Science & Mathematics - 4 October 2007

2007-10-04 12:34:40 · 3 answers · asked by Josh D 1 in Mathematics

2007-10-04 12:33:55 · 2 answers · asked by lizardeye321 2 in Engineering

The helicopter in the drawing is moving horizontally to the right at a constant velocity. The weight of the helicopter is W = 54600 N. The lift force generated by the rotating blade makes an angle of 21.0° with respect to the vertical.


(a) What is the magnitude of the lift force?


(b) Determine the magnitude of the air resistance that opposes the motion.

2007-10-04 12:33:04 · 1 answers · asked by J.Mo 1 in Physics

i completely forgot the rules when you multiply, subtract, divide and add things with exponents!

okay, when you multiply, say

1.29 x 10^3 x 3 x 10^17

would it be 3.87 x 10^20, or 1.47 x 10^21? i add the exponents right?

and another one:

3 x 10^17
------------- (divided by)
5.4 x 10^5

you subtract right? so...5.5 x 10^11??

thanks a lot!

2007-10-04 12:32:56 · 4 answers · asked by Anonymous in Mathematics

2007-10-04 12:32:31 · 1 answers · asked by PANFILIA M 1 in Chemistry

this is the 3rd time im asking T_T , i dont think i made the last one clear enough. so there's 2 circuits, parallel and series each with 4 bulbs (the 2 batteries are not in parallel in the parallel circuit, in both circuits the batteries are side-by-side). in the series circuit, the bulbs are lines up. in the parallel, the bulbs are in parallel, each with their own path. if it is series, is it because when energy goes through the filament (the resistor in this case) it's converted into light and heat, but when it goes past the resistor, the energy is transferred back into it's original power? what if it doesnt? does the first bulb closest to the positive ( i think energy goes positive to negative terminal) terminal appear brighter than the rest? and the fourth bulb the dimmest? what about parallel. lets say the total voltage is 12V. does each bubl get 3V ea then? please explain.

2007-10-04 12:29:18 · 7 answers · asked by Anonymous in Engineering

6s+9s=18
solve for s

PLEASE HELP!!
i seriously dont know how to do this
and likee i cant ask my math teacher
and my mom doesnt have a clue

2007-10-04 12:29:08 · 5 answers · asked by Anonymous in Mathematics

2007-10-04 12:28:19 · 11 answers · asked by Anonymous in Physics

2007-10-04 12:27:17 · 3 answers · asked by Rob D 1 in Mathematics

2007-10-04 12:26:55 · 4 answers · asked by shawn l 1 in Astronomy & Space

how many outlet pipes of diameter 1.5 cm are needed to carry the same amount of water as one pipe having a diameter of 3 cm?

2007-10-04 12:26:01 · 6 answers · asked by Anonymous in Mathematics

i do not undestand this problem at all my mom & dad have tried it but they dont understand it. please help && i'll love you forever lol


http://tinypic.com/view.php?pic=15gyxsk&s=2

2007-10-04 12:25:41 · 2 answers · asked by Nettie S 1 in Chemistry

I know it's 80% for a plant cell but I was wondering what the maximum percentage was for humans.

2007-10-04 12:24:33 · 1 answers · asked by Brooke 2 in Biology

2007-10-04 12:22:12 · 5 answers · asked by AKR 2 in Geography

It should read....

2m 4 squared x 8m 8 squared.

I NEED SOME HELP WITH THIS ONE. I'M NOT UNDERSTANDING HOW TO WORK IT OUT.

2007-10-04 12:21:18 · 2 answers · asked by Anonymous in Mathematics

2007-10-04 12:20:57 · 3 answers · asked by Anonymous in Mathematics

How many grams of phosphorus react with 39.4 L of O2 at STP to form tetraphosphorus decaoxide?
P4(s) + 5 O2(g) P4O10(s)

2007-10-04 12:20:50 · 1 answers · asked by cj 2 in Chemistry

I am just missing something..I dont understand how to get these...I dont want the answer, I want to know how to set it up and why.


Mouthwash is 21.6% alcohol by volume. Each pint contains .358 of a pint of alcohol. density of alcohol is .876g/ml. how many kilograms of alcohol are in one bottle?

2007-10-04 12:20:29 · 1 answers · asked by mikala m 2 in Chemistry

Marine Engineering

2007-10-04 12:20:10 · 4 answers · asked by a Student 1 in Engineering

8x^2 + 4x = 5

2007-10-04 12:20:05 · 1 answers · asked by Anonymous in Mathematics

please, can you tell me what's the value of x?
if you can, explain. and yes, i'll choose a best answer.............
thank you.

2007-10-04 12:18:53 · 6 answers · asked by anonymous 5 in Mathematics

2007-10-04 12:18:24 · 6 answers · asked by shawn l 1 in Astronomy & Space

2007-10-04 12:17:22 · 1 answers · asked by david w 1 in Mathematics

Today in Chemistry we were doing a lab. We used Barium nitrate, Barium chloride, Lithium chloride, Copper (II) chloride, Strontium nitrate, Strontium chloride, Calcium nitrate and Potassium nitrate. As I was crushing up one of those (I can't remember which one, but I know it was clearish/whitish), a few grains shot up into my mouth. I immediately rinsed my mouth out and then told the teacher, but he didn't take me very seriously since I couldn't remember which salt I was working with. He made me feel almost like I'd done something wrong for not paying attention to detail. Well excuse me, it could have happened to anyone.

But anyways, my question is, am I okay? Do you think this is anything to worry about? Enough to harm me and/or kill me?..

2007-10-04 12:16:09 · 12 answers · asked by isabelle.the.insomniac 2 in Chemistry

2007-10-04 12:15:45 · 4 answers · asked by jasonz619 1 in Chemistry

Does paper age physically when it is laminated? Does it brown or get brittle?

I don't really need to know the answers, I'm just curious.

2007-10-04 12:15:43 · 1 answers · asked by Anonymous in Chemistry

2007-10-04 12:15:13 · 6 answers · asked by Sara R 1 in Mathematics

this is the second time im asking, i dont think i made the last one clear enough. so there's 2 circuits, parallel and series each with 4 bulbs (the 2 batteries are not in parallel in the parallel circuit, in both circuits the batteries are side-by-side). in the series circuit, the bulbs are lines up. in the parallel, the bulbs are in parallel, each with their own path. if it is series, is it because when energy goes through the filament (the resistor in this case) it's converted into light and heat, but when it goes past the resistor, the energy is transferred back into it's original power? what if it doesnt? does the first bulb closest to the positive ( i think energy goes positive to negative terminal) terminal appear brighter than the rest? and the fourth bulb the dimmest? what about parallel. lets say the total voltage is 12V. does each bubl get 3V ea then? please explain.

2007-10-04 12:13:25 · 4 answers · asked by Anonymous in Physics

im confused. what will the graph x=5 look like and what will the slope be?

2007-10-04 12:11:33 · 4 answers · asked by Fran Y 1 in Mathematics

It said that by 2030, the processors we now have in our computers will be so out of date, that they will be worth maybe 25 ¢.

2007-10-04 12:11:32 · 7 answers · asked by ~JennyBunny~ 7 in Engineering