Science & Mathematics - 2 December 2006

A 3.0 m long rigid beam with a mass of 110 kg is supported at each end. An 80 kg student stands 2.0 m from support 1. How much upward force does each support exert on the beam?

Diagram: http://i137.photobucket.com/albums/q208/infinitbelt/p13-56.gif


I tried doing T = -(190 kg)(9.8)(-0.5 m) = 931 but that appears to be the wrong answers for support 2.

Any ideas?


Thanks!

2006-12-02 08:08:40 · 2 answers · asked by Anonymous in Physics

Multiply and then simplify the radical expression:
sqrt(7a) · sqrt13

2006-12-02 08:06:37 · 2 answers · asked by badmf777 1 in Mathematics

Stricly manganese (not manganese oxide). Just manganese

2006-12-02 08:05:53 · 6 answers · asked by Captain_Itunes 1 in Chemistry

CH3 - CH2 - CH - CH3
CH = CH2

The CH = CH2 is connected to the CH in the above line.

I think it is 3 methyl - 4 pentene. Am I right?

2006-12-02 07:53:10 · 6 answers · asked by Anonymous in Chemistry

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i mean so many people are seeing dragons and ufos but not me so for christmas i want a big spaceship to go straight over me and one i say big i mean that triangular one that was in phoenix arizona
that does not try to pick me up

2006-12-02 07:51:49 · 7 answers · asked by Anonymous in Astronomy & Space

I'm doing a science fair project on: 'which color nail polish dries faster/slower than red?' and I've alread done the research part on it, but I'm having trouble on how to start phrasing my background information...any ideas on how to start?



-thanks =)

2006-12-02 07:50:07 · 1 answers · asked by gratisfaction. 5 in Other - Science

is it worth doing?

2006-12-02 07:47:44 · 7 answers · asked by connie 1 in Medicine

An atom has an electron notation that ends 2p6. Which atom is it?
A.helium, He
B.neon, Ne
C.argon, Ar
D.krypton, Kr


Element X has an electron notation that ends with 4s1. Which of the following describes this atom correctly?
A.stable nonmetal
B.stable metal
C.unstable metal
D.unstable nonmetal


Which of the following is a transition metal?
A.barium
B.magnesium
C.lead
D.copper


Atoms which usually become negative ions because they tend to pick up electrons in a reaction are called
A.alkali metals
B.transition metals
C.nonmetals
D.actinoids


What are metalloids?
A.metals
B.nonmetals
C.gases
D.something between a and b

Gold, Au, should have an electron notation that ends in 6s25d9. To become more stable, the electrons in reality rearrange themselves. How do they do it?
A.6s15d5
B.6s25d10
C.6s15d10

2006-12-02 07:45:09 · 4 answers · asked by calebs_baby_girl05 1 in Chemistry

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2006-12-02 07:39:55 · 14 answers · asked by Anonymous in Zoology

A copper block is dragged across a wooden desk by a spring scale. given that the copper block has a mass of 6kg and that the spring scale reads 12N, find the coefficient of kinetic friction.

what would the answer be?

...Thanks

2006-12-02 07:39:20 · 3 answers · asked by knicksfan000 1 in Physics

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The answer is the following

m
______

1 - w

How does this work??? I can't can't remember how to do this. Thnx

2006-12-02 07:29:19 · 6 answers · asked by ekoffman 1 in Mathematics

2006-12-02 07:28:37 · 24 answers · asked by stone 3 in Astronomy & Space

insect A has mass 250g and is moving south at 10.0 cm/s , while insect B is 120g initially moving north at 60.0 cm/s . (Answer must be in Joules)

2006-12-02 07:27:57 · 3 answers · asked by Anonymous in Physics

i get -1 on my calc but my teacher says 1

2006-12-02 07:25:34 · 17 answers · asked by Anonymous in Mathematics

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Just out of random curiosity.

2006-12-02 07:24:31 · 8 answers · asked by Anonymous in Other - Science

i want to see a movie the the tittle is the following: erase una vez en america and has 3 stars ...so i want to know what that means in terms of english

2006-12-02 07:24:12 · 8 answers · asked by sandras77 4 in Engineering

Most people say sodium to mean salt. Are they just shortening the phrase sodium chloride? Or does the body really break salt down into sodium and chlorine? Sodium is a white metal that reacts violently with water. We don't really have sodium in our bodies, do we?

2006-12-02 07:23:51 · 10 answers · asked by sinecat2005 2 in Biology

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i need a fraction answer instead of decimal

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I HAVE A LAN BOY SNOW BLOER WITCH I HAVE NO
WAY TO NO HOW TO RUN IT.

2006-12-02 07:20:50 · 3 answers · asked by Martin 1 in Engineering

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I'm a contact lenses wearer, my eyes are starting too sting every time i use contacts, frankily im sick of them.....i have been thinking of laser eye surgery.....but just not so sure....one thing goes wrong and my eyesight could be lost? Any help on this well appreciated?

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