Science & Mathematics - 7 October 2007

write as a decimal

2007-10-07 11:58:57 · 11 answers · asked by Ladii Fanatic 1 in Mathematics

A force f vector = (4x i + 4y j ) N acts on an object as it moves in the x direction from the origin to x = 5.06 m. Find the work W = integral( f vector·dr ) done by the force on the object.

2007-10-07 11:53:04 · 1 answers · asked by rock it ! 1 in Physics

How many moles of bromine are in 2.60 £ 102
grams of bromine?
1. 0.0152 mol
2. 0.308 mol
3. 10.5 mol
4. 3.25 mol
5. 2.29 mol
6. 48.6 mol
7. 79.9 mol

2007-10-07 11:48:59 · 4 answers · asked by macaleen00 1 in Chemistry

how can i and is there more than one answer if there is say so and list

2007-10-07 11:46:35 · 4 answers · asked by Steffi loves Bob!!! 1 in Mathematics

How many mols NaOH to neutralize 1 mol KHP, Potassium hydrogen phthalate

2007-10-07 11:45:12 · 2 answers · asked by Theava 2 in Chemistry

hey i am having trouble can someone help...

1.)Water flows from a hose at 15 gallons a minute. How long does it take to fill up a 300 galllon pool?

2.) There are 26 shoes in a closet. Some of the shoes are nike the rest are Adidas. The nikes cost 50 and the adidas are 60...the total price of all shoes are 1400. Find the number of nikes and adidas.... HELLPpPP!

2007-10-07 11:42:46 · 12 answers · asked by lovboi98765 1 in Mathematics

why do I never see baby squirrels

2007-10-07 11:41:27 · 8 answers · asked by Anonymous in Zoology

Christopher can paint the interior of his house in 15 hours. if he hires cynthia to help him, they can do the same job together in 9 hours. if he lets cynthia work alone, how long will it take her to paint the interior of his house?

I know the answer- 22.5 hours. . but please explain how you get that answer!!!

2007-10-07 11:39:48 · 4 answers · asked by lalalallalalllal 2 in Mathematics

Chrominium Isotope data

Isotope---Percent abundance----Mass(amu)
Cr-50----4.35%----------------... 49.946
Cr-52----83.79%---------------... 51.941
Cr-53-----9.50%---------------... 52.941
Cr-54-----2.36%---------------... 53.939

2007-10-07 11:38:25 · 1 answers · asked by Anonymous in Chemistry

Is it the same as an atomic number? I'm confused

2007-10-07 11:38:15 · 5 answers · asked by Griffin M 2 in Chemistry

which direction does the dumb nile river flow!!!!!!!!!!

2007-10-07 11:36:50 · 19 answers · asked by Anonymous in Geography

2007-10-07 11:35:42 · 1 answers · asked by Michaela R 1 in Botany

Consider the reactions shown below.

5 Fe2+ + MnO4- + 8 H+ ---> 5 Fe3+ + Mn2+ + 4 H2O
5 NO2- + 2 MnO4- + 6 H+ ---> 2 Mn2+ + 5 NO3- + 3 H2O

a) What is the molarity of KMnO4(aq) if 25.55 mL KMnO4(aq) is required to titrate 14.00 mL of 0.2334 M FeSO4(aq)?

b) What is the molarity of KMnO4(aq) if a 552.4 mg sample of KNO2 requires 32.61 mL KMnO4(aq) for its titration?

2007-10-07 11:35:17 · 2 answers · asked by unknownanonymous999 2 in Chemistry

A 2.00% NaOH solution by mass has a density of 1.054 g/mL. What is the minimum molarity of an HCl(aq) solution that can be used to titrate a 4.00 mL sample of the NaOH(aq) if the titration is to be accomplished without having to refill a 50.00 mL buret used in the titration?

2007-10-07 11:33:37 · 2 answers · asked by unknownanonymous999 2 in Chemistry

i live in the mid west and it is hot then cold now its hot and its fall

2007-10-07 11:33:01 · 9 answers · asked by Anonymous in Weather

a) Aluminum reacts with KOH and water forming potassium ions, [Al(OH04]- and hydrogen gas.

b) hydrogen ions from the acid react with the tetrahydroxoaluminate ions to precipitate aluminium hydroxide.

c) Aluminium hydroxide reacts with addition hydrogen ions and water to form [Al(H2O)6]3+.

d) Alum forms from the potassium ions, hydrated aluminium ions, sulfate ions and water.

Thank you.

2007-10-07 11:32:25 · 4 answers · asked by Anonymous in Chemistry

Why are we traveling to other planets when we haven't even discovered everything on our own planet?

2007-10-07 11:32:04 · 16 answers · asked by Tim Buck 5 in Astronomy & Space

i have a severe b12 deficency,i had proton radiation a year ago so that might be the cause but i have trouble eating meat,i wasnt always like that but looking at meat makes me sick also eggs,fish and milk,so that might be the cause also. is there anything like over the counter pills or any good food i cake take to get a good amount of b12??

also i have to get a b12 shot once a week for a month,i was wondering where do they inject the shot,it better not be the butt!

2007-10-07 11:31:03 · 6 answers · asked by molly 1 in Medicine

A 9.00 mL sample of an aqueous solution of H2O2 is treated with an excess of KI(aq). The liberated I2 requires 44.93 mL of 0.5022 M Na2S2O3 for its titration. Is the H2O2(aq) up to full strength (3% H2O2 by mass) as an antiseptic solution? Assume that the density of the H2O2(aq) is 1.01 g/mL.

H2O2(aq) + H+ (aq) + I -(aq) ---> H2O(l) + I2(s) (not balanced)

I2(s) + S2O32-(aq) ---> S4O62-(aq) + I - (aq) (not balanced)

2007-10-07 11:30:38 · 2 answers · asked by unknownanonymous999 2 in Chemistry

and you exert a force F on the free end of the cord.
(a) What must be the magnitude of F if you are to lift the canister at a constant speed?
N
(b) To lift the canister by 2.6 cm, how far must you pull the free end of the cord?
cm
(c) During that lift, what is the work done on the canister by your force (via the cord)?
J
(d) What is the work done on the canister by the gravitational force on the canister?
J

2007-10-07 11:29:23 · 1 answers · asked by Wonder 2 in Physics

Like when you have x and a and stuff.

z- 5z = 7z - 9 - z.

[[I made up that equation]].

What is the first thing to do alway down to the last thing?

You can like list it so that I'll get a better understanding, like:

1. step 1
2. step 2

and so on.

thnx=)

2007-10-07 11:27:37 · 5 answers · asked by Anonymous in Mathematics

Do you have to convert mL to g in this problem. If so, I know that you use D=M/V but not sure how that fits into the overall answer.

2007-10-07 11:27:13 · 1 answers · asked by Emerson 5 in Chemistry

I'm in in high school taking alg.2,I'm having trouble with one problem for homework, so how do you solve 6(3x-2)-2(5x=1)=22
the answer I got was 4 1/2, but someone said its wrong so can someone help me check it and tell me the answer you get?

2007-10-07 11:27:08 · 11 answers · asked by zahyra33 2 in Mathematics

Don't worry....it's not a homework question. It's a practice question for a test. But, here's the equation: 2/3x= -8.
How do I get the answer for this. I got -16/3, but I'm sure that's not correct haha.

thnx=]

xoxox

2007-10-07 11:23:49 · 6 answers · asked by Anonymous in Mathematics

55kg person rides a bike with all her weight on each pedal while climbing a hill.the pedals have a 17 cm radius, what is the max torque? how could she exert more?

2007-10-07 11:22:24 · 2 answers · asked by Richard Gozinya 2 in Physics

A small mass m is set on the surface of a sphere. If the coefficient of static friction is µs = 0.86, at what angle would the mass start sliding?
I have no idea how to approach this...please help
and thank you in advance

2007-10-07 11:19:43 · 1 answers · asked by hermionegranger 2 in Physics

What are two possible sources of simple organic compounds on the early Earth?

2007-10-07 11:18:36 · 3 answers · asked by Shayna 2 in Biology

omg. I need a scenario for linear equations by tomorrow or i'm dead. I'd do it myself but i really don't understand it. I've been trying to do it since friday and still nothing. So if anyone can help i'd be Really Really Really Really Really Really Grateful.

2007-10-07 11:18:34 · 3 answers · asked by dog_chief_inu 2 in Mathematics

Can someone show me the steps? thanks

2007-10-07 11:14:37 · 7 answers · asked by RoseTears 1 in Mathematics

my project is growing two plants with fifferent types of soils

2007-10-07 11:14:23 · 1 answers · asked by ashley 1 in Botany