Science & Mathematics - 11 September 2007

please, i need the answer for this question quilckly

2007-09-11 06:50:17 · 12 answers · asked by BntMasr 2 in Other - Science

what would the answer be to this problem?
6+y=2

Can you figure it out and tell me how you got it?

this is what i got as an answer...

6 + y = 2
-6 - 6
y = -4

2007-09-11 06:47:11 · 7 answers · asked by Grace 3 in Mathematics

Hi everyone, I was wondering what the derivative of m^m is with respect to m, it seems you could use the product rule and get

d(m) * m^(m-1) + m * d(m^(m-1))
1 * m^(m-1) + m * (d(m) * m^(m-2) + m * d(m^(m-2)))
etc.

which would be just m^m again. But this makes d(m^m) be the same as d(e^m), so that can't be right, can it?

2007-09-11 06:44:44 · 6 answers · asked by Lee 2 in Mathematics

Limits. I've tried factoring it a million ways and it doesn't seem to work. Please show all work as I already know the answer but can't work the problem out. Thx :)

2007-09-11 06:40:32 · 5 answers · asked by CuriousKelly22 2 in Mathematics

How long will the fossil fuels: Coal, Oil and Natural Gas last?? Sources would be good too. Thankyou. xx

2007-09-11 06:39:19 · 3 answers · asked by Anonymous in Physics

How do I Solve the following equation for x by using the quadratic formula:

2x^2 - 6x - 2 = 0

(If there is more than one solution, separate them with commas.)

Thanks

2007-09-11 06:34:39 · 5 answers · asked by shauna s 1 in Mathematics

complete ordered pair for equation 2x+y=10

(5, ) ( ,10) ( ,-2) (0, )

2007-09-11 06:32:31 · 7 answers · asked by moni 1 in Mathematics

One number is 6 more than another. If the sum of the smaller number number and 3 times the larger number is 34, find the two numbers.

2007-09-11 06:30:43 · 5 answers · asked by moni 1 in Mathematics

i am so confused! and I'll get my book this week so I have no idea what to do!.help!

2007-09-11 06:27:38 · 5 answers · asked by Anonymous in Mathematics

Let a,b be nonnegative integers not both zero.
I am having trouble getting this proof started and I feel like I am missing something simple about primes that will help me get started. Thank you

2007-09-11 06:27:35 · 3 answers · asked by sh 1 in Mathematics

2007-09-11 06:20:16 · 3 answers · asked by Kerry H 1 in Geography

I live in central time zone and want to know how to calculate a time from universal to central since calenders use universal time(greenwich time zone).

2007-09-11 06:18:49 · 2 answers · asked by panseyissmiling 1 in Astronomy & Space

How do I factor

2z^2 + 11z - 21

Please explain it so I understand how you got your answer! Thanks!

2007-09-11 06:18:10 · 6 answers · asked by shauna s 1 in Mathematics

i have 2 products HCOOH and C2H5OH
i need them to react with H2SO4/ NaOH/ Na2Cr2O7/ PCl5/ NaBH4
to make as many organic products
please help!!

2007-09-11 06:17:42 · 2 answers · asked by mckenzie2 1 in Chemistry

Simplify the Fractional Expression:
(1-(x+h)/(2+(x+h))-((1-x)
/(2+x))/h (the whole thing is divided by h)

2007-09-11 06:17:16 · 2 answers · asked by Anonymous in Mathematics

my favourate image is this one taken by the cassini spacecraft as it was orbiting Saturn. The little bluish dot among Sutrn's rings is Earth, our home.
http://www.jpl.nasa.gov/images/cassini/2006-10-11/pia08329bright-browse.jpg

2007-09-11 06:16:20 · 7 answers · asked by Essien 3 in Astronomy & Space

2007-09-11 06:15:50 · 2 answers · asked by Teresa J 1 in Geography

2007-09-11 06:14:12 · 4 answers · asked by Anonymous in Mathematics

The x component of vector is -20.0 m and the y component is +54.0 m. (a) What is the magnitude of ? (b) What is the angle (in radians) between the direction of and the positive direction of x?

2007-09-11 06:12:52 · 5 answers · asked by Tastytaint 1 in Physics

I want to solve the problem below..

A gives B a start of 30 seconds in a km race and still beats him by 20 m. However, when he gives B a start of 35 seconds, they finish the race in a dead heat. How long does A take to run the km?

My Ans:
------------

Lets read the first statement:

"......A gives B a start of 30 seconds in a km race and still beats him by 20 m....."

this means , if B reaches 980 mt in t1 sec , A will reach 1000 mt in t1-35 sec.


Now lets read the next statement , it says ..

"...when he gives B a start of 35 seconds, they finish the race in a dead heat. ...."

this implies, If B reaches 1000 mt in t2 sec , then A takes t2-35 sec to cover the same 1000 mt.


so, I have got two conclusion from two statements .

now , what to do ?

Question is asking,

How long does A take to run the km?

Kindly,please DONT give me the soln .

please give me some hints so that i can solve it .

do u think , my above conclusion is correct ?

I am stuck .plz give hints

2007-09-11 06:03:54 · 7 answers · asked by calculus 1 in Mathematics

i dont want a long winded answer just a rough idea. Thanks.

2007-09-11 06:00:17 · 5 answers · asked by HoneyBadger 3 in Chemistry

Details of the Hydraulic system
1) Gear Pump delivers a flow of 4Ltrs/min
2) The system pressure is 100bar (direct pressure relief vave is used)
3) Hydraulic oil 68 is the oil medium.
4) The hydraulic system is used to actuate 2 vertical pistons (cylinder) simultaneously.
5) The pressure ports are blocked when the gear pump is started.

Problem:
1) Oil gets heated to 48°C within 20mins of operation.
2) As the oil gets heated the pressure drops from 100bar to around 40bar. In this case the pistons cannot be moved upward (due to the load-weight on the piston).
3) The relief valve is the hottest component in the system.
4) After the system is switched off for 30mins. The pressure comes back to the normal 100bar and then again after 20 mins of operation the sytem pressure drops again...and so on
1) Is gear pump the problem
2) Is the relief valve the problem.
3) Can the problem be due to suction strainers
4) Is the Hydraulic oil 68grade the problem

Please help

2007-09-11 05:59:06 · 4 answers · asked by katre_kedar 2 in Engineering

2007-09-11 05:55:25 · 3 answers · asked by Anonymous in Mathematics

A particle that has a mass of 2.28x10^-22kg and a charge of 3.29x10^-22C is traveling through space at 2.40x10^8m/s and encounters a magnetic field with an intensity of 2.41T. The particle is moving perpendicular to the field. If the particle's velocity remains constant, what will be the radius of curvature of its path?

just mainly need the equation to solve it, the book I'm using sucks but any help much appriciated :)

2007-09-11 05:48:14 · 3 answers · asked by jim 1 in Physics

Given that sinθ = 4sin(θ -60°), show that

(2√3)cosθ = sinθ

Hence find the value of θ such that 0° < θ < 180°

The answer is 74 if that helps

Thanks alot

2007-09-11 05:46:51 · 4 answers · asked by Anonymous in Mathematics

2007-09-11 05:45:55 · 6 answers · asked by shlompi 1 in Mathematics

2007-09-11 05:42:42 · 2 answers · asked by Anonymous in Physics

2007-09-11 05:41:48 · 4 answers · asked by Anonymous in Astronomy & Space

the last part of my question is (there were no more characters left):how many nails were there to start with?

2007-09-11 05:39:18 · 4 answers · asked by howmany nals wer ther2 startwid? 1 in Mathematics

if fluid drops from a barrel to the ground and when the barrel is empty there are roughly 2 square meters of fluid on the ground. How many liters (roughly) of fluid were inside the barrel?

2007-09-11 05:39:14 · 2 answers · asked by stan b 1 in Physics