Science & Mathematics - 4 October 2007

2007-10-04 01:21:17 · 1 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-04 01:18:19 · 6 answers · asked by Simon 1 in Other - Science

f(x) = cos(ln x)

2007-10-04 01:16:53 · 3 answers · asked by Anonymous in Mathematics

Why we must blend our sample with that mixture (HPO3-HOAc)?

2007-10-04 01:09:04 · 1 answers · asked by thereddevil_mania 1 in Chemistry

x'' - 3x' + 2x = 0
where x(0)= x and x'(0)= 6

Solution is to be given in the form of a function, using t as variable:
x(t)= ...

2007-10-04 01:03:51 · 4 answers · asked by JP 1 in Mathematics

You are driving to the grocery story at 20 m/s. You are 110 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 s and that your car brakes with constant acceleration.

a. How far are you from the intersection when you begin to apply the brakes?
b. What acceleration will bring you to rest right at the intersection?
c. How long does it take you to stop after the light changes?

Am I supposed to use equations and plug the numbers at the beginning of the question into whichever equations they may be? There are three different kinematic equations for motion with constant acceleration. Would I use one of them. I am not quite sure which to use if I am to use them.

2007-10-04 01:03:17 · 1 answers · asked by Brian 1 in Physics

dx/dt = 2x - 7y
dy/dt = 5x + 10y + 4z
dz/dt = 5y + 2z

Thanks very much! :)

2007-10-04 00:51:31 · 1 answers · asked by Jan R 1 in Mathematics

...... [ 0 6 0 ]
X' = [ 1 0 1 ] X
...... [ 1 1 0 ]
on the interval (-∞, ∞) is
............. [ 6 ] ...................... [ -3 ] ..................... [ 2 ]
X = c_1 [ -1 ] e^(-t) + c_2 [ 1 ] e^(-2t) + c_3 [ 1 ] e^(3t)
.............. [ -5 ] .................... [ 1 ] ...................... [ 1 ]

N.B. : Please ignore the "......"s, plus "_" means subscript, and the three " [ "s (which are to the right of c_1, c_2 and c_3) should actually be one big " [ " (for each term).

Thanks!

2007-10-04 00:46:07 · 2 answers · asked by Anonymous in Mathematics

2007-10-04 00:45:53 · 8 answers · asked by . 1 in Mathematics

2007-10-04 00:44:17 · 15 answers · asked by cleofe pedroso diez 1 in Earth Sciences & Geology

2007-10-04 00:39:58 · 8 answers · asked by elika_isis 2 in Weather

2007-10-04 00:17:54 · 3 answers · asked by The Knowledge Server 1 in Biology

2007-10-04 00:09:23 · 6 answers · asked by elika_isis 2 in Weather

2007-10-04 00:02:11 · 14 answers · asked by christopher l 2 in Zoology