Science & Mathematics - 4 February 2007

It would be nice to know what the procedure or rules you use to come up with your answer. I saw this question in a science competition.

2007-02-04 07:47:42 · 4 answers · asked by gmoore61 2 in Mathematics

I've heard that it's dangerous.....but how? And is it really possible to get high off of it? I'm not thinking of trying, but at the school dance last night tons of kids were breathing in balloon after balloon in the hallway to see how high they could make they're voice.

2007-02-04 07:46:11 · 9 answers · asked by Sarah 4 in Chemistry

2007-02-04 07:46:07 · 4 answers · asked by pigletsrus c 1 in Mathematics

2007-02-04 07:44:47 · 3 answers · asked by *believe_it* 4 in Biology

Tommorow where I live it is supposed to be -3 degrees with windchills of -30. Is thier any chance school will be closed because it is so cold or can temperature not close a school?

2007-02-04 07:44:25 · 9 answers · asked by mas52192 2 in Weather

The problem says: Perform the operation and simplify: 1/6 + 1/24
I know the answer is 5/24, but I need to know how to work it out to get that answer. I have tried. Those numbers are fractions I couldn't put them on top of each other.

2007-02-04 07:43:57 · 7 answers · asked by Eric 2 in Mathematics

2007-02-04 07:43:38 · 1 answers · asked by adam n 1 in Physics

when a cow listens to classical music its yield goes up by 3%. A 3% increase is 0.72litres. what was the original yeild?

2007-02-04 07:42:29 · 5 answers · asked by jenny 1 in Mathematics

2007-02-04 07:41:31 · 5 answers · asked by Anonymous in Earth Sciences & Geology

is dealing with factoring difference of squares and factoring when a is not 1

2007-02-04 07:39:58 · 6 answers · asked by Elizabeth V 1 in Mathematics

Figure 5-65 shows a kimchi container of mass m1 = 3.0 kg connected to a block of mass m2 by a cord looped around a frictionless pulley. The cord and pulley have negligible mass. When the container is released from rest, it accelerates at 1.0 m/s2 across the horizontal frictionless surface. What are (a) the tension in the cord and (b) mass m2?
the image is one mass sitting on a table attached to a rope and the second mass hanging offf the table

2007-02-04 07:38:58 · 1 answers · asked by bmschick2 1 in Physics

Holding on to a towrope moving parallel to a frictionless ski slope, a 50 kg skier is pulled up the slope, which is at an angle of 8.0° with the horizontal. What is the magnitude Frope of the force on the skier from the rope when (a) the magnitude v of the skier's velocity is constant at 2.0 m/s and (b) v = 2.0 m/s as v increases at a rate of 0.10 m/s2?

2007-02-04 07:36:19 · 1 answers · asked by bmschick2 1 in Physics

http://www.nhm.ac.uk/jdsml/nature-online/earthlab/support/mohs.gif

use that to help you

A mineral scratches a piece of fluorite but cannot be scratched by a piece of glass (hardness 5.5) what is this mineral's hardness?

2007-02-04 07:34:25 · 6 answers · asked by jazzy P 2 in Earth Sciences & Geology

My husband says its the one we call the 'saucepan' in the southern hemisphere but I thought it was in the north or is there more than one by that name?

2007-02-04 07:33:50 · 2 answers · asked by Kylie P 2 in Astronomy & Space

2007-02-04 07:33:45 · 5 answers · asked by Ron I 1 in Biology

Please try to explain your answer.

2007-02-04 07:33:06 · 4 answers · asked by BENNETH[[98]] 2 in Mathematics

It is currently -15 Celsius where I live.(Ohio,USA.)

2007-02-04 07:32:17 · 7 answers · asked by MaryBeth 7 in Weather

After robbing a bank in Dodge City, the robber gallops off at 10 miles per hour. The sheriff leaves to pursue him 9 minutes later, riding at 12 miles per hour.

If the sheriff rides for t minutes, write an expression for the distance D (in miles) between the robber and the sheriff. (D(t) should be positive.)

2007-02-04 07:29:25 · 2 answers · asked by Anonymous in Mathematics

I'm really lost on how to do this problem.

It says first make a substitution and then use integration by parts to evaluate the integral.

Integral 1 to 4

e^sqrt(x) dx

Any help will be appreciated :D.

2007-02-04 07:26:04 · 2 answers · asked by Anonymous in Mathematics

Write three quadratic equations, with a,b, and c (coefficients of x2,x and the constant) as:
1. Integers
2. Rational numbers
3. Irrational numbers

(The number 2 is to be above the x in the statement coefficients of .....)

2007-02-04 07:25:38 · 2 answers · asked by vmd7878 1 in Mathematics

2007-02-04 07:25:36 · 2 answers · asked by pumpkin 2 in Biology

1. Find b^2-4ac and the number of real solutions for the given equation: -x^2+8x-15=0.
My answer: -4, 2
2. You have a screen door whose height is 4 feet more than its width. You wish to stabilize the door by attaching a steel cable diagonally. If the cable measures sqrt194/2, what are the dimensions of the door?
My answer: 2 1/2 ft by 6 1/2 ft
3. Find the vertex for the graph of the quadraic function: f(x)=x^2-13
My anser: (0, -13)
4. Find all intercepts for the graph of the quadraic function:
f(x)=5x^2-38x+21:
My answer: (0,7), (-1, 64), (1, -12)
5. A battery manufacturing plant spends C dollars/hour to produce D size batteries. An effieciency consultant has determined that C is related to the number of batteries produced/hour, x, according to the equation C(x)=0.001x^2-2.6x+245. What number of batteries per hour minimizes the cost?
My anser is 245 batteries.

2007-02-04 07:24:31 · 2 answers · asked by hans d 1 in Mathematics

2007-02-04 07:22:58 · 7 answers · asked by mailman 1 in Mathematics

I have tried different methods (all that could come to my knowledge); it did not work!

2007-02-04 07:22:30 · 1 answers · asked by Angelina 1 in Mathematics

2007-02-04 07:22:27 · 7 answers · asked by Robby 2 in Mathematics

Does Magnesium react faster in Hydrochloric acid or does calcium. Also, does magnesium react in water?

2007-02-04 07:20:42 · 1 answers · asked by fashionistaqt 3 in Chemistry

2007-02-04 07:17:52 · 15 answers · asked by sayifkhan 1 in Biology

2007-02-04 07:17:48 · 5 answers · asked by R I 1 in Chemistry

2007-02-04 07:16:27 · 2 answers · asked by Anonymous in Biology

even many japanese people make mistakes in answer of this question :)

2007-02-04 07:15:31 · 2 answers · asked by goncae 2 in Geography