Science & Mathematics - 15 November 2007

The springs unstreched lenth is 52.3 cm, its k= 125 N/m and the mass = 612 g. You hold the mass on top of the spring until its at equilibrium.
A) Find the length the spring is compressed.
B) If you let the mass go and let it fall on its own whats the length of the spring then at the bottom.

Thanks in advance

2007-11-15 10:25:37 · 1 answers · asked by Need help plz!!! 1 in Physics

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2007-11-15 10:24:23 · 3 answers · asked by catzarcute10 1 in Zoology

im in 7th grade and i have to do an image booklet from a-z. i have to have 26 pics that have to do with the planets, moons, solar system, and other things relating to astronomy. i need some thing that starts with K, N, Q, W, X, Y, and Z. pls!!!!

2007-11-15 10:23:24 · 2 answers · asked by Anonymous in Astronomy & Space

A force of 40 N is required to pull a 10 Kg wooden block at a constant velocity across a smooth glass surface on Earth. What force would be required to pull the same wooden block across the same glass surface on the planet Jupiter?

How would you go about solving this problem? Help please.

2007-11-15 10:23:12 · 1 answers · asked by AxNxG 2 in Physics

Current vacuum technology can achieve a pressure of
1.0 x 10^(-10) of Hg. At this pressure, and at a temperature of 30.0 degrees C, how many molecules are in 5.00 cm cubed ?

2007-11-15 10:22:53 · 1 answers · asked by gbutterfly339 1 in Physics

A gun that shoots corks of mass 0.0045 kg uses a spring of spring constant 9.6 N/m. The b = 0.22 m long spring is compressed to a = 0.13 m. Its 0.22-m long barrel exerts a constant 0.26 N force of friction on the cork when the gun is fired. What is the cork’s speed in m/s at the muzzle of the gun?

2007-11-15 10:22:24 · 1 answers · asked by Anonymous in Physics

2007-11-15 10:21:54 · 1 answers · asked by scotthero 1 in Mathematics

For the parabola y = 9/Nx^2 + 2x, find the zeros, vertex V(h,k), axis of symmetry and state how you know whether the optimal value (k) is a minimum or maximum

Plz show your steps in answering this question

Thanks a lot for all your help guys.
Really appreciate it.

2007-11-15 10:21:10 · 2 answers · asked by Supreme_edge 2 in Mathematics

2007-11-15 10:20:29 · 5 answers · asked by jr 1 in Chemistry

I am not asking for advice, but I am asking for EXPERIENCES with communicating with spirits(or ghosts). What were your reactions when they would try communicate? Have you asked the spirit (or ghost) to leave or do you allow it to stay & continue to communicate?

2007-11-15 10:20:00 · 15 answers · asked by 2 makes 1 4 in Paranormal Phenomena

I was just a reading a question/answers about the Ouija board and I have always been curious to know if there was any scientific explanation as to how they work. I realize there may be many different opinions as to the authenticity of the game but I just need to understand what makes it move without the mystic/religious hoopla reasons. Mind you I have played the game in groups and in solitare and can't figure out how the answers make sense, much less how it moves. I know I didn't push it and yet it answered in a coherent manner.

2007-11-15 10:19:00 · 8 answers · asked by BigV340 2 in Other - Science

i have electricity class and have problem answering these questions please help me the chapter were on is Sources of electricity , Chemical Energy

6) DC is an abbreviation for ___________________

7) As discussed in previous units Electrons travel from _____________ to ______________


8)The flow of electrons in a circuit is called ______________


9) Childern's toy, cell phone use _________________
as a source of electricity.

10)An instrument used to test for broken wires or burned out (open) fuses in ___

2007-11-15 10:18:05 · 4 answers · asked by babygirl 1 in Chemistry

I heard on the car radio today that the awful drought in Georgia is being eased by rain !!! Did you know that Georgia was in cricital need of rain? Did you know that many folks were praying for rain? I also heard that the Governor himself said the Georgians and himself needed to pray for rain. Do you think God heard those prayers? And that He sent the rain?

2007-11-15 10:17:46 · 13 answers · asked by Anonymous in Weather

A weather balloon has a volume of 52.5 liters at a temperature of 295K. The balloon is released and rises to an altitude where the temperature is 252k.

2007-11-15 10:15:17 · 1 answers · asked by Anonymous in Chemistry

I am having concerns about taking a prescription with another one
it said on another site with a mild warning but did not seem major

i know it's best to ask your doctor and should never take internet advice as an only option
but i figured if such a site exist i'd like to try it

thanks

2007-11-15 10:12:34 · 2 answers · asked by Anonymous in Medicine

Dear Yahoo Answers,
This is a really hard chem question and I am having difficulty with it. Please Help.

An Acid spill involves 2000 Litres of HCl solution that has a concentration of 6 moles of HCl per litre. Solid Ca(OH)2 is used to neutralize the spill. Calculate the mass of the calcium hydroxide required to do the job according to the equation;
Ca(OH)2 +2HCl = 2H2O + CaCl2 (4 marks)

I really need to figure this out and see the process that needs to be taken so any contribution will be appreciated.

Thanks.

2007-11-15 10:12:29 · 2 answers · asked by Anonymous in Chemistry

(This ride is a swing carousel)

An amusement parkride consists of a rotating circular platform 8.00m in diameter (radius = 4) from which 10 kg seats are suspended at the end of 2.50 m massless chains. When the system rotates, the chains make an angle (theta = 28.0 degrees) with the vertical.

here are the questions...

What is the speed of each child seat?
Find the tension in the chain when a 40 kg child sits in the seat (10kg + 40 kg)?

plz help

Thank you!

2007-11-15 10:11:41 · 1 answers · asked by Alex M 1 in Physics

Chemistry: Multiple Choice Help?
Hello. I need help with the following Chemistry Multiple Chocie Questions. Culd you help me please.

The following information is related to questions 7, 8 and 9.
25 grams of calcium carbonate is treated with excess hydrochloric acid and the reaction is described by the following equation:

CaCO3 +2HCl = CO2 + H2O + CaCl2

7) The number of moles of hydrochloric acid consumed is:
a) 0.10
b)0.25
c)0.50
d)0.75
e)1.00

8) The volume of CO2 formed at STP is
a)2.8L
b)5.6L
c)11.2L
d)22.4L
e)44.8L

9) The mass of water produced is:
a) 4.5 Grams
b)9.0 Grams
c) 18.0 Grams
d) 36.0 Grams
e)50.0 Grams


Any Contribution will be appreciated. Thanks.

2007-11-15 10:09:24 · 1 answers · asked by Anonymous in Chemistry

There are 9 squares but if you look closely there are 14 you have to reduce the number of squares to 2 by removing eight lines.

2007-11-15 10:02:24 · 5 answers · asked by Nikki 1 in Mathematics

2007-11-15 10:00:20 · 8 answers · asked by Anonymous in Earth Sciences & Geology

multipy!

2007-11-15 10:00:13 · 5 answers · asked by leer 2 in Mathematics

First determine the largest set on which
F(x) = (sum from n=1 to infinity) [e^(2nx)/e^(n*x^2)](1-x) converges pointwise. Then find the exact value of (integral from 3 to 4) F(x)dx.

In the first part, i found the interval of convergence as
(minus inf., -2] U (2,inf.). In the second part, i couldn't prove that f n converges uniformly on [3,4]. Can you help me with this?

2007-11-15 09:58:46 · 2 answers · asked by Anonymous in Mathematics

Question is that why there eyes bulge lol

2007-11-15 09:58:24 · 15 answers · asked by trickytrev 4 in Zoology

the complex number a+bi is a pure imaginary number when:
1) a=0 and b=0
2) a=0 and b does not =0
3) a does not = 0 and b does not = 0
4) a does not = 0 and b = 0

wat is the answer and why....please explain i dont understand the question....thanx for any help in advance

2007-11-15 09:57:10 · 8 answers · asked by Desilicious 1 in Mathematics

I know the period (T) of the object, the mass of the earth (obviously), the radius of earth, I can calculate the objects velocity but I do not know how to find the mass of the object. Thanks.

2007-11-15 09:56:30 · 1 answers · asked by Mark K 1 in Physics

air at 300k and bulk velocity 8 m/s flows over a flat horizontal plate with a temperature of 1000k at all points on its surface. given that
nu=0.32PR(1/3)RE(1/2)(TA/TS)0.117
calculate the heat transfer rate form one side over the first 100mm and the first 200mm.

Ta is the bulk air temperature, and Ts is the surface tmperature . the fluid properties should be obtained at the mean temperature

2007-11-15 09:55:14 · 1 answers · asked by Anonymous in Physics

2007-11-15 09:51:44 · 8 answers · asked by Anonymous in Weather

Can abilify cause a tremor that only occurs when you rest your limb? Or only a regular tremor at all times?

2007-11-15 09:50:50 · 3 answers · asked by Anonymous in Medicine

A spiral toy that can bounce down a flight of stairs is made from 80 feet of wire. Write and solve an equation to find how many of these toys can be made from a spool of wire that contains 4000 feet.

2007-11-15 09:50:01 · 3 answers · asked by haaaaahaaaa! 1 in Mathematics

Thanks.

2007-11-15 09:48:15 · 6 answers · asked by Dimples 5 in Astronomy & Space