Science & Mathematics - 19 December 2007

to take my semester exam tomorrow over these kind of problems.


A rock is projected from the edge of the top of
a building with an initial velocity of 23:8 m=s
at an angle of 30± above the horizontal. The
rock strikes the ground a horizontal distance
of 96 m from the base of the building.
The acceleration of gravity is 9:8 m=s2 :
Assume: The ground is level and that the
side of the building is vertical. Neglect air
friction.
What is the horizontal component of the
rock's velocity when it strikes the ground?
Answer in units of m=s.

2007-12-19 12:50:58 · 1 answers · asked by americasnextopfashiondesigner 2 in Physics

Is the black sea the deepest mass of water in the world.
also have you noticed this hole ?
http://maps.google.com/maps?f=q&hl=en&geocode=&time=&date=&ttype=&q=black+sea&sll=10.466206,168.288574&sspn=10.077584,14.941406&ie=UTF8&ll=45.493834,32.174835&spn=0.449557,0.933838&t=h&z=10&om=1

2007-12-19 12:48:59 · 4 answers · asked by Anonymous in Earth Sciences & Geology

A 2.46 ?F ideal capacitor and a 300 ? resistor are connected in series with an AC source of 120 V (rms) and 60Hz. Find the average power delivered to the circuit. Answer: 3.45 W

Pave= Iv cos () 120 cos() v=IZ Z=Square(r^2+ (wl-xc)^2)

I think this is what you do but i can not get the right answer

2007-12-19 12:46:56 · 1 answers · asked by mastersource2005 5 in Physics

this will gain me 20 points on my upcoming midterm! please please please do help me. i don't quite understand this so can you please explain me how this works: origanlly "tamarino"(the food) is sour but when you mix it with ashes it becomes sweet:
heres the equation:
tamarino+ashes-> sweet tamarino

please if u know anything about this please help me! thanks so much! love you all =)

2007-12-19 12:46:53 · 3 answers · asked by Erica N 1 in Chemistry

2007-12-19 12:44:35 · 11 answers · asked by Angelina F 1 in Physics

Not yet in existance is a fair and reasonable answer. I was in Grade school watching it with a large group of kids on the black and white TV in the schools library.

2007-12-19 12:42:41 · 13 answers · asked by pete the pirate 5 in Astronomy & Space

Out of curiosity what is the worst thing that has ever happened to you that was caused by any kind of weather. It can be from thunderstorms, flooding, snow\blizzards, or anything else.

Just please don't tell any stories that involve death. I want to see what type of weather seems to cause the most problems. Also put in where you live. Thanks for any answers.

2007-12-19 12:41:38 · 10 answers · asked by sheori 4 in Weather

If the polynomial is not factorable, select “prime.”
( ^ = to the power of )

3a^2 + 4a – 4

the answer to this can be

(3a + 2)(a – 2)
or
(3a – 2)(a + 2)
or
(3a + 2)(a + 2)
or
prime


thanks tons!!

2007-12-19 12:41:32 · 2 answers · asked by Anonymous in Mathematics

2007-12-19 12:39:54 · 4 answers · asked by liliana g 2 in Earth Sciences & Geology

I need a wee bit of help s'il vous plait!! Lol
This is just a little bit of my home work that I am having trouble
with & if someone can explain this much to me I think I can
figure out the rest of my worksheet like this!
Please & Thank You!!


1)What products would CaCl2 + NaC18H33O2 form?

2)What ratio of drops of equal molarity would give you the largest volume of precipitate?(goes with problem #1)(please explain this!!)

3)Which of the following mixtures will make the largest amount of precipitate? Explain your reasoning.

(A) 100 mL 1.0 M AgNO3 +200 mL 1.0 M CaCl2
(B) 200 mL1.0M AgNO3 + 100 mL 1.0 M CaCl2
(C) 150 mL 1.0M AgNO3 + 50 mL 1.0 M CaCl2
(D) 50 mL 1.0 M AgNO3 + 150 mL 1.0 M CaCl2

2007-12-19 12:39:20 · 2 answers · asked by Anonymous in Chemistry

2007-12-19 12:37:02 · 14 answers · asked by Anonymous in Zoology

or slow in times of plenty?

2007-12-19 12:32:37 · 3 answers · asked by Steve W 1 in Biology

If u put 2 black holes parelle from 1 another will they pull eachother together or cancel it. also could a black hole that was the exact same size of another pull a the insides of eachother inside out and possibly revers the effects of a redgiant from exploding or will this just creat a rift in the universeallowing us to travel through dimensions

2007-12-19 12:30:05 · 7 answers · asked by Anonymous in Astronomy & Space

s(t) = -16t^2 + v0t + s0

We throw a rock into the air with initial velocity of 96 ft/sec, and initial position of 5 ft. Find how high the rock goes before coming back down. To answer this question, fill in the blanks in the following sentence, where the first blank gives this height, and the second blank gives how many seconds into the flight of the rock it reaches this maximum height.

The rock reaches its highest position of _______ feet above the ground after _______ seconds of flight


I'll take anything I can get. Thanks so much! And.... MERRY CHRISTMAS!

2007-12-19 12:29:17 · 4 answers · asked by Anonymous in Mathematics

What is Earth's temperature range? Not the temperature inside the Earth but from, for example, the North Pole to the Equator. Is there a website that gives this information?

2007-12-19 12:27:14 · 3 answers · asked by Anonymous in Weather

Also, how do I solve for x: x^2 + 5x + 4 = 0. If the solutions are complex numbers, then how do I give the solutions in the usual a + bi form!?!

2007-12-19 12:26:14 · 5 answers · asked by Anonymous in Mathematics

i cant tell

2007-12-19 12:25:53 · 5 answers · asked by Tanner P 1 in Geography

2007-12-19 12:25:38 · 6 answers · asked by Anonymous in Medicine

Okay-
My family is trying to figure out the name of this animal. It looks like a llama and they use it's wool to make things with. I can have really short legs and long necks. Can you help us out?!

2007-12-19 12:24:23 · 11 answers · asked by |~fashonista~| 2 in Zoology

when i die,i wish to donate my remains to science,maybe to use all of my vital organs for transplants and anything else that is salvagable to medical examiners to find cures for certain diseases.how do i go about accomplishing my desires?do i have to write a will or will my drivers license with the heart emblem be enough?

2007-12-19 12:22:48 · 11 answers · asked by CHER 6 in Medicine

2007-12-19 12:22:16 · 3 answers · asked by Anonymous in Engineering

I called a farm implement store and they had no idea.
I could use a few suggestions

2007-12-19 12:22:13 · 3 answers · asked by walt554 5 in Chemistry

2007-12-19 12:22:07 · 2 answers · asked by Anonymous in Earth Sciences & Geology

confused

2007-12-19 12:20:38 · 2 answers · asked by Anonymous in Physics

My teacher is having us take a christmas carol and re write the words using any topic that we have previously learned like photosynthesis or mitosis and etc.
and i dont know whats a good christmas carol and what should i say?

thanks :]

2007-12-19 12:19:47 · 2 answers · asked by Marie 2 in Biology

2007-12-19 12:19:12 · 3 answers · asked by Anonymous in Earth Sciences & Geology

2007-12-19 12:18:09 · 4 answers · asked by Anonymous in Earth Sciences & Geology

2007-12-19 12:17:30 · 1 answers · asked by isabel 3 in Earth Sciences & Geology

Ive read, and been told that some alloys are formed simply by melting the two metals and then mixing them together.

But alloys are homogenous (uniform) mixtures

If this really works, how come the metals mix evenly ? why dont they mix randomly so that the alloy is not uniform?

If this doesnt work, how are alloys formed? or are there any other ways to form alloys ?

2007-12-19 12:15:12 · 1 answers · asked by Anonymous in Chemistry

I'll see a spider in one part of my house, and then later on in the night I'll see them in my bedroom.

This happens at least twice a day. Is there a reason they're following me? Is it a smell?

2007-12-19 12:14:35 · 5 answers · asked by Lettuce 3 in Zoology