Science & Mathematics - 23 October 2007

Every morning observers stationed on the Earth observe the Sun rise in the morning, move along arc of circle, and set in the evening. Apparantly the Sun is rotaing around the Earth at distance 1a.u. and period ~24 hours. The centripetal accleration of the Sun must be enormous. What is the force that causes the above described centripetal acceleration?

2007-10-23 08:25:02 · 10 answers · asked by Alexander 6 in Physics

2007-10-23 08:24:00 · 5 answers · asked by Kelly 3 in Botany

a x = -7
b x = 5
c y=-7
d y = 5

2007-10-23 08:22:17 · 4 answers · asked by Anonymous in Mathematics

Answer aint country but which race has the most ppl on planet earth?

2007-10-23 08:21:52 · 8 answers · asked by Anonymous in Earth Sciences & Geology

r=4e^2@, from 0 to 2pi

2007-10-23 08:21:35 · 1 answers · asked by garrett m 1 in Mathematics

i need to find out how levers forces work

2007-10-23 08:21:35 · 2 answers · asked by mankeyboy555 1 in Physics

How can I derive the quadratic formula?

2007-10-23 08:21:09 · 5 answers · asked by TPCAN 3 in Mathematics

r=4cos(@) and outside the curve r=3-2cos(@)....where @ equals theta or angle

2007-10-23 08:19:59 · 2 answers · asked by garrett m 1 in Mathematics

what are diamonds made of?

2007-10-23 08:19:03 · 4 answers · asked by Tina 4 in Earth Sciences & Geology

A=h(b1+b2)/2;for b

Please be pretty sure before you submit your answer!

2007-10-23 08:17:58 · 11 answers · asked by yo mama 1 in Mathematics

2007-10-23 08:16:12 · 4 answers · asked by aleksandar_gargi 1 in Engineering

The hydrophilic end of phospholipid molecules contains only hydrogen and carbon.

TRUE or FALSE

I think TRUE. My book seems to say that.

2007-10-23 08:16:08 · 1 answers · asked by LJC 2 in Biology

A 3.00-kg object is moving in a plane, with its x and y coordinates given by x= 5t^2 – 1 and y = 3t^3 + 2, where x and y are in meters and t is in seconds.

2007-10-23 08:14:14 · 1 answers · asked by Soare 1 in Physics

A rifle with a weight of 20 N fires a 4.5 g bullet with a speed of 210 m/s.
(a) Find the recoil speed of the rifle.
(b) If a 775 N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle.

2007-10-23 08:12:04 · 2 answers · asked by Anonymous in Physics

If compare the lead acid and sealed acid batteries,which are suitable for power substation

2007-10-23 08:11:11 · 1 answers · asked by Aseman 1 in Engineering

1-What is the closest Galaxy to our ? and how far ?
2-Are all stars discovered yet are in our galaxy or they discovered stars in other galaxies ?

2007-10-23 08:09:38 · 8 answers · asked by black moon 1 in Astronomy & Space

2007-10-23 08:09:22 · 3 answers · asked by Anonymous in Mathematics

Solve the polynomial inequality and graph the solution set on a number line. Express the solution set in interval notation.

x^2 + 4x + 3 > 0

2007-10-23 08:06:55 · 2 answers · asked by Brick Top 1 in Mathematics

2007-10-23 08:03:37 · 1 answers · asked by Anonymous in Biology

How can I correlate the lifetime of a spring relative to the percentage of it's elastic limit that the spring is expected to cycle through? Is there a rule of thumb or is can find a function that relates lifetime versus percentage of elastic limit? Thanks.

2007-10-23 08:03:07 · 2 answers · asked by mrlexington 2 in Engineering

I have 5 and 1/5, multiplied by 3/11

I have to make the 5 and 1/5 proper, right? Help I am so confuzzled.

2007-10-23 07:57:14 · 5 answers · asked by Confetti! 2 in Mathematics

plz n thnx!
<33
Kassy

2007-10-23 07:53:29 · 4 answers · asked by ♥Kassandra♥ 3 in Mathematics

2007-10-23 07:53:24 · 2 answers · asked by bete 1 in Chemistry

All right, I don't even know where to start with this one. Do I use F = -kx? What formulas should I use after that, or at all? This is frustrating me.

"A 10.0 g bullet is fired horizontally into a 108 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 159 N/m. The bullet becomes embedded in the block. If the bullet-block system compresses the spring by a maximum of 72.0 cm, what was the speed of the bullet at impact with the block?"

I don't think I'm supposed to use F = -kx to find the speed of impact, as F = ma and I don't know the acceleration. This, to me, doesn't sound right. What do I do?

2007-10-23 07:50:40 · 4 answers · asked by justme 4 in Physics

I really need to know the steps that you took to arrive at the answer.

Solve the quadratic equation by completing the square.
x^2 + 6x + 34 = 0

2007-10-23 07:50:26 · 6 answers · asked by Brick Top 1 in Mathematics

I live in south carolina...And know theres a SC mantis...but they are only said to be a few inches long. I have seen mantids in my yard much larger. 6 maybe 7 inches. could these be sc mantids ?

2007-10-23 07:43:35 · 3 answers · asked by rseverclear 3 in Zoology

pleasee help.. ihave alot of questions to answer like 50 and i dont understand half of them..ill give best answers votings

2007-10-23 07:43:05 · 3 answers · asked by gorskythug 2 in Mathematics

I am getting C12 H .... which is incorrect. The answer is C8 H8... can someone please show me why?

2007-10-23 07:42:20 · 2 answers · asked by Penmate 1 in Chemistry

pleasee i need helpp with this hard homeworkk

2007-10-23 07:41:14 · 2 answers · asked by gorskythug 2 in Mathematics

The problems are
What operation in arithmetic represents each of the following?
1) Decreased by
2)sum of
3)increased by

The second problem is
A car rental agency charges $40 per day and $0.20 a mile for each mile over 100 miles. If the charge for one day rental was $70, how many miles was the car driven?
How do you write an equation to solve this problem?
Write and solve this equation.
Is the solution of this equation of the solution of the problem? Why?

THANKS IN ADVANCE!

2007-10-23 07:36:53 · 4 answers · asked by babygirl 1 in Mathematics