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Science & Mathematics - 10 November 2007

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please help!

2007-11-10 10:11:49 · 7 answers · asked by Anonymous in Mathematics

dont shout at me if you know who my science teacher is or what project i am talking about...

anyway i have a project due in three months and i really need help getting started. can anyone show me a website or the name if a book which can help me with my project? we have to build a hoist that can lift a mass of 2 kilograms 10 cm up and 10 cm to the side...with one switch..but we have no idea how to build it or where to put the switch or the motor or anything at all...

PLEASE HELP US!!!!!!!!!!!!!!!!!!!! =]


AND I REPEAT: DO NOT CUSS AT ME or any mean comments please?

2007-11-10 10:03:43 · 6 answers · asked by *~Simplymyself~* 3 in Engineering

2007-11-10 10:00:44 · 9 answers · asked by jmonty_59 1 in Geography

big white ball with a little red. I am looking at it when it is low in the sky. do i need a filter( if yes please tell me what kind ).
Again I am using a meade 4.5" reflector with my 8 mm eyepiece. i am sure that i am looking at jupiter.

2007-11-10 10:00:22 · 7 answers · asked by Anonymous in Astronomy & Space

Please need it by Monday.
It is thirteen word totle.

2007-11-10 09:58:33 · 3 answers · asked by angela 3 in Earth Sciences & Geology

If sperm is live how can you freeze it using liquid nitrogen and cryogenics and then bring it back to life 10 years later? What happens to the 'life' part of the sperm during this period. Is it frozen in a state of slumber and what causes it it reappear upon defreezing?

2007-11-10 09:53:03 · 1 answers · asked by dih 1 in Biology

The genotype of F1 individuals in a tetrahybrid cross is AaBbCcDd. Assuming independent assortment of these four genes, what are the probabilities that F2 offspring would have the following genotypes?
a.)aabbccdd
b.)AaBbCcDd
c.)AABBCCDD
d.)AaBbccDd
e.)AaBBCCdd

i know it will be a 16 x 16 punnett square. But I don't know what to cross. Can you please help me? thanks.

2007-11-10 09:49:41 · 3 answers · asked by jenn 1 in Biology

http://wapsisquare.com/d/20071109.html
...shows a rather large diamond produced. Should it be this large? How many apples would be needed to produce a carat (not a carrot)?

2007-11-10 09:48:42 · 5 answers · asked by BotanyDave 5 in Chemistry

the result of multiplying the sum of the first n positive even integers by 4 and then adding 1 is always a perfect square.

2007-11-10 09:43:11 · 4 answers · asked by Anonymous in Mathematics

When a squirrel buries its food for the winter how does it know where it is buried,does it remember or do they bury that much that they can't go wrong.
I know they are vermin and should be culled but my kids love them.

2007-11-10 09:42:11 · 9 answers · asked by my_1stherald 2 in Zoology

How do i calculate the current flow in a domestic mains circuit?
I remember the ohms law triangle from school, V I R and i know there is one for power (watts) calculations, i researched this online although i have since forgot how that one is layed out ? In any case i thought it was W/V=I, so for my electrical item this would be 600/240=2.5 amps However on the item itself there are 2 ratings- 3 amps and 6.2 amps clearly 3 amps refers to my above calculation plus a safety margin, where does 6.2 amps arise from- there is reference to the cos value, I vaguely know about including the cos calculation but do not know how it works or when it applies? I live in the UK in a standard residential property with a normal mains supply.......

2007-11-10 09:31:30 · 9 answers · asked by nurnord 7 in Engineering

Can you help me prove this?

If a_n, b_n are real sequences, a, b are in R, a_n + b_n -> a +
> b, and a <= lim inf a_n, b <= lim inf b_n, then a_n -> a and b_n -> b.
.

thank you

2007-11-10 09:27:57 · 2 answers · asked by Edson 1 in Mathematics

is it your dominant?

2007-11-10 09:27:55 · 4 answers · asked by Anonymous in Biology

2007-11-10 09:27:52 · 8 answers · asked by FuMan 2 in Physics

When I tried to simplify it came out to 3x=3x... please help! Is that the identity something...........? I need this for my 8th grade Algebra class! Thank you so much.

2007-11-10 09:26:55 · 5 answers · asked by Anonymous in Mathematics

2007-11-10 09:17:27 · 7 answers · asked by greenhaus2002 1 in Engineering

If I'm building a DC motor with pemanent magnet stator, is it best to use large gauge wire for a low resistance, high ampage coil or use thinner wire to get a higher resistance and therefore require higher voltages for the same output power?

The intention is to power a vehicle with the finished motor, so a wide speed range and low speed torque are important.

2007-11-10 09:15:15 · 7 answers · asked by Doom 2 in Engineering

Suppose you take some ice from the freezer, put it in a pan, and heat the pan gently on the stove until the ice melts. Is this a chemical or a physical change?

chemical

physical

2007-11-10 09:12:48 · 5 answers · asked by Anonymous in Chemistry

Ex. If I had 2750 feet, how could I convert that into 1/72 scale?

2007-11-10 09:11:43 · 2 answers · asked by the klip 1 in Mathematics

You have seen bubbles form inside the bottle when you open a soda bottle. Explain this phenomenon.

2007-11-10 09:11:25 · 4 answers · asked by Anonymous in Chemistry

Supposed these beings were humanoid and not frighting and just wanted to become acquainted with an earthling?

2007-11-10 09:09:59 · 11 answers · asked by peachiepie 7 in Astronomy & Space

According to the JERF web site(James Randi Educational Foundation) it will not deposit this million dollars in Escrow, display in cash, or provide proof in any way in advance of a test that the money exists. In fact it doesnt, its in the form of bonds, not cash.
James Randi is a showman, not a scientists. According to James Randi himself, scientists are not qualified to test for Paranormal Proof since they are easily duped.
In the introduction of the rules to his challenge it states, "all tests must be designed in such a way that the results are self evident and no judging process is required! Most scientific research depends on statistical results that need to be anylized by experts to judge the significance of what happened.
The contender has to pay all expenses involved with getting to the JREF and while staying there as well while being tested.
Rule 7 says: when entering this challenge the applicant urrenders any and all rights to legal action against Randi.( do not answer yet

2007-11-10 09:06:57 · 12 answers · asked by nuff said 6 in Paranormal Phenomena

2007-11-10 09:05:12 · 2 answers · asked by Anonymous in Physics

i have a problem to solve for my math class that's related to the logistic equation. I've been unable to come up with a solution:

can you find a number Y(1) such that
Y(1)=Y(3)=Y(5)=...=Y(2n+1)=...
with Y(n+1)=4Y(n)(1-Y(n))?

thanks for the help!

2007-11-10 09:00:41 · 1 answers · asked by Anonymous in Mathematics

2007-11-10 08:56:36 · 2 answers · asked by Anonymous in Chemistry

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