Science & Mathematics - 7 December 2006

Usual vacuum obtained inside a closed airtight container is 760 mm of Hg or 29 t0 30 inches... Can we increase this..ie., numerically reduce this value ?

2006-12-07 14:56:08 · 9 answers · asked by Ground zero 1 in Engineering

2006-12-07 14:54:49 · 7 answers · asked by Wafeeq 1 in Physics

1. A child throws a 5.40 kg package horizontally from a boat with a speed of 10 m/s. Calculate the resulting velocity of the boat, assuming it was initially at rest. The mass of the child is 25 kg and the boat is 55 kg.

2. An atomic nucleus at rest decays radioactively into an alpha particle and a smaller nucleus. what will be the speed of this recoiling nucleus if the speed of the alpha particle is 3.8 x 10^5 m/s? Assume the recoiling nucleus has mass 57 times greater than that of the alpha particle.

The answers from the back of the book are 1) -0.675 m/s
and 2) -6.7 x 10^3 m/s.

I don't understand how to get these answers so please show your work and explain. Thanks!

2006-12-07 14:54:27 · 2 answers · asked by hdwong58 3 in Physics

what's the deepest point in the world

2006-12-07 14:54:11 · 10 answers · asked by hey_finny 3 in Geography

my friend is trying these drugs which is pathetic and useless, but i need to know this answer, please be educated in some kind of way about this (e.g. experience, education in botany or other science/ medical fields)

2006-12-07 14:51:44 · 1 answers · asked by JC 1 in Botany

Find the x-coordinates of the curve y=x^3+3x^2+5 such that the tangent line is perpendicular to 45y=x-3=0.

tell me what you did, and WHY.

2006-12-07 14:51:09 · 8 answers · asked by Anonymous in Mathematics

If a certain two-digit number is divided by the sum of its digits, the quotient is 4. If the digits are reversed, the new number is six less than twice teh original number. Find the original number.

My homework may as well be gibberish. Any help is greatly appreciated, especially work that I could learn from on how to do it.

2006-12-07 14:47:47 · 8 answers · asked by fri_knight247 2 in Mathematics

tan(theta) = -1

2006-12-07 14:46:51 · 7 answers · asked by Mikey 2 in Mathematics

i'm not sure which one it would be, but i have it for math homework, and i'm not quite sure how to graph it if it's suppose to be a line, but then i don't know how y can be less than x^2 - 2. it's all really confusing and i can't figure it out.

2006-12-07 14:46:14 · 12 answers · asked by Anonymous in Mathematics

If so, then why isnt more being done to protect our environment??

2006-12-07 14:45:42 · 10 answers · asked by Anonymous in Astronomy & Space

2006-12-07 14:44:38 · 23 answers · asked by Marco Franco 2 in Earth Sciences & Geology

Do you get a positive or negative answer?

Example: (-3) / (-3) = ?

2006-12-07 14:42:55 · 15 answers · asked by okl49ers5 2 in Mathematics

The velocity function is v(t) = - t^2 + 6 t - 8 for a particle moving along a line. Find the displacement (net distance covered) of the particle during the time interval [-3,6].

2006-12-07 14:42:23 · 4 answers · asked by Anonymous in Mathematics

I'm trying to figure out 18.72% of 24% but I keep getting junk numbers.

2006-12-07 14:41:07 · 10 answers · asked by adamilsley 1 in Mathematics

Can anyone give me pointers on how to change your y intercept equation into standard form? and the other way around? Because I have a test tommorow on it and I really need to study! I will be awarding to the best answer! Thank you for your time!

2006-12-07 14:38:54 · 5 answers · asked by lindsey 3 in Mathematics

For example, if you have a 20% chance of success at something on each try, what is your total probability of being successful after 5 tries?

2006-12-07 14:38:17 · 11 answers · asked by Anonymous in Mathematics

The field in math is filled with countless formulas, yet many of us would disregard the concept behind such enigmatic equations, instead, we would just downright memorize it.

In school, what would you do, memorize the formula or understand the formula? (This is your answer and I would appreciate it if you would support your statement with some brief words)

2006-12-07 14:37:57 · 11 answers · asked by petswodahs 1 in Mathematics

If a dipoloid is half the number of a haploid, is there a specific number for the haploid?

2006-12-07 14:37:12 · 4 answers · asked by Kishine W 1 in Biology

6x² - 5x - 6

2006-12-07 14:36:05 · 3 answers · asked by Foxglove 2 in Mathematics

What is derivative of t^1/3

Is it one-third t to the power of -2/3?

How do you do one-third to the power of -2/3

is it third root of (1/3)t^-2 which is third root of (3/1)t^2

2006-12-07 14:33:03 · 16 answers · asked by Anonymous in Mathematics

what do u think about pluto is it a planet or not(help with homework)

2006-12-07 14:32:46 · 18 answers · asked by kaykay 1 in Astronomy & Space

Is this true or false and why?

2006-12-07 14:32:22 · 4 answers · asked by Anonymous in Biology

The asteroid's chance for hitting Earth on April 13, 2029 has now been categorized as a 4 on the Torino Scale. The level 4 rating -- never before issued -- is reserved for "events meriting concern" versus the vast majority of potentially threatening asteroids that merely merit "careful monitoring."

2006-12-07 14:29:57 · 13 answers · asked by Karuma 1 in Astronomy & Space

I need help with my biology homework. here is the question. A compound present in flying ointment, bufotenine from toad skin ______________nervous system. choices are listed below:

1) stimulates parasympathetic (or repair portion)
2) blocks the parasympathetic
3) stimulates the sympathetic (or energizing portion)
4) blocks the sympathetic
5) may act like an opiate like morphine

2006-12-07 14:29:35 · 1 answers · asked by Anonymous in Medicine

How do you find the number of terms in the following arithmetic sequence?
10, 15, 20,...., 250

2006-12-07 14:28:58 · 9 answers · asked by untilyoucamealong04 3 in Mathematics

Rosie garden is in the shape of a trapezoid is 16 m, one base is 20 m, and the area is 224 m2; find the length of the other base.

2006-12-07 14:28:49 · 2 answers · asked by mysteryperson 1 in Mathematics

it will be of good help if you answer me this question...thanks for every thing.

2006-12-07 14:27:20 · 11 answers · asked by miss kiss 2 in Mathematics

2006-12-07 14:27:07 · 9 answers · asked by Anonymous in Physics

2006-12-07 14:26:51 · 6 answers · asked by DeRon R 1 in Earth Sciences & Geology

I have a problem with cockroaches coming into my kitchen!

2006-12-07 14:26:11 · 5 answers · asked by Emmy 2 in Botany