Science & Mathematics - 25 September 2007

1. Why is tugor pressure not a feature of animal cells?
2.How Would A marine Fish react in a tank of freshwater?
3.Explain how to breakdown of ATP provides energy for cells.

2007-09-25 12:48:07 · 2 answers · asked by Anonymous in Biology

2007-09-25 12:48:02 · 3 answers · asked by caramel 1 in Biology

Okay I have two math questions that I need a little help with for school tomorrow.
The instructions state to Solve the following expressions:
2x^2+x-3
------------
4x^2-9

AND

21+11x+2x^2
------------------
3x^2-25x+18


^2 denotes squared
----- Over(or the devision line of a fraction)

2007-09-25 12:46:57 · 4 answers · asked by Lord Phoenix 1 in Mathematics

A pendulum is 0.8 m long and the bob has a mass of 1.0 kg. At the bottom of its swing, the bob's speed is 1.8 m/s. What is the tension in the string at the bottom of the swing?

2007-09-25 12:39:24 · 2 answers · asked by hehasnoidea2001 2 in Physics

A. Another word for hypothesis.
B. A well-tested explanation that unifies a broad range of observations.
C. The same as the conclusion of an experiment.
D. The first step in a controlled experiment.

2007-09-25 12:39:10 · 6 answers · asked by redbeetlebug00 1 in Biology

(listed below are several observations. Make and inference based on each of these observations.

1. The ice cream in the freezer was melted.

2. The lights in the house went out during a thunderstorm.

3. Water is splashing down the window.

2007-09-25 12:39:08 · 2 answers · asked by Anonymous in Other - Science

A box sits on a horizontal wooden board. The coefficient of static friction between the box and the board is 0.25. You grab one end of the board and lift it up, keeping the other end of the board on the ground. What is the angle between the board and the horizontal direction when the box begins to slide down the board?

2007-09-25 12:38:20 · 2 answers · asked by Anonymous in Physics

How would you answer this?
(2r-s)(s^2+4r^2-4rs)

2007-09-25 12:37:51 · 4 answers · asked by Anonymous in Mathematics

Let delta-f1 = 1; delta-f2 = 3; delta-f3 = 5 ...
a.What is the pattern for the delta-f sequence? (Use words, de-
scribe)
b. What is a formula for the delta-f sequence? (don't use a recursive formula)
c. Find the sequence f that gives the delta-f sequence as it's
differences. Start with f1 = 1
d. Draw a conclusion.

I cant understand part c and d
to part b i have the answer 2n-1
where n is the term number as delta-f is an arithmetic progression.
Can someone plz help me with part c and d

2007-09-25 12:37:49 · 6 answers · asked by Hammad A 1 in Mathematics

why is it that no matter what time or day, the past always seems better?

2007-09-25 12:35:26 · 3 answers · asked by Anonymous in Physics

I'm having trouble with the following question.

Suppose A is a closed set and let x be in A. Let B = A / {x} so that B is the set A with the element x removed. Under what conditions is B closed?

So far, I know that x cannot be a limit point of A, since closed sets contain all of their limit points; but I'm having trouble coming up with any further condtions. Thanks.

2007-09-25 12:35:10 · 2 answers · asked by mobaxus 2 in Mathematics

2007-09-25 12:33:53 · 10 answers · asked by Anonymous in Mathematics

Ignore misspellings

2007-09-25 12:33:31 · 2 answers · asked by sun 2 in Earth Sciences & Geology

i dont know how to do this a need some help starting it

3) an objects is moving initially in the x direction at 4.5 m/s^2 when an acceleration is applied in the y direction for a period of 18 seconds. if the object moves equal distances in the x and y directions during this time, what is the magnitude of the acc?

2007-09-25 12:32:13 · 2 answers · asked by Arianna A 1 in Mathematics

Im thinking of becoming one. how much do they get paid? what exactly do they do and are they in a lab all day?

2007-09-25 12:30:51 · 2 answers · asked by e 2 in Earth Sciences & Geology

2007-09-25 12:30:21 · 11 answers · asked by Dancing Sheep! 4 in Mathematics

2007-09-25 12:29:05 · 3 answers · asked by Anonymous in Mathematics

I have a circular piece of paper. And I cut out a sector and connect the two radial edges together to make an open cone. What should the angle of the sector be in order to maximize the volume of the cone?

2007-09-25 12:26:15 · 3 answers · asked by i'MdAmAnn 2 in Mathematics

There are 55 blades of grass in 1 in.^2 of lawn. THere are 230 blades of grass in 4in.^2 of the same lawn. How many blades of grass are in 3 in.^2 of lawn?

2007-09-25 12:25:50 · 1 answers · asked by Marina d 1 in Mathematics

2007-09-25 12:24:55 · 2 answers · asked by poadancer 1 in Biology

Why did the people move to north america from asia????

and were the people traveling to north america asias?

2007-09-25 12:24:41 · 3 answers · asked by Anonymous in Geography

2007-09-25 12:24:13 · 4 answers · asked by Anonymous in Mathematics

Three point charges which initially are infinitely far apart are placed at the corners of an equilateral triangle with sides d. two of the pt charges are identical and have charge q. if zero net work is required to place the three charges at the corners of the triangle,

2007-09-25 12:23:25 · 1 answers · asked by Bryan s 1 in Physics

5j + 7 = 72

2007-09-25 12:23:03 · 1 answers · asked by cutepuppies007 1 in Mathematics

I'm very curious about this subject.
Can anyone help?

2007-09-25 12:20:23 · 3 answers · asked by Anonymous in Biology

I need help with this physics problem. I have been trying to solve this problem for 2 hours but I can't find the right answer.
Here's the problem:

A rocket moves upward, starting from rest with acceleration of + 29.4 m/s^2 for 3.98s. It runs out of fuel at the end of the 3.98 s but does not stop. How high does it rise above the ground?

In the back of the book the answer is 931 meters, but I want ot know how to get there.

Thank you for your help!!!!

2007-09-25 12:20:07 · 1 answers · asked by . 6 in Physics

A resistor with a tolerance of 5% has a nominal value of 2.2kohms at room temp (20 deg celcius) it is rated at 2500 PPM/deg celc. find the range of resistances expected at 90 deg celc


the notes for this question that are supposed to tell me how to do it say The normal range is 2090 to 2310. Add 17.5% to each...

where did 17.5% come from

2007-09-25 12:19:55 · 1 answers · asked by sn4ke1 3 in Engineering

what word goes with that??????

2007-09-25 12:19:42 · 1 answers · asked by Beatriz 1 in Earth Sciences & Geology

i don't get this at all!


Please help me!

2007-09-25 12:16:58 · 7 answers · asked by sarahbabe315 3 in Biology

Your lab partner will be Thomas. You estimated his wingspan and said "150cm". Then Thomas estimated your wingspan and said "120cm." After that, you guys went to go measure each other's wingspan. Thomas's actual wingspan is 150cm and yours is 145cm. Then both of you found the difference. Thomas's difference is 0, and yours is 25
Later, both of you estimated each other's height. You estimated Thomas's height and said "150cm". He did the same and said "130cm" You guys then found each other's actual height. His is 149 and yours is 146. After that, you guys found the difference. Thomas's difference is 1, and yours is 16.

Based on the results of your measurements, do you think there is a relationship between human wingspan and height? If so, what do you think it is? State you answer in the from of a hypothesis. ( Okay, fine. This is my homework. I really really really really really really really really need help. Please answer!) I'l choose best answer!

2007-09-25 12:15:17 · 3 answers · asked by Anonymous in Biology