Science & Mathematics - 2 February 2007

Lance Armstrong bikes at a constant speed up the Alpe d'Huez, a famous mountain pass. Assume his teammates do such a good job riding ahead of him that he can draft behind them and encounter no air resistance. This climb is described as "beyond classification" in terms of its difficulty. The climb is 13.8 km long at a 7.9% average grade (the grade, as a decimal, is the tangent of the angle of inclination). Assume that the combined mass of Lance and his bicycle is 83 kilograms. What is the magnitude of the work he does against the force of gravity?

2007-02-02 14:44:23 · 5 answers · asked by venom90011@sbcglobal.net 1 in Physics

2007-02-02 14:42:39 · 3 answers · asked by mayling 1 in Physics

how much?

2007-02-02 14:42:04 · 19 answers · asked by Anonymous in Weather

2007-02-02 14:39:11 · 2 answers · asked by AlexTan 3 in Physics

2007-02-02 14:38:03 · 7 answers · asked by AlexTan 3 in Physics

I am completely stumped on this question. It's from a test I already did, so this is for curiosity, not for someone else to do my homework.

If a company is building 478 houses and stand to profit $15,000 from a 2 bedroom model and $16,000 from a three bedroom model, and they are seeking to make exactly $5,713,000 in profit, how many of each house do they need to make?

Could someone show me how to solve this. I don't even care if you give me an answer, just let me know how to do it myself.... The answer must be numbers, not formulas. I just don't get how to solve it.

2007-02-02 14:34:41 · 12 answers · asked by Wren 3 in Mathematics

I read in a sci-fi novel that if one end of a tungsten rod is heated, and the other is chilled, there will be an apreciable electical current along the length. And, with a very, very large beam of tugsten, you can sink one end in a deep body of water, put the other end in a green house on the surface, and draw off the current by a wire in the middle. Voila! "Free" energy.

Of course, i have no idea if this is even vaguely factual. That's where you come in.

2007-02-02 14:33:42 · 2 answers · asked by juicy_wishun 6 in Chemistry

1.) Why is there no base-centered cubic lattice listed with the Bravais lattices?

2.) Under what conditions does the triclinic system reduce to the hexagonal system?

3.) Under what conditions does the monoclinic syste reduce to the orthorhombic system?

2007-02-02 14:33:26 · 1 answers · asked by womfalcs7 2 in Other - Science

Question 1: Find the exact numerical value of

2sin^2 60°+tan^2 30°-cos 45°

Question 2: Simplify the following expressions:

a) sin A. cos (180°- A). cos (90° + A)

b) cos (90°+q). sin(90°-q) + sin (90°+q). cos (90°-q)

note: the q is an (unknown I think) angle symbol the one with the oval with the line through the middle of it).

c) sin (180° - x). cos x ¸(divide by, large line separating both lines)
tan (180° - x)

Question 3:Use your calculator to evaluate the following correct to 2 decimal places (I haven't got my graphics calculator with me...long story)

a) sin58.7°
b) tan 31°8'
c) cos(-73°42' )

Question 4: Answer true or false to each of the following:
a) sin^2a= (sin a)^2
b) sin^2 41°+cos^2 41°=1
c) tan 53°12' = 1.33 (correct to 2dp)
d) cos (10°+30°)=cos 10°+cos 30°
e) cos (90°- x)=sin x

Thankyou for your help. Please write down which each working and answer is for clearly (question 1, 2, 3 or 4 and a, b, c etc).

2007-02-02 14:32:24 · 2 answers · asked by Anonymous in Mathematics

There are a lot of exotic theories floating around for future star travel: ion drive (slow, but reliable); solar sails; laser propulsion; nuclear fusion drives. None of these are phony "Star Trek" warp drives (doesn't make ANY scientific sense--they'd be crushed to death!), but which one is the most feasible?

2007-02-02 14:27:03 · 14 answers · asked by Anonymous in Astronomy & Space

2007-02-02 14:27:02 · 3 answers · asked by Anonymous in Mathematics

Not sure how to spell it but it's pronounced val-yoom. I watched Girl,Interrupted tonight and Brittany Murphy's character Daisy kept wanting certain drugs and she said something about a valium and I wanted to know what it is and what it does? Thanks :)

2007-02-02 14:26:35 · 8 answers · asked by Anonymous in Medicine

Even though its only a tiny alcohol percentage i'm guessing thats all they need to get wasted?
What do you think?

2007-02-02 14:25:27 · 17 answers · asked by lukeee 3 in Medicine

Hurry, are there coyotes in the zoo.?

2007-02-02 14:20:44 · 11 answers · asked by Stephanie C 2 in Zoology

2007-02-02 14:20:41 · 6 answers · asked by Mr.YES-MAN 2 in Astronomy & Space

2007-02-02 14:20:38 · 7 answers · asked by freedb123 2 in Other - Science

2007-02-02 14:19:48 · 6 answers · asked by Anonymous in Mathematics

make it at least ten digits past the decimal mark please

2007-02-02 14:18:00 · 7 answers · asked by Grammar B*@%h 4 in Mathematics

For example: Just look at what happened in Boston. It was on 1/31/07 right??? take 1 from 31 and then subtract 7. 23... thats weird

2007-02-02 14:16:25 · 16 answers · asked by Chadwick 2 in Mathematics

My grandparents live in Ocala. I tried to call them, but no answer. Was Ocala in the same area as the storm?

2007-02-02 14:16:04 · 4 answers · asked by CherBear 3 in Weather

do you have one tornado or 3 ask you ?

2007-02-02 14:15:55 · 2 answers · asked by wether kid 1 in Weather

Clue It is in the United State's of America.

2007-02-02 14:12:40 · 5 answers · asked by Unoptrid1aq 4 in Earth Sciences & Geology

Cause my sister lives in Spring hill and i have tried calling but all's i get is a busy signal and she hasn't been on the computer in 3 days. do you know for sure where it hit? and if it hit Spring hill?

2007-02-02 14:11:24 · 6 answers · asked by Anonymous in Weather

2007-02-02 14:11:02 · 14 answers · asked by garey h 1 in Geography

2007-02-02 14:09:13 · 5 answers · asked by Anonymous in Mathematics

2007-02-02 14:08:50 · 5 answers · asked by Anonymous in Weather

LIke do they think like us but since they dont have hands the cant show how intellliegent they are.

2007-02-02 14:02:36 · 6 answers · asked by Anonymous in Zoology

2007-02-02 14:01:28 · 7 answers · asked by Anonymous in Mathematics

Which would give a patient the best care?

2007-02-02 14:00:50 · 4 answers · asked by osunumberonefan 5 in Medicine

I need to know what minerals are related to the mineral jade

2007-02-02 14:00:50 · 3 answers · asked by ♥Team Edward♥ 2 in Earth Sciences & Geology