Science & Mathematics - 29 October 2007

What is the ways is immunization is obtained?

I heard live virus, but I don't what it does. Plus wanting to know other methods as well.

2007-10-29 10:42:12 · 5 answers · asked by Doesntstayinvegas.com 3 in Biology

Find the absolute maximum value f on the given interval.
f(t) = 2cos(t) + sin(2t)
[0, pi/2]

Find the absolute maximum value of f on the given interval.
f(x) = e^(-x) - e^(-8x)
[0, 1]

2007-10-29 10:41:40 · 1 answers · asked by Anonymous in Mathematics

2x + 3y = 11
5x - 6y = 14

2007-10-29 10:40:21 · 5 answers · asked by lil-pwincess 2 in Mathematics

To move a large crate across a rough floor, you push on it with a force F at an angle of 21°, below the horizontal. Find the acceleration of the crate, given that the mass of the crate is m = 30 kg, the applied force is 325 N and the coefficient of kinetic friction between the crate and the floor is 0.46.


Thanks a lot again.

2007-10-29 10:40:17 · 1 answers · asked by acousticplaya90 1 in Physics

At equilibrium, the value of the reaction quotient, Qp, is 0.636. What will be the value of Qp if the total pressure of the reaction shown below is doubled?

A (g) ↔ 4 B (g)

the answer is 5.09 but why?

2007-10-29 10:38:57 · 1 answers · asked by Anonymous in Chemistry

Does the following make any sense? "Programmable logic devices enable the configuration of logic gates on a chip after it has been produced." This is for a school assignment where I have to find the relationship between logic gates and fpgas and this is what i came up with. Any information or feedback would be very helpful

2007-10-29 10:38:21 · 4 answers · asked by RS 2 in Engineering

is there a logical reason?

2007-10-29 10:33:12 · 8 answers · asked by Hmm? 3 in Biology

What is it? And where did it come from?
(HELPFUL websites are welcome! :-))

2007-10-29 10:32:11 · 2 answers · asked by Keda2404 1 in Mathematics

i want the formula in case of solution containing a solute and a solvent???

2007-10-29 10:30:50 · 2 answers · asked by Anonymous in Chemistry

A 1250 N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1980 N crate hangs from the far end of the beam.

a) Calculate the magnitude of the tension in the wire.


(b) Calculate the magnitude of the horizontal and vertical components of the force that the wall exerts on the left end of the beam.
Fx =
Fy =

Here is a drawing
http://www.webassign.net/CJ/p9-66alt.gif

there are so much information in this problem that I don't know where to start. Any help would be greatly appreciated.

Thank You.

2007-10-29 10:29:36 · 1 answers · asked by Anonymous in Physics

Does the first ramp have to be three times as long as the second ramp?
Why?

2007-10-29 10:29:31 · 5 answers · asked by Anonymous in Engineering

also 2 x (-4) x (-2)

2007-10-29 10:28:50 · 4 answers · asked by loghog751 2 in Mathematics

Hello, I need help to do this question.

1. One of the akali metals reacts with oxygen to form a solid white substance. When this substance is dissolved in water, the solution gives a positive test for hydrogen peroxide, H2O2. When the solution is tested in a burner flame, a lilac-purple flame is produced.

a) What is the likely identity of the metal? (i believe it is potassium)

b) Write a balanced chemical equation for the reaction of the white substance with water

Thanks

2007-10-29 10:27:53 · 1 answers · asked by gabucha 1 in Chemistry

The locus of points in the interior of an angle that are equidistant from the sides of the angle is the ______ of that angle.

please show me how to do this, im really lost!

2007-10-29 10:27:16 · 1 answers · asked by blahhhhhh 2 in Mathematics

2007-10-29 10:25:43 · 29 answers · asked by lil-pwincess 2 in Mathematics

2007-10-29 10:23:46 · 3 answers · asked by jim m 5 in Earth Sciences & Geology

In school We're going to do a debate on how the dinosaurs died...

2007-10-29 10:21:23 · 15 answers · asked by ♥jξm♥ ღஜƸ̵̡Ӝ̵̨̄Ʒஜღ 2 in Earth Sciences & Geology

A house painter is standing on a uniform, horizontal platform that is held in equilibrium by two cables attached to supports on the roof. The painter has a mass of 77 kg and the mass ofthe platform is 19.6 kg. The distance from the left end of the platform to where the painter is standing is d = 2.0 m and the total length of the platform is 4.9 m.
a) How large is the force exerted by the left-hand cable on the platform?
b) How large is the force exerted by the right-hand cable?

A uniform diving board, of length 5.0 m and mass 55 kg, is supported at two points; one support is located 3.4 m from the end of the board and the second is at 4.6 m from the end (see the figure below). What are the forces acting on the board due to the two supports when a diver of mass 63 kg stands at the end of the board over the water? Assume that these forces are vertical. [Hint: In this problem, consider using two different torque equations about different rotation axes.
Left support ____
Right support

2007-10-29 10:20:19 · 1 answers · asked by Pr0ject 1 in Physics

.............___|_A_|_---------O--|
P <-----|_B_40kg_|--------O..|
it's a single pulley connected to the two blocks and connected by its center to the wall. Block A is on top of block B with block B being pulled straight to the left (P)
u = 0.2 at all contact surfaces (neglect pulley friction)
A is 80kg
Determine the magnitude of force P required to move the 40kg plate B to the left.

2007-10-29 10:18:51 · 1 answers · asked by Anonymous in Physics

Thank you, Chad J, for inspiring this revision.

How did the first DNA sequence get encoded with the instant ability to absorb food and reproduce itself? Being the first one, it had nothing to "evolve" from. And, if it got it wrong, it would be gone within a few hours.

"How long will it take a monkey with a typewriter to randomly type just the first 12 letters of the abc in the correct order?" The probability is: once in 3 billion years! (assuming he continuously types 1 letter per second). [The formula is : 26^12 seconds]

And, if we want a team of monkeys to produce, just once, all the 26 letters of the abc in the correct order, how many monkeys will it take? The probability is: 400 trillion monkeys might do it once in 400 trillion years!

So, how did the first DNA get encoded with all its genes, each gene (not each atom) being the equivalent of one letter?

Or, maybe, all evolutionary time estimates are wrong, and life in the universe did start trillions of years ago?

2007-10-29 10:18:46 · 5 answers · asked by brandlet 2 in Biology

2007-10-29 10:15:45 · 15 answers · asked by lil-pwincess 2 in Mathematics

I have tried everything but I just cannot do it. Its driving me crazy!

It's the following:

8 quarts of cider were left in the punch bowl after the Halloween party. If, in addition, to the punch bowl, Shane and Kris had only 5-quart and a 3-quart container, how could they split the 8-quart evenly?

2007-10-29 10:14:07 · 4 answers · asked by lugjol 1 in Mathematics

2007-10-29 10:12:46 · 4 answers · asked by Kania M 1 in Astronomy & Space

Find the points at which the graph of the equation has a vertical or horizontal line:

25x^2 + 16y^2 + 200x -160y + 400 = 0

Need working out too please.

2007-10-29 10:08:05 · 4 answers · asked by Raja A 1 in Mathematics

2007-10-29 10:08:03 · 6 answers · asked by angel 1 in Mathematics

Calculate the energy difference (E) for the photon absorbed when a hydrogen atom undergoes a transition from n = 1 to n = 4 for 1 mol H atoms.

2007-10-29 10:02:21 · 1 answers · asked by Anonymous in Chemistry

Anyone know its for my homework and I can't find the answer anywhere

2007-10-29 09:58:41 · 2 answers · asked by tommykicksbut 1 in Botany

i need to know the answer to this problem
Fill in the blanks:
1, 1, 2, 3, 5, 8, 13, __, __

thanks in advance!,
taylor

2007-10-29 09:57:40 · 6 answers · asked by Anonymous in Mathematics

Can anyone tell me please

2007-10-29 09:56:58 · 2 answers · asked by tommykicksbut 1 in Botany

Please explain.

2007-10-29 09:53:24 · 9 answers · asked by lavorsker m 1 in Mathematics