Science & Mathematics - 20 November 2007

with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table). Which isotope of boron is more abundant, boron-10 or boron-11?

Could you please show the steps in your results. (TIA)

2007-11-20 08:11:16 · 5 answers · asked by xxxladyxxx 1 in Chemistry

2007-11-20 08:11:09 · 5 answers · asked by Anonymous in Mathematics

why not white or any other colour for that matter??

2007-11-20 08:08:47 · 4 answers · asked by Anonymous in Other - Science

2007-11-20 08:08:34 · 7 answers · asked by Chelsie T 1 in Mathematics

I am looking for some websites that talk about various cloud formations. I do not want sites that just describe the clouds, but one that tells me about the wind currents and all of that junk. Thanks

2007-11-20 08:07:45 · 4 answers · asked by hurricane_x_hubert 1 in Weather

Graduated with two year diploma in mechanical engineering in 2001 and then Graduated in B.S chemical engineering in 2005 (with average grades).

Worked as an instrument engineer for one year after school in the mining industry. Just recently joined a construction firm doing contruction engineering to the oil and gas sector.

Ambition is to hold a managerial/senior position in a oil refinery down the road. But till now lacking pure technical experience. Most of my work presently involved project/construction managment that includes, estimation, budgeting, cost controling and helping the contruction phase of oil gas engineering as opposed to design.

My question is weather this experience will help me move into managment level at the oil refinery later on down the road or would I have to gain technical experience (which a few people suggest is good, but due to average grades finding it hard to break into the refinining enviroment directly) and plus lots of work politics.

Thx

2007-11-20 08:07:44 · 2 answers · asked by planck12 1 in Engineering

What is the integral of 4θ+cos8θ ?

That's theta, not 0.

I'd appreciate any help. Thanks

2007-11-20 08:06:22 · 4 answers · asked by yefimthegreat 1 in Mathematics

I need it for a project. Please & thanks.

2007-11-20 08:06:15 · 7 answers · asked by Valary 1 in Zoology

2007-11-20 08:02:51 · 4 answers · asked by germanmonkey1 1 in Mathematics

i know isoniazid that it can cause decrease in vit. B6.


but i am really confuse if the side effects of refampicin. is it also the side effect of refampicin to decrease vit B6?

by the way, refampicin and isoniazid are drugs for tuberculosis patient.

please this is our assignment. and i really need it. you can give me some links where you got your answer.

10pts for the one who answer correctly.

2007-11-20 08:01:15 · 1 answers · asked by Anonymous in Medicine

2007-11-20 08:00:40 · 2 answers · asked by Anonymous in Chemistry

Fill the tanks with the same type of gas. Determine how many miles they travel. Fill the tanks again. Determine the gas consumed by each. Calculate the equivalent amount of energy spent by each car (I need the equivalent amount of energy per gallon of gas). Calculate the energy per mile consumed by each car. I need to describe my procedure, record measurements and calculations. I just don't know where to start. Please help!

2007-11-20 08:00:32 · 1 answers · asked by Anonymous in Physics

Science and medicine. Ariana took 2 h longer to drive 360 mi on the first day of a trip than she took to drive 270 mi on the second day. If her speed was the same on both days, what was the driving time each day?
so how do I go about doing this problem can you show me step by step so i can do another one kind of like it? thanks

2007-11-20 07:59:47 · 2 answers · asked by blue_eyed_woman_23 3 in Mathematics

2007-11-20 07:57:30 · 4 answers · asked by pol7 1 in Mathematics

What is 32 to the 2/5th power?

and how do you find that answer?

THANKS!

2007-11-20 07:57:22 · 2 answers · asked by Anonymous in Mathematics

2007-11-20 07:57:03 · 2 answers · asked by Anonymous in Physics

Please explain it to me, I am uneasy about these questions.

2007-11-20 07:56:28 · 9 answers · asked by Sarah I 2 in Mathematics

2007-11-20 07:54:41 · 13 answers · asked by Anonymous in Biology

A stone is thrown at 45degrees to the horizontal. It reaches its peak height after 1.50 seconds.

find (a) the vertical component of its initial velocity
- I done this and got 20.81m/s?

(b) the horizontal component of its initial velocity
- Would I be right in thinking this is the same as the vertical component (20.81m/s) as it is at an angle of 45degrees?

(c) the horizontal distance from the point where it was thrown to the point where it hits the ground.
- 62.43m? I assumed that my previous answer was right.

Also:
A rope is pulled with a 600N force attached to a boulder. The rope makes a 30degrees angle with the direction in which the boulder is travelling. Find the force which is pulling the boulder forwards and the force with pulls it sideways.

-Would this just involve finding the vertical and horizontal components? So 300N and 519.6N respectively?

Thanks a lot for your time =)

2007-11-20 07:53:25 · 2 answers · asked by Anonymous in Mathematics

A 57.0 kg person jumps from rest off a 11.0 m high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 3.00 m under the surface of the water. Determine the average force that the water exerts on the diver. This force is nonconservative.

2007-11-20 07:52:47 · 3 answers · asked by Anonymous in Physics

but you do feel a gravitational tug between you and the earth. Why is that?

2007-11-20 07:52:45 · 3 answers · asked by Hank z 2 in Other - Science

There are 7 girls on a bus

Each girl has 7 backpacks

In each backpack, there are 7 big cats

For every big cat there are 7 little cats

Question: How many legs are there in the bus?

2007-11-20 07:50:51 · 14 answers · asked by Kristin H 1 in Mathematics

2007-11-20 07:50:45 · 4 answers · asked by ang 1 in Chemistry

Ok this is a gr7 question. We are creating "ice devices". I have to create a device that will keep ice from melting. I have no clue on what to do. Although I will most likely put the ice cube in a shoe box and wrap the ice in aluminum and maybe sprinkle some salt over it. Any ideas on how I should create this "ice device"??

2007-11-20 07:50:20 · 7 answers · asked by soccergyal74 4 in Earth Sciences & Geology

For some time, a company named John Ellis ( www.johnellis.com ) has had a full page advertisement in Popular Science concerning their machine that produces miraculous water. It is much touted by many Dr.'s, and claims to have a hydrogen bond angle of 114 degrees, compared to regular water's 104 degree hydrogen bond angle... I have no expertise in this area, but am anxious to know if Dr.'s are indeed impressed by this machine. What exactly is a "hydrogen bond angle", and how does it concern me ??? I have visited their site, and still do not understand the information. If you could help me understand, I would really appreciate it.

2007-11-20 07:47:34 · 4 answers · asked by mobileminiatures 5 in Chemistry

An electron and a proton are each placed at
rest in an electric field of 520 N/C. Calculate
the speed of each particle 48.0 ns after
being released.

2007-11-20 07:45:08 · 2 answers · asked by Anonymous in Physics

2007-11-20 07:42:59 · 4 answers · asked by Slsigh 1 in Other - Alternative

Determine whether the series converges or diverges?

2007-11-20 07:39:20 · 2 answers · asked by Steve 1 in Mathematics

2007-11-20 07:37:00 · 2 answers · asked by drrivo80 1 in Chemistry

The burner on an electric stove has a power output of 2 kW . A 660 g stainless steel tea kettle is filled with 20 degree C water and placed on the already hot burner. If it takes 2.60 min for the water to reach a boil, what volume of water, in cm^3, was in the kettle? Stainless steel is mostly iron, so you can assume its specific heat is that of iron.

2007-11-20 07:31:49 · 1 answers · asked by Anonymous in Physics