Science & Mathematics - 28 September 2007

2007-09-28 13:23:37 · 18 answers · asked by Jordyyyn ;] 1 in Astronomy & Space

how fast im mph would i go if I am 140lbs and fell for 4 seconds in a vacuum?

2007-09-28 13:21:14 · 2 answers · asked by dave d 2 in Physics

2007-09-28 13:19:06 · 6 answers · asked by Boogie 2 in Mathematics

when superheated steam (ex.102 bar temp, 510 centgrade,) pressure reduced to 13 bar , water spray is applied for reduce it temprature, why it is required ? pl, Explain me.

2007-09-28 13:18:39 · 3 answers · asked by amshaikh748 1 in Engineering

A person is chosen at random from a large population containing 50% males and 50% females.

A – event that the person is male
B – event that the person is female

Are A and B independent events? Justify your answer.
Do you find this answer rather unintuitive? Explain.

2007-09-28 13:15:03 · 5 answers · asked by Dr D 7 in Mathematics

please help me to do this question ;) thanks

2007-09-28 13:13:44 · 2 answers · asked by Nikita 1 in Physics

2007-09-28 13:09:00 · 6 answers · asked by amshaikh748 1 in Chemistry

Amber drove to Connor's house at 43 mph. Connor's house is twenty-six miles away. How long did it take her to arrive at Connor's house?

2007-09-28 13:08:19 · 8 answers · asked by Anonymous in Mathematics

What is a newt? I want to recreate a Harry Potter experiment and need a newts eye.

2007-09-28 13:06:40 · 9 answers · asked by Seed Plower 5 in Botany

2007-09-28 13:02:42 · 2 answers · asked by pallet_pop 1 in Botany

Copper powder lab?!?
We heated purified copper powder in a crucible over a hot plate (while continuosly stirring) the result, the powder turned black.

What can be the purpose of this experiment? Is this correct: To determine whether there is a chemical reaction when Copper powder is heated?

2007-09-28 13:02:12 · 1 answers · asked by double_drago 3 in Other - Science

explain why a molar volume of a gas ar R.T.P. is greater than thast of the gas at S.T.P.

Ｏ2→Ｏ3 {AT HIGH VOLTAGE ACROSS THE GAS}
WOULD THE MASS OF THE GAS BE CHANGED AFTER THE CONSERVATION ? EXPLAIN YOUR ANSWER.
PS: O2 IS oxygen , O3 is ozone

2007-09-28 13:00:10 · 1 answers · asked by smooth lens 1 in Chemistry

2007-09-28 12:56:18 · 3 answers · asked by btfilms77 2 in Zoology

why is it 25 hours and NOT 24 hours??

2007-09-28 12:41:18 · 3 answers · asked by toriw94 1 in Astronomy & Space

If the width of a rectangle is 4 1/3 m and the perimeter is 9 7/15 m, what is the length of the base of the rectangle?

2007-09-28 12:35:26 · 9 answers · asked by Anonymous in Mathematics

•Who can do splits the farthest down?
•Doesn’t matter what age or gender.
•I will measure the length of the legs and measure how long the split is (like a ratio).
•The independent variable will be the sport that they play (like basketball, karate, dancing, gymnastics, baseball, football).

2007-09-28 12:29:01 · 5 answers · asked by Lillian G 2 in Other - Science

(x-749)-(260*676)=(230-507)*(543+3243)
Can you solve this equation, it may be impossible for some, but I know someone out there can do it.

2007-09-28 12:26:53 · 4 answers · asked by Starry_Butterfly 2 in Mathematics

Is e=Mc squared calculas?

2007-09-28 12:25:18 · 13 answers · asked by ♣Social Butterflygirl 4 in Mathematics

and can you/have you taken both at the same time?
what could/will happen?

2007-09-28 12:21:27 · 0 answers · asked by cass 1 in Medicine

i dont want any text book anwer to this , if your going to dont bother. i want to think out of the square a bit. so could they be the some thing just different size models. like one thing people say they cant be is ones governed by electro magnetic energy and the other by gravity but too do the comparison proply you have to speed up the planets and if you spead them up say too a trillion times or how much it had to be wouldnt gravity look alot like electro magnitic energy? what i really want to know about is that speed conversion cuz i dont think people take that into account when they think about the comparison. or do they?

2007-09-28 12:15:15 · 6 answers · asked by Anonymous in Physics

see i was always told that oxygen was flammable. and if you were in a 100% oxygen environment and lit a match it would all go kaboom. but now i hear that its not flammable. so i guess my question is:

if i were to somehow fill a vacuum sealed room with all oxygen, and lit a match what would happen.

2007-09-28 12:09:02 · 9 answers · asked by Anonymous in Chemistry

Since lead is more dense than water, and the density of a substance will always be the same no matter what size, than (1)how come a very small piece of lead can float on water????
(2)Is this only because of surface tension? Or is there more?

(3) Is density the only key to whether or not a substance will float in the presence of another, or is the bouyant force totally different than just density?!?!?!?!

2007-09-28 12:05:43 · 4 answers · asked by Upon this rock 3 in Physics

how do you find the derivative of:

1. y=(sin x) ^ x

2. y= x ^ (1-e)

3. y= x ^ - sq root(2)

2007-09-28 12:04:46 · 4 answers · asked by BigE-zy 2 in Mathematics

CH3--CH--CH2--C==CH-CH3
| |
CH3 CH3

the formula came up weird but the two CH3 on the second line are linked to the first CH and the single C

thank you for those who answered my other question of what it was called

2007-09-28 12:01:02 · 3 answers · asked by gotmilky2001 2 in Chemistry

Well, my real question is this...I really love animals and would love to one day work with them at a zoo, wildlife preserve, or basically my desire is to work with exotic animals...I am looking into vet tech schools at the moment but of course I have been getting some negative feedback about the profession...but it seems like a vet tech school would be the first step I could take...I dont know...HELP! Any advice or anything you could share would be great!

2007-09-28 11:58:06 · 4 answers · asked by chemicalxeyes 2 in Zoology

uhhhh what? i'm have no clue how to find these equations...can someone show me step by step so that i will know how to do them later...thanks in advance!!

1. Calculate the acceleration and the tension in the rope. For your variables use "m1", "m2", "theta1", "theta2" and "g". Assume all surfaces are frictionless, and the pulley and rope are massless and frictionless.

Diagram: http://www.webassign.net/userimages/48539?db=v4net

2. Find the acceleration for each of the following machines (use the same notation conventions as the previous problems; i.e. m1, m2, theta1, theta2, g, etc.).

Diagram 1: http://www.webassign.net/userimages/48540?db=v4net

Diagram 2: http://www.webassign.net/userimages/48541?db=v4net

Diagram 3: http://www.webassign.net/userimages/48542?db=v4net

2007-09-28 11:57:51 · 2 answers · asked by crazygirl0630 2 in Physics

this is the first question 90.00 for 75 plates ... there are more and i am trying to help a friend, if you could just tell me what it means, i dont need the answer, i just need to know how to do it. thanks!

2007-09-28 11:57:15 · 4 answers · asked by Dianne L 4 in Mathematics

If someone gets wet on the holodeck, then leaves the room, do they stay wet?

2007-09-28 11:55:17 · 13 answers · asked by Anonymous in Zoology

ahhh i hate physics!..i have never had to come up with equations myself before!!, if someone could show me how to work these problems so i can use it for future ones i would greatly appreciate it

1. Find equations for the acceleration and the tensions in the ropes. For your variables use "m1", "m2", "m3" and "g". Assume all surfaces are frictionless, and the pulley and rope are massless and frictionless. Let the left rope have tension T1 and the right rope have tension T2.

Diagram: http://www.webassign.net/userimages/48537?db=v4net

**I kinda started this one and got a=((m3-m2)*g)/(m1+m2+m3) but webassign said it was wrong!!

2. Calculate the acceleration and the tension in the rope. For your variables use "m1", "m2", "theta" and "g". Assume all surfaces are frictionless, and the pulley and rope are massless and frictionless.

Diagram: http://www.webassign.net/userimages/48538?db=v4net

2007-09-28 11:52:51 · 1 answers · asked by crazygirl0630 2 in Physics

2007-09-28 11:52:00 · 9 answers · asked by Anonymous in Weather