Science & Mathematics - 17 November 2007

1, _, _, 1/64

Fill in the blanks in this sequence with as many solutions as you can.

So far I got: 1/4, 1/16 or 4 and 16

2007-11-17 08:23:08 · 6 answers · asked by Anonymous in Mathematics

2007-11-17 08:23:00 · 1 answers · asked by spikoi 1 in Engineering

The air in the balloon is then heated to 60.°C, causing the balloon to expand to a volume of 4.50 103 m3. What is the ratio of the number of moles of air in the heated balloon to the original number of moles of air in the balloon? (Hint: Openings in the balloon allow air to flow in and out. Thus the pressure in the balloon is always the same as that of the atmosphere.)

i need a ratio as heated air over cool air

2007-11-17 08:22:58 · 2 answers · asked by Anonymous in Chemistry

(Ka1 = 7.2 10-3, Ka2 = 6.3 10-8, and Ka3 = 4.2 10-13).
(a) Which Ka value is most important to this buffer?
b) What is the buffer pH?

2007-11-17 08:21:11 · 1 answers · asked by Ecka 1 in Chemistry

2007-11-17 08:20:42 · 9 answers · asked by rainkimmy 1 in Chemistry

An insulated beaker with negligible mass contains liquid water with a mass of 0.240 kg and a temperature of 65.9 C.
How much ice at a temperature of -15.7 C must be dropped into the water so that the final temperature of the system will be 33.0 C?
Take the specific heat of liquid water to be 4190 J/kg K, the specific heat of ice to be 2100 J/kg K, and the heat of fusion for water to be 334 kJ/kg.

2007-11-17 08:20:26 · 4 answers · asked by John D 1 in Physics

Integrate (area integral) x*y dA where R is the region bounded by the graphs of y=(x)^1/2, y=(x/2), x=2 and x=4 would the bounds for x be 2 (lower) to 4 (upper) and the bounds for y be (1/2) (lower) (x)^(1/2) (upper) ?

Area Integral = Double Integral

2007-11-17 08:20:10 · 2 answers · asked by offycakes 1 in Mathematics

2007-11-17 08:19:50 · 6 answers · asked by Anonymous in Astronomy & Space

How many isomers (including all stereoisomers) exist for dibromopentadiene?

No, you do not have to draw out every single one. It is using the 2^n formul, where n=chiral centers along with subtraction for meso structures. I know you also have to factor in cis and trans possibilities with the structures as well.

I thought I'd put this in the right category, since I screwed up before.

2007-11-17 08:19:30 · 1 answers · asked by mosspoh 1 in Chemistry

If anyone could help me out with this question, that would be super!

Could you also show your work so that I may learn how to do it
Thanks!

2007-11-17 08:19:06 · 4 answers · asked by Anonymous in Mathematics

A capstan is a rotating drum or cylinder over which a rope or cord slides to provide a great amplification of the rope's tension while keeping both ends free
http://session.masteringphysics.com/problemAsset/1006856/15/36898.jpg
Since the added tension in the rope is due to friction, the capstan generates thermal energy.

A)
If the difference in tension (T_0-T') between the two ends of the rope is 520 N and the capstan has a diameter of 10.0 cm and turns once in 0.90 seconds, find the rate P_thermal at which thermal energy is being generated.
Give a numerical answer, in watts, rounded to the nearest 10 W.

B)
If the capstan is made of iron (with a specific heat capacity C=470 J/(kg C) and has a mass of 6.00 kg, at what rate dTheta/dt does its temperature rise? Assume that the temperature in the capstan is uniform and that all the thermal energy generated flows into it.

Note that Theta is a temperature.
Give answer in degrees Celsius.

2007-11-17 08:18:11 · 3 answers · asked by John D 1 in Physics

2007-11-17 08:17:56 · 1 answers · asked by techtor765 2 in Botany

Did we have an earthquake in California yesterday?

2007-11-17 08:16:01 · 6 answers · asked by Candy Cane 2 in Earth Sciences & Geology

1. What is the wavelength of a 19F+ ion which is moving with a speed of 4.255x10^5 m/s?

2. In what row or period of the periodic table do we encounter a d-electron? 4, 3, 5, 6, 2
I think the correct one is period 3?

2007-11-17 08:10:27 · 1 answers · asked by S281 2 in Chemistry

2007-11-17 08:05:31 · 4 answers · asked by ACANTHUS 2 in Zoology

Hi.

My husband said he heard that there are 90 billion 11-figure numbers in existence. 90 BILLION!!! Surely he's wrong. Does anyone know? Thanks.

2007-11-17 08:04:43 · 5 answers · asked by SMEG AND THE HEADS 5 in Mathematics

in waynesboro, MS??

2007-11-17 08:02:54 · 3 answers · asked by ◊junior c/o '11◊ 2 in Geography

1)A rancher wants to fence in an area of 3,800,000 square feet in a rectangular field and then divide it in half with a fence down the middle parallel to one side. What is the shortest length of fence that the rancher can use?

2)A rancher wants to fence in an area of 580 square feet in a rectangular field using fencing material costing 1.3 dollars per foot, and then divide it in half down the middle with a partition, parallel to one side, constructed from material costing 0.6 dollars per foot.
Assuming that the partition is parallel to the side which gives the width of the field, find the dimensions of the field of the cheapest design.
find the Lenght and Width and the cheapest design

2007-11-17 07:58:57 · 1 answers · asked by ramesh r 1 in Mathematics

2007-11-17 07:55:54 · 6 answers · asked by Anonymous in Geography

A) Calculate the pH of a buffer solution that contains 0.60 M NaH2PO4, and 0.15 M Na2HPO4.

B) What volume (L) of 0.408 M potassium hydroxide solution would just neutralize 100.6 ml of 0.380 M H2SO4 solution?

2007-11-17 07:55:16 · 1 answers · asked by Peter 2 in Chemistry

Do bacteria have chromosomes and chromatids?

2007-11-17 07:53:07 · 3 answers · asked by xxteresa 2 in Biology

2007-11-17 07:51:12 · 3 answers · asked by Anonymous in Botany

A company must manufacture a closed rectangular box with a square base. The volume must be 1160 cubic inches. The top and the bottom squares are made of a material that costs 5 dollars per square inch. The vertical sides are made of a different material that costs 2 dollars per sqare inch.
What is the minimal cost of a box of this type?

2007-11-17 07:51:08 · 2 answers · asked by Ksyha 1 in Mathematics

2007-11-17 07:48:33 · 1 answers · asked by edward g 3 in Chemistry

I already have a bsn and I am planning to be a nurse practitioner

2007-11-17 07:45:59 · 2 answers · asked by Anonymous in Medicine

If yes, please give me some examples. Do all scientific theories are constructed based on inductive arguments?
thanks a lot

2007-11-17 07:42:26 · 3 answers · asked by Wind203 4 in Other - Science

Doing Chemistry Need Help
Greatly Appreciated Thanks

2007-11-17 07:41:40 · 3 answers · asked by Anonymous in Chemistry

i would probably do a oad of experiments, but what experiments would you do?

2007-11-17 07:41:11 · 13 answers · asked by Anonymous in Astronomy & Space

does anyone know a good supplemental book to ace first year calculus that you can recommend? preferably would be nice if you've had first-hand experience with it (i.e. get a good grade with it)
thanks

2007-11-17 07:40:52 · 1 answers · asked by 킹세븐 2 in Mathematics

i dont get Related rate problems at all
can someone just teach me the steps of solving any type of related rate problem
i know derivatives but not related rates

2007-11-17 07:34:34 · 1 answers · asked by Anonymous in Mathematics