Science & Mathematics - 25 October 2007

Can someone help show me how to use half-angle identities to evaluate tan(pi/16)? Thanks.

2007-10-25 17:18:02 · 3 answers · asked by lawllerzies 2 in Mathematics

http://i40.photobucket.com/albums/e215/xxs3xp1stolxx/module%20709/Picture6.png
http://i40.photobucket.com/albums/e215/xxs3xp1stolxx/module%20709/Picture7.png

2007-10-25 17:15:38 · 2 answers · asked by Anonymous in Mathematics

Two identical spheres of mass m and radius R are shot vertically with the same kinetic energy K . The first sphere is not spinning about its axis. The second sphere is spinning about its axis at angular frequency ω . What are the maximum heights of each sphere. The acceleration of gravity is g downward.

2007-10-25 17:14:04 · 6 answers · asked by Nik 1 in Physics

2007-10-25 17:13:03 · 1 answers · asked by Anonymous in Medicine

This is part of a very long question involving graphs so I won't post the entire thing. I understand most of it, but the final part I couldn't get was finding the initial velocity of a projectile on another planet. I don't know the angle of the projectile. (The x's, o's, and y's are supposed to be subscripts.) I figured out that:
vx = 43.9m/s
projectile starts at 74m
max. height reached= 84.3m
t= 3.5s for the whole trip (until it hits the ground)
a= 24.6m/s^2

I tried using d=voyt + 1/2at^2 and I got voy= 67.14m/s, but when I plugged this in to the pythagorous equation vx^2 + voy^2 = vo^2, I ended up with 80m/s, which isn't correct.
The answer is around 48m/s (give or take a little) but I don't know how to arrive at this. Please help. Any suggestions would be great. Thanks!

2007-10-25 17:12:50 · 2 answers · asked by kanimikala 2 in Physics

I am looking for serious answers, comical ones surely welcome however. I am in a debate as to whether sex outside of procreation is a need or just a want.

yes, I am aware I am posting in the biology section, as I figured it just made sense as to the context of the question.

2007-10-25 17:11:59 · 5 answers · asked by D 2 in Biology

what two-digit number is equal to three times the product of its digits????????

thanks if u helped
first answer = BEST ANSWER!
good luck

2007-10-25 17:05:07 · 4 answers · asked by arggg 2 in Mathematics

http://i40.photobucket.com/albums/e215/xxs3xp1stolxx/module%20709/Picture7.png

2007-10-25 17:02:51 · 2 answers · asked by Anonymous in Mathematics

Why is ATP an important energy molecule?
1. ATP is an essential part of DNA.
2. ATP is freely availale to all living cells.
3. Its phosphate bonds are easily formed.
4. It energizes other molecules by accepting
phosphate groups.
5. Hydrolysis of its phosphate groups is ex-
ergonic.

2 is not the answer

2007-10-25 17:02:01 · 2 answers · asked by hey there 3 in Biology

Thats how thin it is!!! We can't be letting it deteriorate!!!!1 Agree?

2007-10-25 17:00:50 · 1 answers · asked by Anonymous in Earth Sciences & Geology

in "dependent body region", or "dependent lung"? Thank you.

2007-10-25 17:00:23 · 2 answers · asked by Sword 1 in Medicine

If f(x)=1/x and the inverse of f(x) is called g(x).

Find the value of g(-1/3).

x

-1/3

1/3

-3

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2007-10-25 16:55:40 · 1 answers · asked by Anonymous in Mathematics

what mm lens?

2007-10-25 16:54:51 · 6 answers · asked by D_nel 1 in Astronomy & Space

A graph of | 3y + 4 | < 13 would show

dots on -5 and 3 and a line connecting them

circles on -5 and 3 and a line connecting them

dots on -5 and 3 and arrows going outward

dots on -3 and 5 and arrows going outward

None of these

2007-10-25 16:54:40 · 1 answers · asked by Anonymous in Mathematics

how did those people who landed the moon actually landed from the spacecraft to the moon and how do they get back to the spacecraft from the moon? i know they used Lunar module to actually land the moon from the spacedcraft but how did that work without the spacecraft land the moon? what would have happened if the spacecraft landed the moon?

2007-10-25 16:53:32 · 12 answers · asked by Anonymous in Astronomy & Space

Using each of the following scales, find the dimensions in a blueprint of an 8 ft-by-12ft room.

1 in.:2ft and 1 in.:4 ft.

please help me and explain how to do this! I really need this grade and would appreciate your help!

2007-10-25 16:53:15 · 4 answers · asked by Anonymous in Mathematics

We had to toss ours in the garbage many many yrs. ago
and unfortunately we were unaware back then that it wasn't a 'game' so we actually had many unpleasant experiences relating to a real life haunting, of course that was NOT fun whatsoever!! we all wished we'd never touched that stupid thing
at 1st it was just a bunch of gibberish, and we all laughed at it.
But then one week or two had contact w/something uncanny and it was negative ....
what are some of your S C A R Y experiences relating to the Ouija?
ty

2007-10-25 16:52:49 · 11 answers · asked by Shuggah Pie Sweets 3 in Paranormal Phenomena

I am a senior in high school and I applied to Juilliard.
I am a singer and actress and it is my dream to go there.
But my another dream of mine is to be a doctor.
So is it possible to graduate from a fine arts school like Julliard and then get accepted into medical school and become a doctor?

2007-10-25 16:52:38 · 8 answers · asked by Davis 1 in Medicine

The number 3002.05 can be written as 3 * 10^3 + 2 * 10^ (x) + 5 * 10^(y).

Given that x and y are integers, find the values of x and y.

ans is x = 0, y = -2

Please show me your workings clearly pls..thks

2007-10-25 16:50:36 · 3 answers · asked by Anonymous in Mathematics

find a formula for the amount of force per unit area coming from wind blowing at a speed of S mph. as a result, supposing the cyclist has an exposed area of 0.5m^2 , find how much power in watts the cyclist must put out to maintain a speed of 10mph in to a head wind 10mph.

ok i got help from a tutor and he helped me derive this formula
P=Vb*.5*rho*Cw*Ac*Vw^2

where
p=power
rho= density of air=1.2kg/m^3
Cw coefficient of wind resistance=.78
A= frontal area=.5
Vw= wind velocity=4.469m/s^2
I don't know what Vb means in this eqn.

Putting units in this formula
P=(m^2/s^2)*.5*(kg/m^3)*.78*.5m^2*(m/s)

but the units don't make sense to me i should get watts which =(kgm^2/s^2) right?
Thanks for any help.

2007-10-25 16:50:17 · 1 answers · asked by ♡♥EM♡♥ 4 in Engineering

y is directly proportional to x^2.
x is increased by 100%.
Find the percentage increase in y.

The ans is 400%

Please show me your workings and explain cos I don't understand..thanks!

2007-10-25 16:45:47 · 4 answers · asked by Anonymous in Mathematics

Name the shaded area..


http://mylovemylove.angelfire.com/venn/


Get ten points. :)

2007-10-25 16:45:38 · 8 answers · asked by Anonymous in Mathematics

find Int(Int) x dA over region D, where D is the region in the first quadrant that lies between the circles x^2 + y^2 = 4 and x^2 + y^2 = 2x

2007-10-25 16:44:54 · 2 answers · asked by Professor 1 in Mathematics

I was at my fathers house and in the back bedroom i heard weird noises like someone trying to come in the window and someone in the closet but nothing or no one was there i just thought someone was messing around with the house. well this went on for 2 nights while i was there. This has never happened before while i was there but i didnt pay anymind to it even though some of the noises were so loud it made me jump but i ignored it.. well i finally told my dad about it when it happened in the middle of the day in the same room while i was trying to rest. my father then infromed me that he saw someone walk threw our back fince into the back yard by the pool but noone was there when he went looking. My brother told me in the back room he saw a figure of a person it came right next to the bed an was just like watching him but didnt do anything and it would open the closet doors an a shadow would go on the walls around the room.. others that live in the home seen it as well. please help.

2007-10-25 16:41:14 · 12 answers · asked by Anonymous in Paranormal Phenomena

It seems like always CALIFORNIA, CALIFORNIA. Is it science or geography, is it possible for a huge fire of this intensity to occur in any other state in the U.S.?

2007-10-25 16:38:03 · 10 answers · asked by M.P. 2 in Weather

can you please do it step by step. we have a test tomorrow on this and i still don't really understand how to do it. i missed the day of notes.

2007-10-25 16:32:07 · 5 answers · asked by Angel*Eyesz 3 in Mathematics

If I remember the elements in a polyatomic ion, could i figure out the charge without memorizing it?

2007-10-25 16:30:39 · 4 answers · asked by Dmac 2 in Chemistry

Q. In three games Sherry's bowling scores were 109, 98, and 135, ressspectively. What was her total score for all three games? Use a "some and some more" pattern.
A. 342 Points
Q. What is the product of nine hundred ninteen and ninety?
A. 82080
Q. How many years were there from 1886 to 1986
A. 100 years
Q. List the factors of 28.
A. 1,2,4,7,14,28.
Q. Sal is 8 inches taller than Sammy. If Sal is 63 inches tall, how tall is Sammy? Use a "larger-smaller-difference" pattern.
A. 55 inches.
Q. 432 divided by 4
A. 108
Q. 423 divided by 6
A. 70
Q. 243 divided by 8
31 R. 5
Q. 2001 divided by 4
A. 500 R. 1
Q. 1020 divided by 10
A. 102
Q. 420 divided by (42 divided by 6)
A. 60
Q. Round 468 to the nearest hundred
A. 5
Q. 4657
+ 285
1223
A. 6165
Q. 3165
- 1635
A. 1430
Q. $10.00
- $08.93
A. $02.07
Q. 324
+ 56
17
73
25
19
A. 214
Q. 436
x 70
A. 29530
Q. $8.57
x 7
A. 60.99
Q. 600
x 900
A. 540000

2007-10-25 16:30:39 · 18 answers · asked by no 3 in Mathematics

the rest of that sentences and the initial height .
If a rock is thrown upaward with an intiail velocity of 32 feet pesecond from the top of a 40 foot building, write the height equatio using the information.

2007-10-25 16:29:14 · 1 answers · asked by Jennifer G 1 in Mathematics

I'm not sure how so yeah....

2007-10-25 16:26:42 · 11 answers · asked by thepizzaboy95 2 in Chemistry