Science & Mathematics - 29 October 2007

2007-10-29 09:51:16 · 23 answers · asked by brielle s 1 in Astronomy & Space

and tree-like ice forms from it? Im not too sure if im describing it right but i forgot the name of it. thunder makes the sand form branch-like shaped ice or something like that...

2007-10-29 09:50:27 · 3 answers · asked by curtismayfield? 2 in Earth Sciences & Geology

A 520. g piece of copper tubing is heated to 91.7°C and placed in an insulated vessel containing 57.0 g of water at 37.0°C. Assuming no loss of water and heat capacity for the vessel of 10.0 J/K, what is the final temperature of the system (c of copper = 0.387 J/g·K)?

2007-10-29 09:49:59 · 1 answers · asked by Heman8689 1 in Chemistry

A) dissovling agent of a solution
B) the liquid portion of a solution
C) usually water in living cells
D) the substance that is dissolved in solution
E) the dissolving agent of a soluton which is usally oxygen in living cells

2007-10-29 09:48:38 · 3 answers · asked by Anonymous in Chemistry

2007-10-29 09:48:24 · 3 answers · asked by Anonymous in Mathematics

Or even any activity on the surface from the lunar rover wheel tracks.?

2007-10-29 09:44:19 · 18 answers · asked by jimbo 555 1 in Astronomy & Space

7. Copper and sulfuric acid react to form copper(ll) sulfate and water and sulfur dioxide.
8. Hydrogen gas and nitrogen monoxide react to form water and nitrogen gas.

2007-10-29 09:43:47 · 3 answers · asked by Diamond E 1 in Chemistry

3lnx - ln3x + ln(12x^2)

explain how to do this please?

2007-10-29 09:42:20 · 4 answers · asked by Anonymous in Mathematics

and what's the name of the geometric figure which has the minimum eccentricity?

2007-10-29 09:41:53 · 1 answers · asked by Samanthaac 2 in Engineering

A rotational axis is directed perpendicular to the plane of a square and is located as shown in the drawing. Two forces, 1 and 2, are applied to diagonally opposite corners, and act along the sides of the square, first as shown in part a and then as shown in part b of the drawing. In each case the net torque produced by the forces is zero. The square is one meter on a side, and the magnitude of 2 is 3 times that of 1. Find the distances a and b that locate the axis. Note that a and b are not drawn to scale.

I'm not sure where to begin with this question. Can someone give me some tips? I'd greatly appreciate it.

Thanks.


Here is an image

http://www.webassign.net/CJ/p9-10.gif

2007-10-29 09:40:31 · 1 answers · asked by Anonymous in Physics

Why would the wind not be a practical source of energy?
Sources would be helpful, because I need two reasons.

2007-10-29 09:39:54 · 3 answers · asked by Terry S 1 in Earth Sciences & Geology

2007-10-29 09:36:52 · 9 answers · asked by kerrysueluvsyou 1 in Mathematics

2007-10-29 09:36:36 · 2 answers · asked by love*pink 3 in Chemistry

A solid circular disk has a mass of 1.2 kg and a radius of 0.19 m. Each of the three identical thin rods has a mass of 0.12 kg. The rods are attached perpendicularly to the plane of the disk at its outer edge to form a three-legged stool.Find the moment of inertia of the stool with respect to an axis that is perpendicular to the plane of the disk at its center. (Hint: When considering the moment of inertia of each rod, note that all of the mass of each rod is located at the same perpendicular distance from the axis.)


How would you go about doing this?

I'd appreciate any help.

2007-10-29 09:35:49 · 1 answers · asked by Anonymous in Physics

2007-10-29 09:35:07 · 3 answers · asked by Anonymous in Biology

Please work it out??

2007-10-29 09:35:01 · 2 answers · asked by Anonymous in Chemistry

the latitude of the first city is 22 degrees 17 minutes, the latitude of the second city is 34 degrees 31 minutes. approximate the distance between the two cities if the average radius of the earth is 3955 miles

2007-10-29 09:34:44 · 2 answers · asked by Anonymous in Geography

2007-10-29 09:33:37 · 4 answers · asked by Z@ck 1 in Earth Sciences & Geology

18. x^2+2x=13
20. 0=x^2-6x+3
22. 0=x^2-3x-6

2007-10-29 09:33:16 · 3 answers · asked by Diamond E 1 in Mathematics

2007-10-29 09:33:08 · 1 answers · asked by Kuk 1 in Biology

I have 5 integrals that I'm working on and I need everyone's help on these problems thank you very much who can answer these.
#1. The indefinite integral of (dx)/(1+sinx+cosx). (Hint: Let u= tan(x/2).
#2. The indefinite integral of (sqrt Tanx) dx
#3. The indefinite integral of sqrt(x-1)/sqrt(x+1) * 1/x^2 dx
#4. The indefinite integral of (dx)/(x^6-1).
#5. The indefinite integral of (x^2-1)/(x^4+3x^3+5x^2+3x+1) dx

Please I want to know every little detail of what you did in each part of the problem not just the answer. Once again I thank you for helping me if anyone should solve these integrals.

2007-10-29 09:33:06 · 2 answers · asked by Roger P 2 in Mathematics

Do I shade a certain side !? AH I need help!

2007-10-29 09:32:51 · 6 answers · asked by La Belle x3 2 in Mathematics

Verify (2cos3x)(sinx)= (2sinx)(cosx)-(8cosx)(sin^3x)

I've been working on this question forever and can't seem to figure it out. Would appreciate any help.

2007-10-29 09:28:29 · 1 answers · asked by ace33 1 in Mathematics

Toluene, C7H8, is used in the manufacture of explosives such as TNT (trinitrotoluene). A 1.500 g sample of liquid toluene was placed in a bomb calorimeter along with excess oxygen. When the combustion of the toluene was initiated, the temperature of the calorimeter rose from 25.000°C to 26.413°C. The products of the combustion are CO2(g) and H2O(l), and the heat capacity of the calorimeter was 45.06 kJ°C-1. The reaction was
C7H8(l) + 9O2(g) 7CO2(g) + 4H2O(l).

1) The number of joules liberated by reaction of the 1.500 g of toluene is __?___.

2) The number of joules that would be liberated under similar conditions if 1.000 mol of toluene were burned is __?___.

If you could explain or show work, greatly appreciated. Thank you!

2007-10-29 09:26:15 · 1 answers · asked by maxizdaname 1 in Chemistry

If so, are they hostiles? Or Friendlys?

2007-10-29 09:25:44 · 13 answers · asked by Anonymous in Astronomy & Space

4. Potassium metal and chlorine gas combine to form potassium chloride.

5. Aluminum and hydrochloric acid react to form aluminum chloride and gas hydrogen gas.

6.Calcium Hydroxide and phosphoric acid react to form calcium phosphate and water.

2007-10-29 09:24:15 · 5 answers · asked by Diamond E 1 in Chemistry

1. what is the inverse of the function f(x)={(6,27),(7,15),(11,5)} ??


2. what is the domain of the function:
y= sqrt(x+4)+2?

2007-10-29 09:24:08 · 2 answers · asked by Ayy Girl! 1 in Mathematics

Please give steps, details, reasoning, and sources please; I'm working on my discovery of the 11th dimension

2007-10-29 09:22:46 · 1 answers · asked by Elise C 2 in Mathematics

Our project is about paint! How do you differentiate between physical and chemical properties? Classify substances based on the physical and chemical properties? Site evidence o physical and chemical change? Idenify different kinds of energy given o or used in reactions?dentify reactants and products in any reaction? Demonstate that mss is conserved in all reactions?

2007-10-29 09:20:57 · 2 answers · asked by Anonymous in Chemistry

I have a quiz on this stuff but I was in the hospital getting my appendix out during this lesson. These are the sample problems my professor gave me to look out to help prepare me but my books are in my dorm and I can't find this stuff online anywhere! Please help!!!!!!

1.) Find the area of the region bounded by the given curve:
r= e^theta
on the interval:
(6/3)pi is less or equal to Theta is less or equal to 2pi

2.)Find the area of the region bounded by:
r = 8 - 5sintheta

3.) Find the area of the region inside:
r = 9sintheta
but outside:
r = 4

4.) Find the area of the region bounded by:
r = 10cos2theta

5.) Find the area of the region bounded by:
r^2 = 72cos2theta

6.) Find the area inside the loop of the following limacon:
r = 10 - 20sintheta

7.) Find the area of the region outside:
r = 5 + 5sintheta
but inside:
r = 15sintheta

Thanks! Any help on how any of these are done would be awesome!!!

2007-10-29 09:19:09 · 1 answers · asked by Alysse 1 in Mathematics