Science & Mathematics - 25 July 2007

2007-07-25 19:19:55 · 4 answers · asked by Anonymous in Mathematics

one meter. If the tank is turned so that it rests on one of its smallest faces, the depth, in meters, of the water will be:

A: 2/3
B: 1
C: 4/3
D: 5/3
E: 2

2007-07-25 19:18:53 · 4 answers · asked by Anonymous in Mathematics

2007-07-25 19:18:43 · 4 answers · asked by alma g 1 in Mathematics

(x^3+y^3)/(x-y)

i use a calculator but my answer come out wrong why?help me with these problmes please

2007-07-25 19:17:11 · 1 answers · asked by Anonymous in Mathematics

vector a has magnitude of 5.2 unitsand its directed east.vector b has a magnitude of 4.3 units and is directed 35 degree west of north.By constructing vector diagrams,find the magnitude and directions of (a)a+b ,(b)a-b

ans me clearly

2007-07-25 19:16:53 · 1 answers · asked by sara a 1 in Physics

Maximize the function f(x,y) = 3x-y+1 on the ellipse x^2 + 3y^2 = 16 .

Please explain what you are doing so that I can learn this stuff. Thanks.

2007-07-25 19:15:24 · 2 answers · asked by Anonymous in Mathematics

a. Increase installed height of the valve
b. Decrease installed height of the valve
c. Adjust the correct installed height
d. Decrease valve spring pressure to compensate for decreased installed height

2007-07-25 19:14:51 · 3 answers · asked by Anonymous in Engineering

2007-07-25 19:14:01 · 1 answers · asked by John P 2 in Chemistry

help please

2007-07-25 19:13:21 · 5 answers · asked by Anonymous in Mathematics

The question is take the derivative of this:

f(x) = (x^2 + 2x +3)e^-x


I got f'(x) = (2x+2)(e^-x) + (x^2 + 2x +3)(e^-x)'

I know that the derivative of e^x is e^x but what about e^-x?

I thought that it was maybe (-1)(e^-x)

So when I simplified, I got

(-1)(x^2 + 1)(e^-x) but, this was wrong, and I can't figure out why....

2007-07-25 19:10:43 · 4 answers · asked by ahelaumakani 4 in Mathematics

Just curious. Already seen wikipedia so please don't use it. Though I appreciate opinions, I value facts more (so make use of the space for your source) Thanks!!!!!!!!

2007-07-25 19:09:36 · 5 answers · asked by Anonymous in Chemistry

2007-07-25 19:07:58 · 10 answers · asked by Anonymous in Mathematics

2007-07-25 19:05:03 · 2 answers · asked by abad n 1 in Earth Sciences & Geology

If there is an abnormality in the orbiting and tilting of earth, how it affect the climate?

2007-07-25 19:04:39 · 2 answers · asked by fe v 1 in Earth Sciences & Geology

2007-07-25 19:00:10 · 2 answers · asked by Curious Appu 1 in Engineering

So we know that if an ice cube floating in water was to melt completely, the water level would still remain the same as it was when the cube was floating in it. In that case, why does the hole in the ozone layer cause the water levels to rise? If I understand corrently, the hole is close to the North pole, and the Arctic is just floating icebergs (if it were a continent like Antarctica, then the rising water levels would make more sense). This has been bugging me for a while... Thanks!

2007-07-25 19:00:04 · 6 answers · asked by snowwind_7 2 in Weather

x + y + z = 9
w + y + z= 5
w + x = 2

what is the average of w, x , y, and z?

(a) 0
(b) 1
(c) 2
(d) 3
(e) 4

2007-07-25 18:56:41 · 5 answers · asked by Anonymous in Mathematics

An electric field passes through a dielectric medium....lets consider its intensity to be "Z". When this field passes through a dielectric medium what will be its intensity when it emerges out of the dielectric medium; just outside this medium?...in other words....what will be the intensity left when it move out of the medium on the other side?

Z/K?...where K is the dielectric constant

2007-07-25 18:56:15 · 1 answers · asked by Anonymous in Physics

some answer to my question about the xpansion of the unievrse why we can see our nearest stars like proxima cent.tha this stars and our star pulled each other by gravty;is proxima revolving our sun;or our sun revolving proxima ./from marl26gil@yahoo.com

2007-07-25 18:52:49 · 5 answers · asked by Marlou G 1 in Astronomy & Space

2007-07-25 18:51:40 · 9 answers · asked by jonathan b 1 in Mathematics

modal analysis of crankshafts using ANSYS,free vibrtation analysis

2007-07-25 18:49:26 · 2 answers · asked by RAMPAL 1 in Engineering

Here is your options:
A. y= 2x-4
B. y= -2x+3
C. y= 3x-2
D. y= -4x+2

2007-07-25 18:48:55 · 6 answers · asked by grimstar8402 2 in Mathematics

The combustion of titanium with oxygen produces titanium dioxide:

Ti(s) +O2(g) yields TiO2 (s)

When 0.071g of titanium is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25.00 degrees C to 53.80 degrees C. In a separate experiment, the heat capacity of the calorimeter is measured to be 9.98KJ/K. The heat of the reaction for the combustion of a mole of Ti in this calorimeter is....

2007-07-25 18:38:23 · 1 answers · asked by Anonymous in Chemistry

can you please explain how?

2007-07-25 18:34:48 · 5 answers · asked by weee 1 in Mathematics

how does light travel through the eye? use the majot structures of the eye to explain!

2007-07-25 18:28:25 · 5 answers · asked by Anonymous in Astronomy & Space

The vaule for delta H degree for the reaction below is -336KJ. Calculate the heat (KJ) released to the surroundings when 23.0g of HCl is formed.

CH4(g) + 3Cl2 (g) yields CHCl3(l) +3HCl (g)

Please show your work.

2007-07-25 18:24:36 · 1 answers · asked by Anonymous in Chemistry

consider weight of cage is x
weight of the bird is y

Would the weight sum up both

2007-07-25 18:23:08 · 8 answers · asked by Anonymous in Physics

CH4 + 3Cl2 ----> CHCl3 + 3HCl
^H degrees for the reaction is -336KJ. How do you calculate the heat when 23.0g of HCl are formed?

2007-07-25 18:20:33 · 2 answers · asked by Matthew H 2 in Chemistry

2007-07-25 18:19:51 · 1 answers · asked by Anonymous in Chemistry

The sampaguita plant's stem seems so soft. Does it have a bark or any outer layer?

2007-07-25 18:18:56 · 1 answers · asked by F 1 in Botany