Science & Mathematics - 11 November 2006

I need to know if the coefficient of friction will change if i change the load on a block. I believe that myu will not change unless you change the surface that the block slides on.

Do you believe that this is a valid answer?
Increasing the load will not change either coefficient of friction because the load doesn't effect the ratio of the force of friction to the normal force.

2006-11-11 08:26:57 · 6 answers · asked by Anonymous in Physics

I am doing a project is physics. I need to find out the potential energy of the machine. To find potential energy the equation is mass times gravity(9.8) times height. Is the mass the counterweight or the mass of the flying object in this case.

2006-11-11 08:25:38 · 3 answers · asked by korearepublicreddevils 1 in Physics

When you look up into the sky and see a commercia jet, many times you see a set of white trails that follow behind it. What exactly are those trails and how are they formed (scientifically)?

Thx in advance.

2006-11-11 08:20:12 · 5 answers · asked by Anonymous in Other - Science

Use the phase diagrams in Chapter 11 of your text to determine which of the following are true statements.


a) Above 31oC and 73 atm CO2 is in its supercritical state


b) For water the melting temperature increases as the pressure increases


c) For CO2 the melting temperature increases as the pressure increases


d) CO2 at 50oC and 2.5 atm is in the vapor state

NOTE THERE IS MORE THAN ONE ANSWER

2006-11-11 08:19:54 · 2 answers · asked by MARK 2 in Chemistry

2006-11-11 08:19:31 · 19 answers · asked by Mystery Man 1 in Mathematics

This magic is mostly known as "Melting Point".

Watch:
http://www.metacafe.com/watch/40754/stunning_illusion

http://www.youtube.com/watch?v=W7FaFPKUuD8

http://www.youtube.com/watch?v=vaVRIfBIisQ

Does anyone know the trick? Or any link explains it? Thank you.

2006-11-11 08:19:29 · 5 answers · asked by Anonymous in Physics

2006-11-11 08:17:40 · 3 answers · asked by shelleyr76 1 in Earth Sciences & Geology

2006-11-11 08:17:04 · 1 answers · asked by sophie r 1 in Medicine

does anyone have a simple explantation because i'm confused!!

2006-11-11 08:15:08 · 5 answers · asked by Charli 1 in Biology

If i have a 12v battery, and a 6v and 3v bulbs are connected in a circuit...what wud be the reading across each bulb when a voltmeter is connected??

2006-11-11 08:13:39 · 2 answers · asked by Anonymous in Physics

This is a topic of a research paper, I have no clue as to what the assignment is talking about. I know a lot about the K+ channel, I just dont know why its seem like Paradox initially.

2006-11-11 08:09:04 · 2 answers · asked by sph1nxed 2 in Medicine

2006-11-11 08:07:10 · 10 answers · asked by priyanka 2 in Biology

2006-11-11 08:07:04 · 2 answers · asked by Anonymous in Astronomy & Space

I hate fractions.

2006-11-11 08:06:48 · 9 answers · asked by roi 1 in Mathematics

What mass of steam that is initially at 120°C is needed to warm 370 g of water and its 300 g aluminum container from 20°C to 50°C?

2006-11-11 08:05:49 · 2 answers · asked by rhondasumpter 2 in Physics

I teach science, 6th gr. We have a new science curriculum that discusses in length the "Rock Cycle", see link:
http://www.minsocam.org/MSA/K12/rkcycle/rkcycleindex.html
My problem is this - Is it accurate to describe this as a cycle? It is obvious the Earth's crust has been shaped by erosion, but I don't think the ENTIRE surface has been through the "Rock Cycle" for even one cycle. It might be applicable to less than 1% of the mass of the crust, or more probably much less than even that. So, how can we describe this as a cycle if very little mass has actually been through it?! Is the terminology just for convience sake?

2006-11-11 08:02:29 · 2 answers · asked by mr_r_bowman 3 in Earth Sciences & Geology

How to solve the bouyancy force on a 500mm dia FRC pipe that has to be concreted at midsection (longitudinal) of the pipe?

2006-11-11 08:01:07 · 1 answers · asked by morning breath 3 in Engineering

Could animals evolve a useless organ like a pineal gland, or would this have some use in the course of evolution and become redundant later?

2006-11-11 07:57:32 · 4 answers · asked by Perseus 3 in Zoology

2006-11-11 07:53:42 · 5 answers · asked by chemist4god 1 in Mathematics

does anyone know how to fully prove the golden ratio. i've been to tons of sites and they all seem to skip some steps i need. i know that a+b/a = a/b and that eventually it comes out to 1+sqrt[5]/2 but how do you get to that?

2006-11-11 07:50:27 · 8 answers · asked by Bill s 2 in Mathematics

the motion of a particle on the x-axis is governed by the given equation: x=-11+12t+3t^2+4t^3-4t^4. find the location of the particle and the velocity when the acceleration is a maximum.

2006-11-11 07:46:45 · 6 answers · asked by crazy baby 1 in Mathematics

2006-11-11 07:45:33 · 4 answers · asked by lioness_01_cubb 1 in Zoology

the altitude of h of a rocket from its moment of launch untill it falls to Earth is given by h(t)=t^4-8t^3+375 where the altitude h is measured in ft n time is t in sec. a. what is the altitude of the rocket. b. when does the projectile impact earth? c. what is the maximum altitude? d. what is its maxu=imum upward velocity? e. what is the maximum downward velocity? f. what is its maximum upward acceleration? g. what is the maximum downward acceleration?

2006-11-11 07:44:37 · 2 answers · asked by crazy baby 1 in Mathematics

what is the result of hydroboration of propene followed by oxidation with HOOH (in basic conditions)?
thanks

2006-11-11 07:43:58 · 4 answers · asked by Anonymous in Chemistry

i have the number of moles i just don't know what to do next...
A volatile compound contains carbon, hydrogen and chlorine. A 256mL flask at 372.15 kelvin and 748 torr contains 1.097g of the compound. Calculate the molar mass of the compound. Use the ideal gas law to find moles first.

the number of moles =.00825 mol what do i do?

2006-11-11 07:42:53 · 5 answers · asked by jdaman12345 2 in Chemistry

Which of the following four statments are true for real gases and the corrections that must be made to the Ideal Gas Law?

a) the constant b in van der waals equation corrects for volume of real particles

b) the constant a in van der waals equation corrects for attractions between particles

c) the attraction of particles increases observed pressure

d) particles have finite volume

note may be more than one answer

2006-11-11 07:42:31 · 3 answers · asked by MARK 2 in Chemistry

2006-11-11 07:41:25 · 7 answers · asked by waltva 1 in Physics

and what would citric acid be?

2006-11-11 07:41:09 · 5 answers · asked by Anonymous in Chemistry

forgive the way i have written it. 1 over x + 2 over x. The answer is 3 over x. Why is this does anybody know.

2006-11-11 07:38:56 · 20 answers · asked by roi 1 in Mathematics

Also, why must they not be too close in value?

2006-11-11 07:37:38 · 1 answers · asked by Anonymous in Chemistry