Science & Mathematics - 29 September 2007

my goal is to get 90%
but i havent started well
i got 6 /10 on the quiz
68% on the unit test
and 14/15 for the experiment
please help me improve

2007-09-29 15:29:28 · 2 answers · asked by king of soccer 1 in Physics

If y is directly proportional to the square of x, and x=2 when y=12, then what is the value of y when x=3?


Thanks!

2007-09-29 15:27:46 · 5 answers · asked by Asa 1 in Mathematics

2007-09-29 15:26:00 · 1 answers · asked by Weedman 3 in Mathematics

why is the bermuda triangle so famous? does any one know about the scientific justifications to what happens over there?

2007-09-29 15:26:00 · 8 answers · asked by SHAHAZAD SHAIKH 2 in Earth Sciences & Geology

The equation of motion of a particle, where s is in meters and t is in seconds, is given by the equation below.
s = 7 t 3 - 9 t
(a) Find the velocity and acceleration as functions of t.
v(t) 21t^2-9
a(t) 42t

acceleration at t 3
126m/s

what is the acceleration when velocity is at 0?
is this zerp as well? or how would I get this?

2007-09-29 15:23:37 · 4 answers · asked by m_carl 1 in Mathematics

A pebble is dropped in a lake and it produces ripples with a frequency of 0.25Hz. When should a second pebble be dropped at the same place to produce destuctive interference?

a. 0.50 s after the first
b. 0.75 s after the first
c. 1.0 s after the first
d. 1.5 s after the first
e. 2.0 s after the first

Thanks :)

2007-09-29 15:21:51 · 1 answers · asked by Corian 2 in Physics

just curious :)

2007-09-29 15:21:02 · 10 answers · asked by Alyssa 2 in Biology

solve by linear combination

2007-09-29 15:13:42 · 8 answers · asked by MarieKatie 1 in Mathematics

i'm doing a lab report so one of the topics is to explain the formula to find density. I know it's a ratio, but i need for information besides that. Thank you!

2007-09-29 15:11:25 · 9 answers · asked by osomi_m 2 in Physics

Divide 15 into two parts such that when the larger is divided by 3 and the smaller is divided by 2, the quotients are equal.
thx 4 answering!!!

2007-09-29 15:08:53 · 5 answers · asked by Platinum. 1 in Mathematics

#1. 3 sqrt x^2y^3
#2. 4 sqrt 2

2007-09-29 15:07:18 · 2 answers · asked by white tea 1 in Mathematics

suggestions..?

2007-09-29 15:05:06 · 6 answers · asked by fer 2 in Medicine

for every positive integer n

where (n+1) and so on are indices.

2007-09-29 15:03:16 · 3 answers · asked by Joe 1 in Mathematics

Can someone explain how to do a problem like this?
Which of the following pairs would have the greatest coulombic attraction in a solid compound?
1. mg2+, S2-
2. mg2+, se2-
3.mg2+, O2-

2007-09-29 15:02:48 · 3 answers · asked by michelle 1 in Chemistry

2007-09-29 15:02:03 · 5 answers · asked by chantol w 1 in Biology

I am stumped as to how to solve for x in:

3/2 = x - (49/2x)

2007-09-29 15:01:24 · 5 answers · asked by Chris R 1 in Mathematics

a^2=b^2+c^2-2bccosA

please how to proof

2007-09-29 15:00:46 · 3 answers · asked by Anonymous in Mathematics

"Many of the students, noted the researchers, said that when they had proposed to take pressures according to AHA guidelines, they were "corrected" -albeit improperly - by their mentors."

2007-09-29 15:00:46 · 5 answers · asked by Anonymous in Medicine

The chemical equation in words is:
perchloric acid (HClO4) (aq) + tetraphosphorus decaoxide (s) yeilds phosphoric acid (aq) + dichlorine heptaoxide (g),

I think that it is this before it is balanced....( the underscores are used to show that the number between is a subscript.)

HClO_4_ +P_3_O_10_ yeilds H_3_PO_4_+ Cl_2_O_7_

2007-09-29 14:53:47 · 2 answers · asked by SweetMandy01234 2 in Chemistry

Why does adding 6M NaOH to the red solution tend to make it turn back yellow?

2007-09-29 14:52:48 · 2 answers · asked by ballababy0520 1 in Chemistry

When you cut this open there is a seed the size of a peach pit and is black. Inside is yellow and stains your fingers.

2007-09-29 14:41:01 · 3 answers · asked by nineoneonegal85 1 in Botany

2007-09-29 14:37:10 · 8 answers · asked by Anonymous in Astronomy & Space

How long does it take the car to cover this distance? What equation should i use and how can i show my work? Thanks to all who answer!!!

2007-09-29 14:36:47 · 3 answers · asked by cooldude123 2 in Physics

Why space has something to do with TIME? How does space something to do with time or time has something to do with space?

2007-09-29 14:28:43 · 9 answers · asked by Agent JipST 3 in Astronomy & Space

f(x)=X+2cos(x)

find points at which the tangent line is horizontal

2007-09-29 14:25:34 · 2 answers · asked by deadman 2 in Mathematics

f(x)=csc(x)+sec(x), 0
find the points at which the tangent line is horizontal

2007-09-29 14:24:11 · 1 answers · asked by deadman 2 in Mathematics

2007-09-29 14:20:43 · 0 answers · asked by nVerro 3 in Geography

2007-09-29 14:18:58 · 11 answers · asked by Anonymous in Mathematics

I'm trying to convert 3,700 mL into L's.
Would my decimal point be behind the number after the last zero, or will it be where the coma is????
I can't remember! Please help!

2007-09-29 14:18:48 · 8 answers · asked by Anonymous in Mathematics

2007-09-29 14:18:32 · 6 answers · asked by Anonymous in Geography