Science & Mathematics - 14 October 2007

Last one and I'm done!

Please help me one last time!

(36a^2b^7) / (6a^21b^2) Write in simplest form.

2007-10-14 19:22:16 · 5 answers · asked by Anonymous in Mathematics

2007-10-14 19:20:46 · 6 answers · asked by i<3WL 2 in Mathematics

A quadratic function with roots 4/5 and 4/3 would be:

A) y = 15x^2 + 8x - 16
B) y = 15x^2 - 32x + 16
C) y = 15x^2 + 32x + 16
D) y = 15x^2 - 8x - 16

2007-10-14 19:19:52 · 4 answers · asked by Anonymous in Mathematics

A hot-air balloon stays aloft because hot air is less dense than cooler air at the same pressure. Suppose the volume of such a balloon is 500 m^3 and its mass (in addition to the mass of the hot air) is 290 kg. The surrounding air is at 14.0 C. At this temp the density of air is 1.23 kg./m^3. The pressure inside and outside the balloon is the same.

What is the density of hot air in the balloon if it hovers in equilibrium?

What is the Celsius temp of hot air in the balloon?

Please explain and show your work, so that I may understand.

2007-10-14 19:13:56 · 1 answers · asked by nita 1 in Physics

I am having a hard time w/ this one.. thanks!

2007-10-14 19:13:04 · 2 answers · asked by Anonymous in Biology

2007-10-14 19:11:30 · 4 answers · asked by Jasmine 3 in Weather

2007-10-14 19:11:29 · 4 answers · asked by futbolxavi_07 1 in Mathematics

Question: [H+] = 1.9x10^-6

pls help out, i have a few of the similar question, but no idea how to work it out. pls show me the wrking out. THX HEAPS

2007-10-14 19:07:20 · 1 answers · asked by Anonymous in Mathematics

A falling stone takes 0.30 s to travel past a window 2.2 m tall. From what height above the top of the window did the stone fall?

PLEASE show all calculations. thanks a bunch.

2007-10-14 19:02:35 · 3 answers · asked by cc 2 in Physics

tll me more about this question

2007-10-14 19:01:14 · 12 answers · asked by RAVINDER Kumar 1 in Zoology

Consider two particles A and B. The angular position of particle A, with constant angular acceleration, depends on time according to theta(t)=theta_0+omega_0t+0.5alpha t^2. At time t=t_1, particle B, which also undergoes constant angular accelaration, has twice the angular acceleration, half the angular velocity, and the same angular position that particle A had at time t=0.
How long after the time t_1 does the angular velocity of B have to be to equal A's?
___
ok, here we go:
i know that i have to write expressions for the angular velocity of A and B as functions of time, and solve for t-t1???
For A, omega(t) = omega_0 + alpha(t) and
for B, omega(t) = 0.5 omega_0 + 2alpha(t-t_1)
so when i equate them and solve for t-t_1, i get something that is not the right answer!

please help :(

2007-10-14 19:00:38 · 2 answers · asked by jaded20 1 in Physics

arcsin(3/4) basically means sin^-1(3/4) right? in my book the answer is .84806... and on my calculator it's 48.5904? what am i doing wrong? (im using a TI-89 btw)

2007-10-14 18:59:58 · 3 answers · asked by WOOOT 2 in Mathematics

Use the intermediate value theorem to show that there is a root of the given equation in the specified interval.

2007-10-14 18:59:01 · 3 answers · asked by helix.helix 2 in Mathematics

I know that a cosine function isn't a polynomial, but I can't seem to name any specific reasons why. Please help!

2007-10-14 18:58:31 · 6 answers · asked by Jess 2 in Mathematics

Would someone mind giving me a hand with this one! Thank you so much!

(15x - 5y) (17x -21y) Mulitply

2007-10-14 18:56:52 · 6 answers · asked by Anonymous in Mathematics

How do you add fractions with different denominators? You have to cancel them down or something...?? Plz help!!!! Thanks x

2007-10-14 18:52:52 · 8 answers · asked by breathfromanother 4 in Mathematics

Need some more Algebra Help if anyone would mind helping a girl out.

Thanks!

Find the x-intercepts. y = 2x^2 - 9x + 1

2007-10-14 18:52:47 · 1 answers · asked by Anonymous in Mathematics

2007-10-14 18:44:57 · 4 answers · asked by Anonymous in Mathematics

2007-10-14 18:43:59 · 6 answers · asked by lilmom101 1 in Astronomy & Space

Could someone give me a hand with this one. Thank you so much!

Solve.

√x - 1 = x - 3

2007-10-14 18:43:45 · 5 answers · asked by Anonymous in Mathematics

A particle is traveling along the x-axis. Its initial position is 20 meters to the right of the orgin and its final position is 125 meters to the right of the orgin. The particle travels from 20 meters to 65 meters at a velocity of 15 meters/second and from 65 meters to 125 meters to the right of the orgin at a rate of 60 meters/second. Find the average velocity of the particle as it travesl from its initial position to its final postion.

2007-10-14 18:43:22 · 4 answers · asked by lance3223 1 in Mathematics

husband had a vasectomy before we met. We would like to have a child. We just want to see if he has any little swimmers at all.

2007-10-14 18:42:32 · 6 answers · asked by Anonymous in Biology

Prove the formula for this:
1^2 + 2^2 + 3^2 + ... +n^2

2007-10-14 18:38:13 · 2 answers · asked by Anonymous in Mathematics

the computer club sells 50 more than three times the number the chess club sells. the computer club sells 134 pins. How many pins does the chess club sell?

2007-10-14 18:37:10 · 7 answers · asked by tonee12004 1 in Mathematics

Will humans ever evolve into an entirely new species? If so, when, and why would it happen? Will our bodies change over hundreds of thousands of years of industrialized life?

I predict intensive genetic engineering in the relatively near future (in terms of the history of science) and the creation of hybrid humans/machines in the more distant future (the next few centuries) if progress continues at this rate.

2007-10-14 18:35:53 · 11 answers · asked by SPQRCLAUDIUS 2 in Biology

What kind of proof is there? Where can I find the research on this?

2007-10-14 18:35:33 · 7 answers · asked by Willalee 5 in Earth Sciences & Geology

A movie ticket for an adult cost $8, and a child's ticket cost $5.50. One adult is taking a group of children to the movies. she has $35.00. How many children can she take with her to the movies?

2007-10-14 18:35:07 · 11 answers · asked by tonee12004 1 in Mathematics

Please explain the hard science, but also show the philosophical impacts and imaginative possibilities in laymen's terms. 10 points to the most complete yet user-friendly and imaginative answer.

2007-10-14 18:32:30 · 5 answers · asked by SPQRCLAUDIUS 2 in Physics

You wan tto go to Africa for a photo Safari. You need $2,800. you get 1,000 from savings and your family and you can save the $30.00 per week. How amny weeks will it take you to save up for the trip?

2007-10-14 18:31:59 · 4 answers · asked by tonee12004 1 in Mathematics

Word problems I'm not so good with anyone want to give me a hand I would greatly appreciate it.

A farmer in Texas is building a fence in the shape of a right triangle around some of his property. He knows the two shorter sides to be 9 ft. long and 10 ft. long. If the farmer must pay $10 per foot of wood, how much will he need to spend on the longest side of the fence? Round your answer to the nearest dollar.

2007-10-14 18:31:52 · 2 answers · asked by Anonymous in Mathematics