Science & Mathematics - 11 February 2007

2007-02-11 21:12:49 · 10 answers · asked by Anonymous in Physics

how shall i do that? any book for that? am staying in delhi,india.

2007-02-11 21:10:49 · 2 answers · asked by Anonymous in Botany

2007-02-11 21:10:28 · 1 answers · asked by Moamen 1 in Medicine

*the slow acceleration of a large truck compared to that of a car.
*a car that still moves for a short period even after the brakes have been applied.
*a passenger standing in a fully loaded bus which is at rest tends to move backward when the driver suddenly starts the bus

2007-02-11 21:09:50 · 2 answers · asked by Anonymous in Physics

2007-02-11 21:09:30 · 1 answers · asked by Moamen 1 in Medicine

here is the problem:

you have 25 cards lying face down, consisting of 12 paired cards plus one odd card, all placed randomly in a five by five configuration.

your job is to pick out the pairs by a process of memory and elimination, until you are left with with the odd card face down. you may only turn over one card at a time, and if you fail to make a pair then both cards must be turned back over- like the kids game "husker du?"

question is, what is the probability that by pure chance, every pair of cards you turn over in sequence makes a matching pair until you are left with only the odd card i.e. you complete the 'game' in the fewest moves possible?

2007-02-11 21:09:28 · 7 answers · asked by bgnbgn00 2 in Mathematics

If the speed of earth increasing or decreasing? Will it be constant after some time?

2007-02-11 21:09:24 · 6 answers · asked by madhav 1 in Astronomy & Space

The liquid does not have to be pumped out but could be 'dumped', as long as the initiation of the dumping was controllable: though I assume I would need a way for air to enter the container at the same rate as the liquid left. Would it be possible in theory, for instance, to empty a 10,000 litre tank in 10 minutes? How about 2 minutes (which is 100 litres per second)? What kind of difference to the flow rate would the type of liquid make? Any idea of the diameter of the outlet pipe?

Any help appreciated with these questions, which relate to a writing project.

2007-02-11 21:09:24 · 6 answers · asked by neilcam2001 3 in Engineering

Did the planets, moons and sun ever aligned in one straight line? If they ever were, what happened then? And, if they never aligned before, will they ever?

2007-02-11 21:08:17 · 7 answers · asked by Firdaus Yosman 3 in Astronomy & Space

m^2
over
9
over
m^4
over
18

pleasee help me !!!!!!!?????????

2007-02-11 21:06:42 · 2 answers · asked by Anonymous in Mathematics

Sound Resonance

1. Measure the distance from he open end of the tube to the water level. Record this as the first resonance length(L1)

2. Determine the second resonance by allowing the level of water to go down further until the loudest sound is produced.

3. Measure the distance from the open end of the tube to the water level. Record this as the second resonance length(L2)

4. Carefully measure the inner diameter of the tube by using a vernier caliper and record it. From the inner diameter, determine the inner radius and then take 57% of the inner radius as correction "c" factor which is to be addedto the measured resonance lengths

5. Compute the speed of sound in air from the equations:

First resonance: V1=4f(L1+C)
Second resonance: V2=(4f(L2+c))/3

2007-02-11 21:05:41 · 1 answers · asked by jppd12689 3 in Physics

Hello Guys, I would really appriciate if some one could provide me with a list of know periodic comets and the (future) dates when they can be seen from the earth. I donot want the dates of the perihelions but the dates when they can be seen from earth.

2007-02-11 21:05:38 · 3 answers · asked by anecentric 2 in Astronomy & Space

2007-02-11 21:04:08 · 1 answers · asked by Moamen 1 in Medicine

For the quadratic equation ax^2 + bx + c = 0,
the discriminant is D = b^2 - 4ac.

1) When D > 0 - There are 2 different real solutions
2) When D = 0 - There is a repeated real solution
3) When D < 0 - There are 2 different complex solutions

There is supposedly a common element(s) in the quadratic equations whose discriminant equals 0 and has a repeated real solution . What is common between all quadratic equations that have a repeated real solution or where D = 0?????

Here are some quadratics with a repeated real solution:

x^2 + (2 square root 2) + 2= 0
D = b^2 - 4ac
D = (2 square root 2)^2 - 2x4x1
D = 8 -8
D = 0 =0
Therefore there is a repeated real solution

x^2 -10x + 25 = 0
D = b^2 - 4ac
D = (-10)^2 -4x25x1
D = 100 - 100
D = 0 = 0
Therefore there is a repeated real solution

SO WHAT IS COMMON BETWEEN ALL THESE QUADRATIC EQUATIONS??????????????

2007-02-11 21:02:41 · 4 answers · asked by Peter H 1 in Mathematics

This is to do with a power system but I assume that the equation will be similar.

2007-02-11 21:02:36 · 2 answers · asked by Anonymous in Engineering

what is the diameter of a pipe which carries cement to a silo top, if initial pressure,delivery height,flow rate are available?

2007-02-11 21:00:36 · 2 answers · asked by raseem_ar 1 in Engineering

I would just like to ask if anyone knows where to find information on scientific studies about the Ozone depletion over the antarctic. I have done some searching and am getting a small bit frustrated by not being able to find anything!
I searched Joe Farman but none of his work came up...same goes for sherwood and molina.

2007-02-11 20:59:03 · 2 answers · asked by PTP 4 in Earth Sciences & Geology

and other unicellular forms?

2007-02-11 20:58:52 · 1 answers · asked by babubhai 1 in Zoology

I am stuck on these last two problems and am now getting so tired that I can not hardley see striaght any more can some one please help me

1. simplyfy
1+(2/3)
-------
2+(1/2)
I am not sure how to set that one up I hope that works.

2. divide 5 over x^10 by 30 over x^5

is thsi one 6/x^15 I am sorry but I am not sure what to do

2007-02-11 20:54:45 · 5 answers · asked by Anonymous in Mathematics

A spherical planet {revoling around sun, if possible}, have gravitational acceleration on its surface equal to that due to sun. What will its shape become? Will it explode? What about matter on its surface? Take its ratation around itself into account.

2007-02-11 20:54:20 · 1 answers · asked by madhav 1 in Astronomy & Space

Let the function f(x,n,j) equal 1 when for a sequence of integers x of length n there is also a sequence of the same integer of length n+1 contained in some real number j and zero when this is not true. (For example, f(9,2,pi)=1 because there is a sequence of 2 9s at about the hundreth decimal place.)

Let the function f(x,n,j) be given in the form of a triple infinte series:
__________ n n n
f(x,n,j) = lim ∑ ∑ ∑a(x,q) + b(n,w) + c(j,e),
______ n →∞ q=1 w=1 e=1

where the varibles q, w and e are indicies of summation. Let the functions a, b and c be continuous everywhere.

(a) Is it true that

lim ∂f/∂j = k, k < ∞ ?
j→∞

(b) Is it true that for intervals (0, j) , (j+1, j+2), etc, that the following inequalities are always true?
j
∫f(x,j,n) dj <
0

2j
∫f(x,j,n) dj < ... n→∞
j

2007-02-11 20:53:04 · 1 answers · asked by Anonymous in Mathematics

also known as winged infusion set used for venipuncture in blood collection

2007-02-11 20:52:21 · 1 answers · asked by norma jean 1 in Medicine

2007-02-11 20:48:45 · 12 answers · asked by swami_nath01 1 in Astronomy & Space

hope you'll answer it immediately

2007-02-11 20:38:39 · 4 answers · asked by debbie 1 in Biology

1. point A moves along a unit circle at the rate of 2 units/second counterclockwise. What is the rate of change of the perimeter of the triangle whose vertices are points A, B(1,0) and C(-1,0) when A is at the point with coordinate (1/2, (sqrt3)/2).

2. Find the dimensions of the largest rectangle that cen be inscribed in a right triangle with sides of length 3 in., 4 in. and 5in. if two sides of the rectangle lies on the ;egs of the triangle.

3. Find the area of the largest rectangle that can be inscribed in an isosceles right triangle with legs of length a, if one side of the rectangle lies on the hypotenuse.

4. A fence 6 meters high is 6 meters away from a building that is 78 meters high. What is the length of the shortest ladder that can reach the building if one end of the ladder rests on the ground outside the fence.

5. Show that sinΘ≈Θ whenever Θ≈0 using differentials.

2007-02-11 20:37:46 · 3 answers · asked by Sammy Baby 1 in Mathematics

Answer me this... really easy

-3x+3 = 2x+8

hmm?

2007-02-11 20:37:16 · 6 answers · asked by bkanastoplus 2 in Mathematics

We were just wondering.

2007-02-11 20:31:06 · 2 answers · asked by Anonymous in Biology

A bull being a large ox. I am struggling to find my answer on google (gasp!), but i want to know if an ox is bigger or smaller than a bear.

2007-02-11 20:30:00 · 6 answers · asked by traaidmark 1 in Biology

3 men are checking into a hotel. The receptionist informs them that there is only one room available, for $30 however the room has 3 single beds. The 3 men decide to take the room and split the cost 3 ways and pay $10 each.

After they check-in the receptionist realises that he made a mistake. The rooms are discounted this evening to $25. As a result he's unsure of how to split the $5 refund between the 3 men. So he decides to give the three men $1 each back and keep $2 for himself.

So in total the men paid $27 for the room (3x$9). If the receptionist only kept $2 for himself, where did the last $ go?

2007-02-11 20:26:19 · 9 answers · asked by Anonymous in Mathematics

I just got one today...and have NO idea what it is...

2007-02-11 20:25:46 · 1 answers · asked by Anonymous in Zoology