Science & Mathematics - 13 November 2007

So far I have- reduce use, re-use, recycle,plant trees if you could be of some help I would greatly appreciate it. Thanks

2007-11-13 12:38:05 · 3 answers · asked by CW 1 in Earth Sciences & Geology

I want a career as working in a hobby shop and building RC gas cars do i take mechanical engineering in college?

2007-11-13 12:36:10 · 2 answers · asked by kenny c 2 in Engineering

2007-11-13 12:35:51 · 6 answers · asked by Anonymous in Mathematics

2007-11-13 12:33:36 · 3 answers · asked by alison k 1 in Zoology

A tree killed by being buried under volcanic ash was found to have a ratio of carbon-14 atoms to carbon-12 atoms of 4.8x10^-14. How long ago did the eruption occur?

(The answer is 2.7x10^4, although I'm not sure how they got that answer... could anyone explain what I have to do?)

2007-11-13 12:33:19 · 1 answers · asked by Anonymous in Chemistry

please help me
tell me if they are only found in plant cells or only in animal cells or in both:
pseudopod
plasma membrane
cilium
centrioles
thank you

2007-11-13 12:30:52 · 1 answers · asked by Sara b. 2 in Botany

How does the farm bill affect people who are not farmers? my friend suggested something about corn??

2007-11-13 12:27:43 · 7 answers · asked by stargirl2000s 2 in Agriculture

I'm working on a lab report and one of the follow-up questions is:

The highest possible oxidation state for the halogens is +7, and the lowest possible is -1. Which of the following could not disproportionate?

BrO⁻ Cl₂ Br⁻ HClO₄ IO⁻

Can someone please help me figure this out? thanks a lot!

2007-11-13 12:23:18 · 2 answers · asked by lostnconfused 2 in Chemistry

N2(g)+O2(g)+heat<-->2NO(g)
why does nitric oxide(NO) not genereally form in the atmosphere but is formed in the internal combustion engine of an automobile or during a lightning storm.

2007-11-13 12:20:58 · 2 answers · asked by m 1 in Chemistry

A linearly polarized electromagnetic wave is sent through two sheets of polarizing material. The first sheet,A, is oriented so that its transmission axis makes an angle of 30deg with respect to the incident electric field of the wave. The second sheet,B, is oriented so that its transmission axis makes an angle of 90deg with the incident electric field of the wave. The incident beam has an electric field of peak magnitude Esubscript0 and average intensity Ssubscript0.

a) What is the peak value of the electric field amplitude after it goes through sheet A?

b) What is the average intensity of the wave after it passes through A?

c) What is the average intensity of the wave after it passes through B?

d) Suppose that A and B are interchanged so that the wave is first incident upon B. What is the average wave intensity after passing through both polarizing sheets?

2007-11-13 12:18:51 · 1 answers · asked by Steph C 1 in Physics

2007-11-13 12:09:59 · 1 answers · asked by baddab369 1 in Chemistry

It takes a 615-kg race car 14.3 s to travel at a uniform speed around a circular racetrack of 50.0 m radius .

What is the acceleration of the car?

What average force must the track exert on the tires to produce this acceration?

2007-11-13 12:09:38 · 2 answers · asked by james 2 in Physics

If a satellite in circular orbit is observed to have a speed of 5620 m/s at a eight of 8.73 x 10^6 m above the surface of a planet of radius 1.02 x 10^7 m, what is the mass of the planet?

2007-11-13 12:08:48 · 6 answers · asked by Anonymous in Physics

Mass percent?
Mass percent is grams of solute over liters of solution (hydrogen peroxide) i have 8.72g of h2o2

I know i have .46 moles in .00872 liters and the density is 1.00g/ml

what is the %m/m?

2007-11-13 12:08:37 · 2 answers · asked by mikala m 2 in Chemistry

2007-11-13 12:08:14 · 3 answers · asked by Dani 1 in Chemistry

... how to solve it using the law of cosines! Can someone please help me please????

It says:

A boat heads 35 degrees (does not say from where), propelled by a force of 750 lbs. A wind FROM 320 degrees exerts a force of 150 lbs on the boar. How large is the resultant force, and in which direction is the boat moving?

I have no idea how to set this up or anything!!! Can someone please walk me through this?! I would appreciate it so much! Thank you so much and I will pick a best answer TODAY!!!!!!!!!!!!


Also, can anyone tell me what type of math class you would find this in (i.e. precalc, calc 1, calc 2, linear algebra, etc.)?

2007-11-13 12:08:09 · 3 answers · asked by James J 2 in Mathematics

An explosion is made when lycopodium powder (can be substituted with dry flour) is blown into a flame. Fire (energy) is created.

Are there any other products with this reaction?

(THANKS! =D)

2007-11-13 12:07:50 · 1 answers · asked by Anonymous in Chemistry

The blovk weighs 1.22 x 10*4 N. Assuming there is no friction what is the maximum angle that the slope can make with the horizontal if the machine is to able to complete the task?

2007-11-13 12:07:28 · 1 answers · asked by life 2 in Physics

2007-11-13 12:06:31 · 6 answers · asked by Sandra 2 in Paranormal Phenomena

2007-11-13 12:00:46 · 1 answers · asked by Hi y'all 1 in Chemistry

some advantages and disadvantage of both please.

thank you

2007-11-13 12:00:03 · 1 answers · asked by element69ca 1 in Engineering

2007-11-13 11:57:42 · 2 answers · asked by aq123 3 in Zoology

its for my science homework

2007-11-13 11:56:48 · 8 answers · asked by ♥ Tia Alexandria ♥ 3 in Chemistry

How do u find out critical points when graphing a graph. I know how to find out the vertex and zeros/roots. I need help find out critical points so the graph can be more exact. Please Help me.

Critical points are those points on a graph at which a line dran tangent to the curve is horizontal or vertical. Please help me!

The equation is -h^2+18h
i got the vertex which is (9,81)
81 being the maximum
the zeros/roots i got are 18 and O
help me find out the critical points

everything is right so far.......my answers are not wrong trust me. i just need help finding critical points so my graph can be more accurate.

2007-11-13 11:54:45 · 3 answers · asked by Ballerina 5 in Mathematics

For about a month now, there has been a little spider above my bed, in my room. Me and my friend didn't bother to kill it, or put it out side either. We decited to just leave it alone, and then we named it Milton lol! It has been feeding of lady bugs that crawl in my room, and sometimes moths, when I forget to close my window.

It's back & about the size of a lady bug(or overall the size of my nail). It's a brown color with black spotish-line things on it's back. It's legs are brown with black stripes. It looks pretty tiny and harmless. Does anybody know what type of spider this could be? I would like to know if it is posiones 'er not. Thanx!

2007-11-13 11:54:27 · 6 answers · asked by Bree 2 in Zoology

2007-11-13 11:52:14 · 2 answers · asked by Duong P 1 in Earth Sciences & Geology

Can you still use the equation m=nM?
Lets say you have 0.00000245mol of potassium-40. Are you allowed to assume that M=40g/mol and then multiply it by the moles in order to calculate mass?

Is it even possible to calculate the mass of an isotope, or am I losing my mind? (Nuclear chemistry is making me go crazy, seriously).

2007-11-13 11:50:26 · 2 answers · asked by Anonymous in Chemistry

i dont have any square footage but just in general (range)

2007-11-13 11:49:51 · 1 answers · asked by Anonymous in Engineering

2007-11-13 11:47:33 · 2 answers · asked by nash 1 in Chemistry

Asked this earlier but made a mistake on the first one...

a. 8x - 3 (x + 2) = 5y - x
b. -6x = 7 -5y

1. How would I rewrite the first equation in slope-intercept form?

2. How would I rewrite the second equation in slope-intercept form?

3. Are they parallel?

10 points to whoever gets it right.

2007-11-13 11:47:16 · 1 answers · asked by Anonymous in Mathematics