Science & Mathematics - 21 August 2007

1. The position of a ball thrown up from the top of a building 150 ft tall with an initial velocity of 20 ft/sec is given by the function s(t) = 16t² + 20t + 150. What is the maximum height of the ball?

2007-08-21 22:04:44 · 2 answers · asked by Lucy A 1 in Mathematics

i know the answer is .707 but getting my calcilator to say it is another thing can you help ?

2007-08-21 21:56:26 · 5 answers · asked by y y 1 in Mathematics

2007-08-21 21:52:03 · 14 answers · asked by Smumph45 6 in Biology

8 boxes of the same size and weight and another one with same size but less weight
9 boxes where mixed & you have a balance equipment with two plates
by using it only two times detect the box of less weight

2007-08-21 21:48:33 · 9 answers · asked by ^-^ engineering student ! ^-^ 4 in Mathematics

Looking for an optical element that performs the same function as polarized film, except either direction of polarization is electrically controlled, or its polarization can be turned on and off (then I could just use two of them to get the same effect). I thought I heard of something like that - similar to an lcd in concept.

2007-08-21 21:45:50 · 2 answers · asked by - 3 in Physics

Are the worlds Governments really hiding evidence of extra terrestrial visits?

2007-08-21 21:42:51 · 15 answers · asked by Anonymous in Astronomy & Space

What method is used to work out this question? (please dont give me the answer, just the best way to work it out!);

a guy is an air-traffic contoller who controls the airspace between Cairns and Coolangatta.
Part of his job is to give instructions to pilots as to the path along which they fly.
He has control of a plane flying an altitude of 30 000 feet.
He orders the plane to descend by 3 000 feet at an angle of 30 degrees.

How far (in feet) has the plane travelled from the start of its descent to the time it has descended 3 000 feet?
Draw a diagram to help you.

Okkkk i have no idea how to work this out but like i said before pleeeeeaaaaase dont give me the answer! I only need to know the method of how to work this out.

Thanks guys!

2007-08-21 21:36:42 · 4 answers · asked by Anonymous in Mathematics

If z1 = 1 - 5i and z2 = 3 + 4i

z1 / lz2l

i.e. What is z1 divided by (the absolute value of z2)??

2007-08-21 21:35:42 · 2 answers · asked by jeska102 1 in Mathematics

2007-08-21 21:23:36 · 3 answers · asked by prettypearl2005 1 in Other - Science

is it???

2007-08-21 21:14:06 · 2 answers · asked by Anonymous in Zoology

and speed

2007-08-21 21:13:38 · 6 answers · asked by Anonymous in Mathematics

If a curve has the gradient, g'(x) = k / (x^2) - [square-root of (x)]

where k is a constant and a stationary point at (4 , -2), then the value of k is?

I think u have to integrate it or something.

The answers is 32? but can someone show me how they get 32 in a fully worked step-by-step solution.

2007-08-21 21:02:14 · 3 answers · asked by Anonymous in Mathematics

Leon's new tank will collect water off the roof of his house which is 160m2. He intends to use the water for watering the garden and washing his car. Leon estimates that he will use approximately 80L of water per day. If the average rainfall in June is 70mm, how full will the tank become by the end of June if it is empty in the start?

- 1mm rain per m2 = 1L water



Note: Please show working out.

Thank-you so much.

2007-08-21 20:48:15 · 3 answers · asked by Inhaler 4 in Mathematics

Hi.

I have 2 acylic latex emulsion with different Tg (glass transition temperature) which is 11oC and 30 oC. Is anyone knows which one will dry faster after applied on paper?

Thanks.

2007-08-21 20:46:46 · 1 answers · asked by stevenfoong 1 in Chemistry

2007-08-21 20:44:46 · 8 answers · asked by angel a 1 in Astronomy & Space

i always hear in the news that the winds' speed is -- Km/H, how do they measure it?

2007-08-21 20:42:32 · 3 answers · asked by Sanad 1 in Weather

Is it possible to fry bacon, an egg, or meat product on a human's back, if exposed to sunlight long enough.

We would like to know that if said product was left upon a person's back for long enough, if the sun would produce enough heat to cook said product enough to make it edible, not considering sanitation issues.

2007-08-21 20:35:59 · 12 answers · asked by runningtoouden 1 in Other - Science

say me theoritically???????????

2007-08-21 20:34:57 · 26 answers · asked by Anonymous in Astronomy & Space

-20/w+4=-12/w

thats divide

2007-08-21 20:33:44 · 3 answers · asked by regine f 1 in Mathematics

drilled all the way through the Earth, then got inside an indestructible pod and fell into the hole?

2007-08-21 20:30:05 · 10 answers · asked by jdzmumbles 3 in Physics

2007-08-21 20:23:25 · 5 answers · asked by Diamonds 1 in Other - Science

what is the mechanism of the reaction?

2007-08-21 20:16:15 · 2 answers · asked by Anonymous in Chemistry

im about to design an electronic medical record that can be used in different medical specialties. is there some medical form that i can refer to? i plan to implement it in a clinical setting

2007-08-21 20:10:05 · 3 answers · asked by andy 2 in Medicine

i only heard about it

2007-08-21 20:07:20 · 11 answers · asked by cathy glenn 1 in Astronomy & Space

i only heard about it

2007-08-21 20:05:47 · 10 answers · asked by cathy glenn 1 in Astronomy & Space

basically testing right?

2007-08-21 19:59:39 · 1 answers · asked by HoHoHo 1 in Engineering

2007-08-21 19:47:05 · 3 answers · asked by l.a. 1 in Medicine

2007-08-21 19:35:12 · 7 answers · asked by Anonymous in Astronomy & Space

WHAT is the difference between the 2(and y should anyone care)...I mean seriously brass tacks....they are both singularitites and they both will compress and spin you to the point where you come apart at the subatomic level anyway right?..if not help me to understand...and dont be patronizing...I am human just like you and have decent intelligence like you...so put it out there on the table.

2007-08-21 19:27:35 · 6 answers · asked by dabliss74 1 in Astronomy & Space

1. log_5 x+3=log_5 (x-20)+4

2. log_2 x+5=8-log_2 (x+7)

3. log_x 9=-2

2007-08-21 19:20:06 · 2 answers · asked by Gael C 1 in Mathematics