Science & Mathematics - 11 September 2007

The difference of 2 numbers is 12. 2 fifths of the greater # is 6 more than 1 third of the lesser #. Find both numbers.
I NEED HELP, PLZ ANSWER!!!

2007-09-11 15:59:03 · 2 answers · asked by Nicky 2 in Geography

found in the feet and hands of human beings both an advantage and a disadvantage ?

2007-09-11 15:58:46 · 2 answers · asked by Shay J 2 in Medicine

10ml of Methanol is added to dry sand. The mixture was stirred until no more bubbling occur and the sand look uniformly wet.

Does this indicate that the dry sand and methanol are reacting?

I'm guessing yes, but is this a trick question?

2007-09-11 15:56:18 · 5 answers · asked by Nhat t 1 in Chemistry

-21 / 6 ?

2007-09-11 15:49:25 · 11 answers · asked by Anonymous in Mathematics

Two cars are traveling along a straight-line in the same direction, the lead car at 25.0 m/s and the other car at 33.0 m/s. At the moment the cars are 40.0 m apart, the lead driver applies the brakes, causing his car to have an acceleration of -1.90 m/s2.

(a) How much time does it take for the lead car to stop?
-----------s
(b) Assuming that the chasing car brakes at the same time as the lead car, what must be the chasing car's minimum negative acceleration so as not to hit the lead car?
--------m/s2
(c) How much time does it take for the chasing car to stop?
----------s

I am completely lost here, can someone please explain or at least help me in getting started off? Thanks so much!

2007-09-11 15:47:21 · 2 answers · asked by me 1 in Physics

A person walks 47 m East and then walks
31 m at an angle 44 degree North of East.
What is the magnitude of the total dis-
placement? Answer in units of m^2?

2007-09-11 15:47:05 · 1 answers · asked by Cantthinkofanickname 1 in Physics

A projectile is shot from the edge of a cliff h = 305 m above ground level with an initial speed of v0 = 105 m/s at an angle of 37.0° with the horizontal.

(a) Determine the time taken by the projectile to hit point P at ground level= .... s

(b) Determine the range X of the projectile as measured from the base of the cliff = .... m

(c) At the instant just before the projectile hits point P, find the horizontal and the vertical components of its velocity. (Take up and to the right as positive directions.)
horizontal= ... m/s
Vertical= .... m/s

(d) What is the the magnitude of the velocity?.... m/s

(e) What is the angle made by the velocity vector with the horizontal?

(f) Find the maximum height above the cliff top reached by the projectile.
...... m

2007-09-11 15:46:56 · 2 answers · asked by Nikita 1 in Physics

I had no idea it would be so hard to find a jar (or bottle I guess) online. Can somebody help? It has to be amber colored glass and contain 2-5 liters AND have a lid. Any help is appreciated.

2007-09-11 15:42:37 · 2 answers · asked by BunnuvaSitch 7 in Chemistry

2007-09-11 15:41:45 · 4 answers · asked by Pati A 1 in Mathematics

Solve the equation for the indicated variable

1/r + 2/1-r = 4/r^2 ; for r

2007-09-11 15:41:20 · 2 answers · asked by alexo 4 in Mathematics

ITS SOME TYPE OF ANIMAL I THINK

2007-09-11 15:41:16 · 17 answers · asked by colin h 2 in Biology

In the following calculation

( (5.70 ×13.35) − 7.2356 ) / 0.0010 + 1

the number 1 is defined as exact. Give the correct answer to this calculation with the correct number of significant figures.



anyone??

2007-09-11 15:38:42 · 1 answers · asked by matt b 1 in Mathematics

balance the following two only
1)K(s) + H2O(l) ----> KOH(aq) + H2(g)
2) Al(s) + Fe2O3(s) -----> Al2O3 + Fe(s)

could you please balance and classify the next four equations..thanks a bunch!

1) ___P+ ___O2 -----> ____PO3
2)___Al + ___H2C03----> Al2(CO3)3 + ____H2
3)___NaClO3+____-----> NaCl + ___O2
4)____Ag2SO4 +____AlCl3----> ___AgCl + ___Al2(SO4)3

2007-09-11 15:38:14 · 2 answers · asked by daniel n 1 in Chemistry

Decide whether this statement makes sense and explain why it does or does not.

4. This morning I saw the full moon setting at about the same time the Sun was rising

2007-09-11 15:36:22 · 9 answers · asked by meismeandimail 1 in Astronomy & Space

I am confused on how to go about this....

1. Evaluate: limit as n ---> infinite: (1^5 + 2^5 +3^5+...+n^5) / n^6 by showing that the limit is: integral symbol -with a 1 on top, 0 on bottom, x^5 dx ........and evaluating the integral.

2. Then we are supposed to evaluate from the previous problem the limit as n---> infinite of 1/n^4 (1^3 + 2^3 + 3^3 +...+n^3).

2007-09-11 15:34:41 · 1 answers · asked by AJ 1 in Mathematics

Find the molority

there is 15 grams of Potassium Nitrate in 2 Liters of water.


and i got 9.6M is this right?

2007-09-11 15:31:54 · 3 answers · asked by Anonymous in Chemistry

Answer Yes or No to each of the following questions:

Does every major religion today teach a story of origins?

Does evolution teach a story of origins?

Does every major religion today teach a future based on its beliefs?

Does evolution teach a future based on its beliefs?

Does every major religion today teach about God's power in the past?

Does evolution teach about God's power in the past?

Does every major religion today teach on human ethics
regarding the environment?

Does evolution teach on human ethics regarding the environment?

Do some religious people get angry when their beliefs are challenged?

Do some evolutionists get angry when their beliefs are challenged?

When a country internalizes religious beliefs can this lead to wars
and the killing of millions?

Theres your answer.....it is.

2007-09-11 15:30:52 · 12 answers · asked by krautpierogi 1 in Biology

(a) What was the takeoff speed? .... m/s
(b) If this speed were increased by just 6.0%, how much longer would the jump be? .... m

and also, this question : 2). A hunter aims directly at a target (on the same level) 120 m away.

(a) If the bullet leaves the gun at a speed of 200 m/s, by how much will it miss the target?
(b) At what angle should the gun be aimed so as to hit the target?



Please help me to do this problem and also please include the work. Thank you soo much for helping me to do this.. Thank You :)

2007-09-11 15:29:36 · 2 answers · asked by Nikita 1 in Physics

when they send a space shuttle to the space

2007-09-11 15:29:26 · 10 answers · asked by arito 1 in Astronomy & Space

I just need details about how they affect the blood vessels differently?

2007-09-11 15:29:24 · 3 answers · asked by Anonymous in Medicine

Find the slope of a line (a) parallel to and (b) perpindicular to each line.
1. y= -2x 2. y= 1/4x-6 3. x= -3

2007-09-11 15:27:14 · 3 answers · asked by LILREDGAL 1 in Mathematics

2007-09-11 15:24:29 · 11 answers · asked by m s 1 in Astronomy & Space

please help me!

2007-09-11 15:23:55 · 4 answers · asked by ladyitalkalot 1 in Mathematics

2007-09-11 15:23:22 · 2 answers · asked by whimsical_hyper_jynx 2 in Medicine

Point M is the midpoint of segment PQ. If PM = 23x + 5 and MG = 25x - 4, find the length of segment PQ.

2007-09-11 15:23:18 · 8 answers · asked by asdfghjkl 1 in Mathematics

any1 no any good ideas for a science fair project based on astronomy? i need one for tm and i cant think of anything that i can do. and i cant switch my subject.

2007-09-11 15:20:56 · 9 answers · asked by danthemainman01 1 in Astronomy & Space

Does the imaginary unit number "i" ("j" if you're an engineer!), the "square root of minus one" really exist?

2007-09-11 15:18:59 · 4 answers · asked by Anonymous in Mathematics

given line AB is congruent to line TU, find x if AB= x^2 (x squared) and TU=6x+16

2007-09-11 15:18:47 · 2 answers · asked by JOGOO 2 in Mathematics

I need to do the work for Chemistry class, and I am completly lost.

So far ive done : 450 m/s= (1 min/60 sec) (1hr/60 min)

The two "sec" cross out and the two "min."


Then I got stuck.

thanks!

2007-09-11 15:18:02 · 5 answers · asked by freedom.peace_love 1 in Chemistry

Use it in a sentence. please.

2007-09-11 15:13:18 · 14 answers · asked by Dancing girl.[: 2 in Engineering