpmarzoukoil 1 in Earth Sciences & Geology

....If we've never been there?

2007-11-03 05:37:47 · 24 answers · asked by Katie Z 3 in Earth Sciences & Geology

2007-11-03 05:37:23 · 3 answers · asked by Anonymous in Astronomy & Space

is it tonight or tomorrow night?

2007-11-03 05:36:32 · 10 answers · asked by J 2 in Astronomy & Space

2007-11-03 05:33:18 · 4 answers · asked by carboncruncher 2 in Astronomy & Space

In a certain sequence of numbers, each term after the first term is 3 times the preceding term. If a and b are two terms in this swquence and if a / b is 27, how many terms are there between a and b, not including a and b?

In the right triangle ABC above, y/3=3/x + y. What is the value of y?

Right Triangle ( Hypotenuse facing the bottom.) (Base is 3 on the right)(Height is 4 on the left) ( Right angle on the top is making a altitude to the bottom making a point D and a right angel to the left.) Now There should be 2 triangles connecting to each other first one on the left is ABD 2nd is BDC.

So far im guessing that triangel BDC should be a right triangel as well

2007-11-03 05:30:32 · 2 answers · asked by Anonymous in Mathematics

2007-11-03 05:30:23 · 1 answers · asked by mahsa h 1 in Geography

2007-11-03 05:25:54 · 3 answers · asked by sathi 2 in Mathematics

Maybe it would be financially unviable to make aeroplanes out of this material- but then why have a health service that costs billions of pounds to run?

Or, maybe it would be far too expensive to build engines that could withstand the increased weight of the aeroplanes- but how much does it cost to replace the aeroplanes that are destroyed during crashes and improve the design of engines to attends to defects etc. and limit the contribution they had to the crashes in the first place?

2007-11-03 05:25:37 · 16 answers · asked by ►Aurora Borealis 5 in Engineering

2007-11-03 05:20:01 · 5 answers · asked by WHITE LOTOUS 2 in Geography

2007-11-03 05:16:50 · 7 answers · asked by arctrns7@att.net 1 in Geography

2007-11-03 05:16:37 · 2 answers · asked by dkhgvusdygv 1 in Geography

2007-11-03 05:10:02 · 3 answers · asked by Anonymous in Earth Sciences & Geology