Science & Mathematics - 16 October 2007

A number multiplied by itself and then by itself again gives
-1,000. What is the number?

2007-10-16 18:16:22 · 10 answers · asked by klaudia 1 in Mathematics

how do i solve this?
Find the dimensions of a rectangle whose area is 36 m^2 and whose diagonal is 5 square root of 3 m long.

2007-10-16 18:13:16 · 5 answers · asked by Here for You 2 in Mathematics

I'm more confused on part (a.) on how to answer the question more than anything else, here is the whole thing:

A car initially traveling eastward turns north by traveling in a circular path at uniform speed as in the figure below. The length of the arc ABC is 210 m, and the car completes the turn in 32.0 s.

(a) What is the acceleration when the car is at B located at an angle of 35.0°? Express your answer in terms of the unit vectors and .

(b) Determine the car's average speed.

(c) Determine its average acceleration during the 32.0 s interval.

-------------------------------------

I've tried answering part B without answering part a. which I assumed that the ABC arc was just another type of radius and thus r=210m and that my angle would just become 35 degrees. Then I solved for Velocity with the F= m(v^2/r) got the velocity which due to shortage of characters my answer which was incorrect was 37.96 m/s, so I'm stumped currently.

Appreciate the help. :+)

2007-10-16 18:10:29 · 4 answers · asked by Anonymous in Physics

i need to find f(x+h)
with the following:
f(x)=6x+2

it is to my understanding that I need to replace the X in the original function with the function of x they are providing me with, thus:

f(x)=6x+2
f(x+h)= 6x+2+h

but the answer in the book is: 6x+6h+2...
and i can't understand why....

2007-10-16 18:08:37 · 8 answers · asked by Asile 4 in Mathematics

2007-10-16 18:07:32 · 4 answers · asked by Ozzie 1 in Chemistry

Given: If a triangle has two congruent sides, then the angles opposite those sides are congruent.

What can you assume if, in triangle DEF, the measure of angle D is not equal to the measure of angle F?

2007-10-16 18:07:10 · 5 answers · asked by Anita 5 in Mathematics

2007-10-16 18:05:55 · 4 answers · asked by Ozzie 1 in Biology

What would happen if a person fell from a building and, on the way down, grabbed a high-voltage wire? If the wire supports him as he hangs, will he be electrocuted?

Finally, if the wire breaks, should he continue to hold onto the end of the wire as he falls?

Thanks

2007-10-16 18:04:39 · 11 answers · asked by Anonymous in Physics

In this problem...What is the force of gravity between you and the earth...what would be the value of "r" in the equation for Newton's law of universal gravitation...i thought it would be zero since we are on the earth but zero can't be in the denominator so i'm stumped...can anyone help me out?

2007-10-16 18:04:06 · 4 answers · asked by k_hrdr 2 in Physics

This is true. I was in a very remote, dark area. We were stargazing and the Milky Way stretched across the sky. All of a sudden, out of nowhere, I saw a pinpoint of light grow many times in magnitude and then snuff out. My question is: Is it possible it was a supernova, or should I be looking closer to home; i.e. a satellite that exploded. How can I check ? How can I report it ? It happened around 7:55pm PST.

2007-10-16 18:02:50 · 9 answers · asked by Dan H 2 in Astronomy & Space

i need help factoring.

2007-10-16 18:02:18 · 8 answers · asked by Desiree S 1 in Mathematics

For example, is HSO4- (hydrogen sulfate) an acid? Is OH- (hydroxide) an acid?

2007-10-16 17:57:35 · 2 answers · asked by Shushan A 2 in Chemistry

If a rock is thrown upward with an initial velocity of 32 feet per second from the top of a 40-foot building what is the height in equation form

2007-10-16 17:57:08 · 4 answers · asked by Anonymous in Mathematics

I've always wanted to know if trapped at sea or on a desert island, whether or not this method would work to create drinking water.

2007-10-16 17:48:50 · 3 answers · asked by Maou 1 in Earth Sciences & Geology

Pi.... it means 3.14...etc

It is very obvious that many people think it is irrational.

BUT, the definition of a rational number is that it can be put it in an A over B form.... or a fraction

Pi = 7 over 22 = 7 divided by 22 = 7/22 ....etc

So... rational or irrational... ill ask my Math teacher

2007-10-16 17:48:11 · 9 answers · asked by Anonymous in Mathematics

2007-10-16 17:47:46 · 4 answers · asked by Deenie 6 in Paranormal Phenomena

help pleaseeee, eexplain

2007-10-16 17:45:48 · 6 answers · asked by gaas 1 in Chemistry

Suppose there is a planet that is tidally bound to its star, much like our moon is locked to the earth. If the conditions were right for the average temporature of the planet to sustain liquid water, then would all the acumilation of ice on the dark side cause the planet to change its rotation?

2007-10-16 17:44:52 · 2 answers · asked by bricolage 1 in Physics

Terephthalic acid is an important chemical used in the manufacture of polyesters and plasticizers. It contains only C, H, and O. Combustion of 19.81 mg terephthalic acid produces 41.98 mg CO2 and 6.45 mg H2O. If 0.242 mol of terephthalic acid has a mass of 40.2 g, determine the molecular formula for terphthalic acid.


SoI tried to figure out if 19.81mg = 41.98 mg CO2 and = 6.45 mg H2O then it's 2.119131752 times the acid for CO2 and 0.3255931348 times for H2O then 1 mol = 166.1157025g
then CO2 = 30% C and 70% O
and H2O = 11% H and 88% O
Then it's C9H6O18
But that's not correct can you help me?
What is the answer? and can you explain how you got it please.

2007-10-16 17:41:25 · 1 answers · asked by Anonymous in Chemistry

i know that andesite is a type of magma.. but my science bok isnt helping...

2007-10-16 17:41:24 · 1 answers · asked by darleenie_144 1 in Earth Sciences & Geology

thanks for answering

2007-10-16 17:38:12 · 1 answers · asked by Anonymous in Chemistry

Nitinol (memory) wire usually comes in lenghts. I need one made into a circular loop in order to make a heat engine

2007-10-16 17:37:38 · 4 answers · asked by Anonymous in Engineering

Use Differentiation to solve the problem

1. A man starts walking north at 4ft/s from a point P. Five mins later a woman starts walking south at 5ft/s from a point 500 ft due east of P. At what rate are the people moving apart 15 min after the woman starts walking?

2007-10-16 17:37:20 · 1 answers · asked by bdx 1 in Mathematics

Uranus is supposed to be in the constellation Aquarius this year, but I dunno when that comes up. Also..where to look would be nice too. Northern Hemisphere.

2007-10-16 17:36:59 · 3 answers · asked by Snaps 2 in Astronomy & Space

If 0
Is that true or false? and most importantly whats the reason? explanation?

2007-10-16 17:35:21 · 2 answers · asked by Anonymous in Mathematics

sheets tied together can support a mass of only 58 kg. How might the thief use this "rope" to escape? Give a quantitative answer.

2007-10-16 17:33:27 · 3 answers · asked by Hu-Li X 1 in Physics

Do they come out and lay on the pavement the same way as earthworms? I want to go jogging, but I don't know if it's safe since its raining, and there's rattlesnakes around the trails.

2007-10-16 17:32:32 · 4 answers · asked by tigergeek16 2 in Zoology

i know it will shatter but why???

2007-10-16 17:28:38 · 4 answers · asked by gaas 1 in Chemistry

2007-10-16 17:24:07 · 2 answers · asked by Lole E 1 in Mathematics

The project is about hydropower. I made this dam type thing and I have a water pump like device( the ones they use in aquariums to filter the water). Anyways the water pump pumps the water over the dam. I also made a turbine out of 2 margarine container caps( they are circular and are made out of bendy plastic) and I attached some soda bottle caps to the middle of the caps.... I know this is kinda confusing....umm it looks like a water wheel. This water wheel is the turbine for the dam. I attached the water wheel to the dam by means of a copper wire and I had to make a hole in the margarine caps in order to pass the wire through. I also bought a 9 volt DC motor and I attached it to a light bulb. The DC Motor has like a spoke thing and whenever the spoke turns electricity is produced. I need to know how to attach the DC MOTOR to the water wheel so whenever the wheel turns it turns the spoke and produces electricity. If anyone could help me I would be reaally grateful to them. Thanks.

2007-10-16 17:23:41 · 4 answers · asked by Amitha 2 in Engineering