Science & Mathematics - 6 December 2007

-(9-6a)-(10+5a)-6=-(2-5a)+(-a)+1

simplify your answer type an integer or fraction.

2007-12-06 11:06:04 · 2 answers · asked by JORGYPORGY 1 in Mathematics

have been trying to remember how to do this problem for while and I just can't! Please if anyone knows how to do this, I don't just want the answer I want to know how to do it. Please help :-)

x(squared) - y(squared) = 42 and x + y = 6, what is the value of x - y

2007-12-06 11:03:50 · 6 answers · asked by wolfkris 3 in Mathematics

The rotor has a Radius of 6m. If the Ride spins @ 20m/s, what is the minimum coefficient of friction that must exist between a rider and the wall?
[Fc is caused by Fnorm in this problem, therefore
Fc=Fnorm]

2007-12-06 11:01:21 · 2 answers · asked by alex s 1 in Physics

I recently watched the zeitgeist movie and I don't know weather I believe it or not so I'm looking for anyone that has done reasearch to show the other side that may prove it wrong or show it really is true,
Does anyone know of any falses?

2007-12-06 11:00:49 · 9 answers · asked by Ryderman 2 in Other - Alternative

k....The area of a circle is 2.0096 square inches. Use 3.14 as an approximation for the number [pi]

what is the diameter of this circle??

what is the cirsumference of this circle??

oh yeah if you answer can you show me how to do it! cause i wanna learn!!

2007-12-06 11:00:24 · 6 answers · asked by Anonymous in Mathematics

I know that the optional comma before the "and" in a list is known as the Oxford comma (example: We bought apples, bananas, and oranges...). Is there a similiar name for the optional 0 at the end of the decimal?

2007-12-06 11:00:24 · 3 answers · asked by emily 1 in Mathematics

if the area of the top is 0.2m^2?

2007-12-06 10:54:20 · 2 answers · asked by mjm13186 2 in Physics

Real Analysis:

Prove the intrsection interval from n=1 to infinity (0,1/n)=empty. (cant really do the intersection notation)... Notice that this demonstrates that the intervals in the nested interval property must be closed for the conclusion of theorem to hold.

Thanks!!

2007-12-06 10:51:20 · 2 answers · asked by Anonymous in Mathematics

In this context what are the roles of variable stars, supernovae, the Tully-Fisher relation and the Hubble flow.

2007-12-06 10:51:00 · 1 answers · asked by DoubleO 7 1 in Physics

How do we measure distances between galaxies?
In this context explain the roles of variable stars, supernovae, the Tully-Fisher relation and the Hubble flow.

2007-12-06 10:50:22 · 2 answers · asked by DoubleO 7 1 in Astronomy & Space

Prove for all n that exist in N (all natural numbers),
0 squared + 1 squared + 2 squared + ... + n squared =
n(n+1)(2n+1) all divided by 6.

I've gotten to the base case, but after that I'm lost on what to do for the inductive step.

Any help would be greatly appreciated. Thanks.

2007-12-06 10:47:46 · 4 answers · asked by Anonymous in Mathematics

2007-12-06 10:46:10 · 3 answers · asked by pyarali2 1 in Physics

This one problem has been bothering me, and I can't get it.

Can anyone help?

"A skier is pulled up a slope at a constant velocity by a tow bar. The slope is inclined at 25.0º with respect to the horizontal. The force applied to the skier by the tow bar is parallel to the slope. The skier's mass is 55.0 kg, and the coefficient of kinetic friction between the skis and the snow is 0.120. Find the magnitude of the force that the tow bar exerts on the skier."

2007-12-06 10:42:58 · 1 answers · asked by Anonymous in Physics

ok so i do not the answer to this so far everyone i have asked didnt know the answer either.

3 guys went to rent a hotel room and it was 30 dollars. each gave 10 dollars in. later the manager figured out that the room they were in was only 25 dollars so he sent a kid to give the men their money. the kid kept 2 dollars and gave each man 1 dollars back.

ok so if i lost you 10x3=30 but they each got a dollar back so they each gave 9 dollars. 9x3= 27 + the 2 dollars the kid took = 29 where is the other dollar to make it 30 dollars

2007-12-06 10:41:06 · 9 answers · asked by LIL Shady 2 in Mathematics

i really need help
please!

2007-12-06 10:30:35 · 2 answers · asked by Anonymous in Physics

How do you differentiate y=(x+3) / root x

2007-12-06 10:30:29 · 3 answers · asked by wag1 2 in Mathematics

Subtract these two fractions:
n/(5 - n) and 3/(n^2 - 25)

2007-12-06 10:30:12 · 4 answers · asked by Anonymous in Mathematics

2007-12-06 10:28:56 · 6 answers · asked by Timothy P 2 in Geography

Find the dimensions of a rectangular box with square base and open top with volume 38000 cubic centimeters which minimizes the amount of materials used.

2007-12-06 10:28:45 · 1 answers · asked by Anonymous in Mathematics

What if during your life people rejected you and always tried to get rid of you....then you die and become invisible and just want to be near people...and then THEY try to GET RID of you then too.!!!
Don't any of you ever feel sorry for them?What's wrong with letting them hang around if they don't cause any trouble:?

2007-12-06 10:25:24 · 11 answers · asked by Deenie 6 in Paranormal Phenomena

A plane flew 600 miles with a 30 mph tailwind. On the return trip, the plane flew 600 miles into a 30 mph headwind. If the total flying time was 4.5 hours, how fast does the plane fly in still air?

2007-12-06 10:25:23 · 1 answers · asked by Anonymous in Mathematics

Find two real numbers whose difference is 50 and whose product is a minimum. Enter the exact value of the smallest of the two numbers as your answer.

2007-12-06 10:24:39 · 2 answers · asked by Anonymous in Mathematics

using a 4 x 4 box how would you put numbers 1-16 (one in each box) and have them add up to 34, diagnonally, horizontally, and vertically.

All answers/suggestions are appreciated ASAP
Thank You

2007-12-06 10:21:58 · 4 answers · asked by Anonymous in Mathematics

2007-12-06 10:20:18 · 2 answers · asked by Lauren 1 in Botany

2007-12-06 10:12:25 · 3 answers · asked by bubbles 1 in Earth Sciences & Geology

2007-12-06 10:11:29 · 2 answers · asked by huzaifah k 2 in Biology

2007-12-06 10:09:49 · 3 answers · asked by Alexander 6 in Mathematics

It goes point A to R1 to +- battery (V1) to R2 to -+ battery(V2) to point B. The current flows from A to B.

If a current I=5 A exists between points a and b, R1=7 Ω, R2=8 Ω, V1=16 V, and V2=3 V,the voltage difference Va−Vb is

2007-12-06 10:08:41 · 1 answers · asked by bach454396 1 in Physics

Fireworks at Memorial Park are fired at an angle of 82 degrees with the horizontal. The technician expects them to explode about 300 feet in the air 4.8 seconds after they are fired. Find the initial velocity of a shell fired from the ground.

2007-12-06 10:02:26 · 1 answers · asked by BadCompany 1 in Physics

Prove without using the fundamental theorem of calculus:
∫ sec²(x) dx = tan(x) + C

2007-12-06 10:01:26 · 3 answers · asked by whitesox09 7 in Mathematics