Science & Mathematics - 2 September 2007

2007-09-02 06:52:26 · 7 answers · asked by Anonymous in Astronomy & Space

The Speed of light in a vacuum is 186,000 miles/second. How many meter/hour is this equivalent to? This is a chemistry problem that I have...I have many more...so if you can explain to me better than my professor can...please, please, get back to me.

2007-09-02 06:51:16 · 6 answers · asked by Anonymous in Chemistry

I currently have trigonometry and I need some help so if you answer this question please let it relate to trig. NOT GEOMETRY (many ppl get confused)

How do you find the complement and supplement of an angle?

EX: find(if possible) the complement and supplement of the angle

π /3

&& also how do convert an angle measure to D° M' S" ( && if you can tell me what d,m,s is also that would be lovely!)

EX: convert the angle measure to D° M' S" form

240.6°

(if you don't know how to work out these problems if you can give me a link that will explain in detail how to solve these problems I would be very grateful!!!)

THANK YOU SO MUCH!!!!!

2007-09-02 06:49:01 · 3 answers · asked by First_time_mommy 2 in Mathematics

can someone please tell me whats 20% off 58.94

thanks

2007-09-02 06:48:12 · 18 answers · asked by Crystal 1 in Mathematics

Kennedy announced we were going to the moon in the 60s and it took 8 years to do it. Bush announced in 2004 that we'd be back to the moon by 2020. Why does it take so long? Russians have announced they will do it by 2025. Do you think we can get back before the Russians?

2007-09-02 06:47:50 · 11 answers · asked by timespiral 4 in Astronomy & Space

When the sun is up and it is daytime, why can you still see the moon sometimes?

2007-09-02 06:47:35 · 7 answers · asked by ir_mabcab 3 in Astronomy & Space

The number 2.525252525252... can be written as a fraction.

What is the sum of the terms of the fraction?

2007-09-02 06:41:16 · 5 answers · asked by Christine P 5 in Mathematics

wes there one just right now?

2007-09-02 06:40:08 · 11 answers · asked by Alexin 4 in Earth Sciences & Geology

it was today like about 8 minutes ago in southern california...did anyone feel it?

2007-09-02 06:39:14 · 6 answers · asked by BeProud 3 in Earth Sciences & Geology

I though that maybe alien spaceships use a radio freqency to hover in air. to me this same posable, but don't know

2007-09-02 06:35:37 · 5 answers · asked by nicdongui 2 in Astronomy & Space

I have some questions plz tell answers and steps and stuff on how you find out.

4. Find the parametric equations for an ellispse of the form x^2/a^2 +y^2/b^2 = 1.
Tks for help

2007-09-02 06:34:33 · 3 answers · asked by CGAR 2 in Mathematics

I already know I can divide, but I have to use substitution. Do I just plug in the x-2 for x? Please HELPPP!!

2007-09-02 06:32:45 · 6 answers · asked by Anonymous in Mathematics

2007-09-02 06:31:43 · 5 answers · asked by Anonymous in Mathematics

A L of water at 25 C dissolves 0.0404 g O2 when the partial pressure of O2 is 1.00 atm. Whar is the solubility of O2 from air, in which the partial pressure of O2 is 159 mmHg?

All calculations aside, I got it right: 8.5x10^-3 g O2/L
BUT my book says that the answer is 8.45x10^-3 g O2/L

I don't have any review in this book about significant figures but from what I've found on the internet, when you multiply or divide, you use the smallest number in the problem to determine the nimber of significant figures. So when the smallest number is 25, is the answer 8.5..... or 8.45......?

2007-09-02 06:30:44 · 4 answers · asked by ecodiva 2 in Chemistry

2007-09-02 06:27:02 · 3 answers · asked by Anonymous in Physics

1. 1/(x+h) - 1/x

2. 2/(x^2)/10/(x^5)

3. (1/3+x - 1/3)/x

4. square root of x/x

5. e^(1+ln(x))

2007-09-02 06:25:56 · 1 answers · asked by jehu22293 2 in Mathematics

keeping it as a mixed number

2007-09-02 06:19:40 · 10 answers · asked by Papi Tony 3 in Mathematics

1. Retroviruses are unusual because:
a. The virion contains DNA and replication occurs via an RNA intermediate
b. The virion contains RNA and replication occurs via a DNA intermediate
c. The virion contains both DNA and RNA
d. None of these are true

2. For which of the following DNA viruses does replication of DNA occur in the cytoplasm?
a. Parvoviruses
b. Papovaviruses
c.Herpesviruses
d. Poxviruses

3. Viroids are unusual because they:
a. Consist of naked DNA
b. Consist of RNA and protein
c. Contain no nucleic acid
d. Contain neither nucleic acid or protein
e. None of these

4. Prions are of significance because they cause diseases known as:
a. Chronic Wasting disease
b. Kuru
c. Bovine Spongiform Encephalopathy
d. Influenza
e. all of the above
f. None of the above

5. Prions are unusual infectious agents because they:
a. Consist of naked RNA
b. Consist of protein and RNA
c. Consist of protein with no detectable nucleic acid
d. None of these

2007-09-02 06:16:57 · 7 answers · asked by Anonymous in Biology

Before the birth they have good health but after they lose hair and teeth, and have constant health problems, and are never the same. It seems as if they were made by nature to last one birth, and then it does not matter if they survive or not. Should not they have been made more resilient as survival of species? It would not do to produce numerous female species to use only once evolutionarily, so why are they like this?

2007-09-02 06:13:52 · 7 answers · asked by 17 3 in Biology

"At first, all the lockers are closed. A person walks by, and opens every other locker, starting from locker 2. Thus lockers 2, 4, 6, ... 998, 1000 are open. Another person walks by, and changes the "state" (open or closed) of every third locker. Another person changes the state of every fourth locker, and so on."

I have figured out the answer to this question - lockers whose numbers are perfect squares will be closed (1, 4, 9, 16, 25, and so on). It's simple once you think about it; the number of factors a number has is how many times its "state" has been changed. If we look at 6, it can be broken into 1 x 6 and 2 x 3. Disregarding 1 (because nobody went around changing all the closed lockers to open), the state has been changed 3 times leaving it open. Now take 25. Breaking it apart into its factors, we get 1 * 25 and 5 * 5. We can't include 5 twice, so there are an even number of state changes leaving it closed.

So I understand this problem, but how can I prove it?

2007-09-02 06:12:50 · 2 answers · asked by Anonymous in Mathematics

2007-09-02 06:11:46 · 7 answers · asked by raaas 1 in Other - Science

Cinnamic acid contains only carbon, hydrogen and oxygen, and is found by analysis to be 73% carbon and 5.4% hydrogen. In a titration, 18.02 ml of .135M NaOH is found to neutralize .3602 grams of cinnamic acid

Find the emprirical formula of Cinnamic acid
Find the molar mass of Cinnamic acid
Write the molecular formula of Cinnamic acid

2007-09-02 06:11:12 · 5 answers · asked by dylson20 1 in Chemistry

2007-09-02 06:10:15 · 5 answers · asked by jinnyboy22 1 in Engineering

Vector A is 3 units in length and lies along the positive x-axis. Vector B is 6 units in length and points along a direction 120 degrees from the positive x-axis. What’s the direction of the resultant with respect to x-axis ? (cos 60 =0.5 and sine 60=0.87)

2007-09-02 06:08:22 · 2 answers · asked by Anonymous in Physics

2007-09-02 06:06:49 · 6 answers · asked by raaas 1 in Physics

2007-09-02 06:06:47 · 10 answers · asked by jd e 1 in Mathematics

4 2/7 x 8/11

2007-09-02 06:04:50 · 4 answers · asked by Anonymous in Mathematics

Meteors hits the earth all the time. What happens if one hits the space station.

2007-09-02 06:04:30 · 10 answers · asked by USAman 6 in Astronomy & Space

Please provide the details of the maker.

2007-09-02 06:03:59 · 6 answers · asked by raaas 1 in Geography

F(x)= (sin2x) / x , x cannot equal zero

k, x=0

In order for f(x) to be continuous at x=0, what must the value of k be?

2007-09-02 06:03:54 · 5 answers · asked by Mike 2 in Mathematics