Science & Mathematics - 30 October 2007

A rocket moves striaght upward, starting from rest with an acceleration of 29.4m/s^2. It runs out of fuel at the end of 4.00seconds and continues to coast upward, reaching a maximum height before falling back to Earth.

(a) Find the velocity the instant before the rocket crashes on the ground.





Not sure how to do this. Can anyone help walk me through it??
Thanks <3<3<3

2007-10-30 09:23:20 · 2 answers · asked by SurferGirl9 1 in Physics

The Earth was completely chinese/japanese.. (there design, way of life, outrageous fantasy creations, crazy concepts) ECT, ECT! =oD

Just a thought...

2007-10-30 09:23:11 · 6 answers · asked by Anonymous in Astronomy & Space

If the universe started with a big bang, then wouldn't entropy apply? If it applies then that would mean that the universe is stable, because it is less organized. (Be patient with me) So, aren't things that are less stable have to become stable again at some point? What prevents the universe to not return back to its unstable more organized state?

Unless of course the universe is becoming stable and unstable constantly.

2007-10-30 09:22:53 · 4 answers · asked by Anonymous in Astronomy & Space

Why was mercury used in early barometers instead of another liquid?

2007-10-30 09:22:13 · 5 answers · asked by liltchaser 2 in Physics

calculate the frequencey and wavelength (nm) of the emitted photon when an electron drops from the n=4 to the n=2 level in a hydrogen atom?

2007-10-30 09:18:40 · 1 answers · asked by lacie_23_07 1 in Chemistry

A shipping box is a rectanglular solid whose volume is 4ft^3. The length of the box is twice its width. The material to make The top and bottom costs $.30/ft^2 and the material for the sides costs $.20/ft^2. Find the dimensions of the box that will minimize the costs.

2007-10-30 09:17:24 · 1 answers · asked by Teresa 2 in Mathematics

Solve the system of equations using Cramer's rule

x1 + 2x2 + x3 = 3
x1 + x2 - x3 = 4
2x1 - x2 + x3 = 5

2007-10-30 09:14:27 · 4 answers · asked by iznissin 1 in Mathematics

A projectile is fired at an upward angle from the top of a 105 m cliff with a speed of 185 m/s. What will be its sped when it strikes the ground below?(Use conservation of energy and neglect air resistance.)

2007-10-30 09:11:41 · 3 answers · asked by matt c 1 in Physics

need to make my appliance work here without blowing it up?

2007-10-30 09:11:40 · 10 answers · asked by poo 2 in Engineering

Find dy/dx by implicit differentiation.
1+x=sin(xy^2)

i worked it out and got as far as
1=cos(xy^2)(y^2+2xy)(dy/dx)....i tried to simplify it and got
2xy((1/cosxy^2)-y^2) but i got it wrong

2007-10-30 09:10:33 · 2 answers · asked by lady_divine@sbcglobal.net 1 in Mathematics

Sheby has a 40% chance of making a free throw. What is the probability that she will miss the free throw?

2007-10-30 09:09:08 · 11 answers · asked by Rebecca M 1 in Mathematics

a, Prove that if A is an n x n matrix, then B = A+A' is symmetric

b, Prove that if A and B are n x n symmetric matrices, then AB is symmetric if and only if AB = BA

2007-10-30 09:08:47 · 2 answers · asked by iznissin 1 in Mathematics

how do you separate salt water from fresh water

2007-10-30 09:04:49 · 3 answers · asked by Anonymous in Chemistry

Its a conditional statement
For example if M<7 = 135 degrees, then M<1 = ?.

OR

If M<11 =190 degrees, then M<8 = ? .

In my math book it says you can find the measure of all angles if you know the angle of just ONE angle. It doesn't explain how to do it though. Can someone please help?

2007-10-30 09:02:28 · 5 answers · asked by Anonymous in Mathematics

10 points for best answer-i keep getting mixed up on what they are. can you please help me? thanks

2007-10-30 09:00:51 · 11 answers · asked by ♥megan♥ 2 in Astronomy & Space

or solve x^x=y in general

2007-10-30 08:58:41 · 4 answers · asked by gamer79 g 1 in Mathematics

2007-10-30 08:56:40 · 2 answers · asked by earlynightmare 1 in Mathematics

ok people. i have looked into my textbook, i have read over my notebook, and i cant understand these 4 problems!!!

* 25% of what is 28
*what is 20% of 650
*what percent of 210 is 0.15
*what is 150% of 26

can you please explain how you do these. if you explain, i can solve!

THANK YOU SOOOOO MUCH! my teacher is going to kill me if i dont have these done!

JJ Smithson

2007-10-30 08:56:09 · 29 answers · asked by Anonymous in Mathematics

http://i5.tinypic.com/4r1o407.jpg

Two pucks slide down inclined plane.
Puck A starts from rest.
Puck B is given initial sidewise velocity
(that is in horizontal direction) Vo = 5m/s.

Which puck will reach the bottom (marked as blue line) faster?

2007-10-30 08:53:35 · 1 answers · asked by Alexander 6 in Physics

If quasars are supermassive black holes at the center of young galaxies, as many scientists seem to be saying, what happened to them? How could they disappear?

2007-10-30 08:52:27 · 5 answers · asked by Yaakov 6 in Astronomy & Space

2007-10-30 08:52:03 · 7 answers · asked by Anonymous in Paranormal Phenomena

2007-10-30 08:49:19 · 2 answers · asked by Anonymous in Earth Sciences & Geology

using a huge magnet on a rocky surface on earth and pluto to bring it closer to study and discover but then send it out once your done.

2007-10-30 08:44:29 · 9 answers · asked by felton_zach 2 in Astronomy & Space

?

2007-10-30 08:41:53 · 2 answers · asked by sokhead93 1 in Earth Sciences & Geology

2007-10-30 08:41:23 · 3 answers · asked by Tonya R 1 in Astronomy & Space

Why do all the psychics on TV have English accents? Aren't any of them American?

2007-10-30 08:37:55 · 13 answers · asked by Anonymous in Paranormal Phenomena

Find turning point, rel. minimum or max., and point of inflection for:

f(x)=x^2-4/x

and

g(x)=1/3x^3-x^2+x-3

Thanks in advance!

2007-10-30 08:37:38 · 1 answers · asked by Anonymous in Mathematics

Is there anyone in or around Kansas City MO who would like to join a paranormal investigation team. If so please email me at contact@rebeccadesmond.com

2007-10-30 08:37:13 · 2 answers · asked by pipesean 2 in Paranormal Phenomena

What is comprehensive theory of communication difination

2007-10-30 08:35:58 · 1 answers · asked by somaya 1 in Engineering

2007-10-30 08:35:50 · 7 answers · asked by halfass answers 4 halfass ques. 2 in Mathematics