Science & Mathematics - 22 August 2007

The density of benzene at 15 C is .8787 g/mL. Calculate the mass of .1500L of benzene at this temperature? What are the steps to do this?

Also.... The density of titanium metal is 4.51g/cm3 at 25 C. what mass of titanium displaces 68.8mL of water at 25 C?

2007-08-22 10:33:32 · 3 answers · asked by john s 3 in Chemistry

My colleague bought a nice looking ring off of e*Bay, the seller claims it is 22 karat gold. He only wound up paying $29 dollars for the ring and I say that is just not possible. I felt the ring, and it feels like about 15 grams. And, it does indeed look like 22 karat gold but there is no bullion mark stamped inside. If somehow this was real gold, I would think my friend might be interested in trying to resell it at a higher price. But how can you determine if it is real? I don't think going to a geologist for some sort of an assay is an option. Are there any tell-tale things that can be spotted with a loupe perhaps, that would tip someone off it is real?

2007-08-22 10:32:55 · 12 answers · asked by hegottahaveit 1 in Earth Sciences & Geology

2007-08-22 10:31:18 · 8 answers · asked by Red 2 in Mathematics

I need to see a medium/clairvoyant that can be recommended and that isnt too costly in the York area or surrounding areas (north yorks) Preferably one that you have had a good experience with and that you personally would recommend?

2007-08-22 10:30:30 · 21 answers · asked by Anonymous in Parapsychology

m= y2-y1/ x2-x1 is the formula

(4,5) & (-1,2) so, wouldn it be:
2-5 = -3 =3
------ -- --
-1-4 -5 5

also y=2x don't you just divide y out of the equation?

y=2x
-- --- = 2? since y = 2x, then 1/2y =x
y y

finally 11=5x-9y
i'm lost on this one.

2007-08-22 10:28:56 · 3 answers · asked by shayne t 2 in Mathematics

Evolution that involves changes in a species over time to produce adaptations that allow the organism to better survive its environment is ______________.

Microevolution

Macroevolution

Both A and B

None of the above

2007-08-22 10:24:05 · 9 answers · asked by Anonymous in Biology

2007-08-22 10:23:48 · 3 answers · asked by Raheel A 1 in Weather

2007-08-22 10:23:01 · 10 answers · asked by Anonymous in Astronomy & Space

2007-08-22 10:21:19 · 2 answers · asked by nigga w 1 in Mathematics

2007-08-22 10:21:01 · 4 answers · asked by Sin_o66 1 in Engineering

I know that many animals are burroweres, but i need more adaptations...

2007-08-22 10:18:46 · 0 answers · asked by KC 1 in Zoology

2007-08-22 10:18:28 · 11 answers · asked by i 1 in Earth Sciences & Geology

2007-08-22 10:18:23 · 7 answers · asked by kristen c 1 in Mathematics

2007-08-22 10:17:37 · 5 answers · asked by Red 2 in Mathematics

I know it may sound dumb, but is there any possible way to set up a lightning rod and connect it to something that could capture the energy from the strike and reuse it for consumer use?

2007-08-22 10:17:09 · 6 answers · asked by Willdawg3 2 in Engineering

Dierections:Use the distributive property to simplify each expresion.
1) 9x (5+3) x 4 - 6=

2) (8+7) x 3 x 2=

Use the disruptive property to multiply mentaly!

1) 7x 57=
2) 8x 97=
3)5x 402=
4) 8x 103=
5) 9x 213=
6) 7x 49=

GOOD LUCK TO ALL REMEMBER I WILL GIVE U TEN POINTS IF U R RIGHT SEE YA!!!!!!!!!!!

2007-08-22 10:15:57 · 9 answers · asked by Anonymous in Mathematics

2007-08-22 10:13:23 · 8 answers · asked by morris w 1 in Mathematics

2007-08-22 10:13:10 · 10 answers · asked by Anonymous in Physics

I need to check my answers and I'm not sure I got them right. If you could please explain...?

QUESTION 1:
Solve the equation. Check your solution. (sqrt)r + 5 = 11
a) 126
b) 6
c) 17
d) 116


QUESTION 2:
If the password to get into a garage is four numbers long, and you can only use the numbers one through nine, how many different passwords would there be?
a) 3024
b) 6561
c) 36
d) 4


QUESTION 3:
Suppose the area of a square is x^2 - 6x + 9. What is the perimeter of the square?
a) x-3
b) 2x-6
c) 4x-12
d) x+3


QUESTION 4:
Simplify the expression. 4(sqrt)7 + 8(sqrt)63
a) 76(srt)7
b) 12(sqrt)63
c) 28(sqrt)7
d) 28(sqrt)63

QUESTION 5:
How many real roots are there for the equation: x^2 + 4x - 1 = 0
a) 0
b) 1
c) 2
d) 4

2007-08-22 10:04:29 · 3 answers · asked by song_fiend 2 in Mathematics

2007-08-22 10:01:07 · 2 answers · asked by Anonymous in Zoology

log (base=a) (argument=a) (exponent of argument=x)
and a^(log (base=a) (argument=x)

What are the restrictions on "a" and "x"?

if you're not sure with the terminology:
ex. log x ---> base=10 argument=x

2007-08-22 10:00:55 · 2 answers · asked by Anonymous in Mathematics

I find it depressing that it's so cold here. How do I cope or adapt?

2007-08-22 10:00:02 · 5 answers · asked by karipap ayam m 1 in Weather

This summer i wished that me and my friends would be in the same classes. It came true, but we don't hang out anymore. And I wished for a boyfriend but now im going with a guy that i see as a brother. Isnt that weird that they all came true but they went wrong?

2007-08-22 09:56:49 · 11 answers · asked by Anonymous in Paranormal Phenomena

Many quantum physicists spend their lives validating this point ... but why? What purpose would it serve us to know, anyway? Would it improve the quality of life we live in now?

Or is it just one of those curiosities ...

2007-08-22 09:52:50 · 7 answers · asked by Anonymous in Physics

2007-08-22 09:51:09 · 3 answers · asked by Anonymous in Geography

like, the focal point or whatever.

[in other words, if the earth was flat we would see farther across the ocean because it wouldnt bend down, right?]

?

2007-08-22 09:48:45 · 4 answers · asked by Anonymous in Other - Science

2007-08-22 09:46:48 · 1 answers · asked by neeka l 1 in Geography

Is the existance of black holes impossable because it causes velocities to exceed the limit of light speed?
Or
Do we need to revise the physical laws because we know that black holes really do exist?

2007-08-22 09:46:18 · 5 answers · asked by everymansmedium 2 in Physics

identify the axis of symmetry, create a suitable
table of values, and sketch the graph (including the axis of symmetry).
y=-x^2+6x-2

2007-08-22 09:46:02 · 2 answers · asked by Anonymous in Mathematics

2007-08-22 09:45:31 · 11 answers · asked by Anonymous in Astronomy & Space