Science & Mathematics - 14 November 2007

subject to temperatures ranging from -64°C to +32°C. How much does the steel pipeline expand due to the difference in temperature?

2007-11-14 13:50:16 · 2 answers · asked by hockeywinger14 1 in Engineering

What Percent of 50 is 10?

What is 80% of 20?

16% of 125 is what number?

20% of what number is 48?


How do you do these?
and how are you supposed to tell what your supposed to do >__>?

2007-11-14 13:47:50 · 6 answers · asked by ... 3 in Mathematics

A.organization
B.revision
C.writing
D. outline

2007-11-14 13:46:41 · 1 answers · asked by Jillian 2 in Engineering

only growing only a few cm above the ground. Explain why a lack of transport vessels prevents moss from growing tall.

2007-11-14 13:45:59 · 3 answers · asked by Inquisitive 1 in Botany

True science states that in order for a theory to become a fact, it must be reproduced in a lad successfully many times over. Since noone was there in the beginning to record the exact conditions, any experiments must be based on unproven speculation. Therefore, the theory of evolution, is a faith based religion ( Humanism ), just as the theory of creation is. What is your response to this statment, and please show your reasons.

2007-11-14 13:44:03 · 11 answers · asked by Michael G 1 in Physics

Okay so a normal male and a female carrier for color blindness produce 6 female children and 5 males. None of the males are colorblind. Sooo... how do you find out how many females are color blind? and would this be an example of X-linked recessive?

2007-11-14 13:43:46 · 2 answers · asked by Anonymous in Biology

doing science fair need help

2007-11-14 13:42:50 · 4 answers · asked by Anonymous in Engineering

im just looking for some information on black holes. im interested in it. = ) . any information is apreciated.

2007-11-14 13:42:23 · 12 answers · asked by <3 2 in Astronomy & Space

True science states that in order for a theory to become a fact, it must be reprodused in a lad successfully many times over. Sence noone was there in the beginning to record the exact conditions, any experiments must be based on unproven speculation. Therefore, the theory of evolution, is a faith based religion ( Humanism ), just as the theory of creation is. What is your response to this statment, and please show your reasons.

2007-11-14 13:41:42 · 16 answers · asked by Michael G 1 in Biology

2007-11-14 13:40:49 · 3 answers · asked by Anonymous in Mathematics

A physics professor is pushed up a ramp inclined upward at an angle theta above the horizontal as he sits in his desk chair that slides on frictionless rollers. The combined mass of the professor and chair is m. He is pushed a distance x along the incline by a group of students who together exert a constant horizontal force of F. The professor's speed at the bottom of the ramp is v.

Problem:
Use the work-energy theorem to find his speed at the top of the ramp.

I've tried this problem over 7 times, please help

2007-11-14 13:40:09 · 1 answers · asked by Anonymous in Physics

2007-11-14 13:39:09 · 1 answers · asked by Anonymous in Other - Science

2007-11-14 13:38:43 · 11 answers · asked by Anonymous in Mathematics

I have 30 dollars to spend. I am making a complicated background for a play i am working on. Wood is to heavy, must be paintable, lightweight, and 8 by 10 feet (or four 4x5 feet pieces... etc.) Corrugated pads was my first idea but that was to expensive, and I only needed 10 pieces and they are sold in bulk only. PLEASE HELP! I dont know what to do.

You maybe rewarded for your answer ($$)

2007-11-14 13:34:41 · 4 answers · asked by Anonymous in Engineering

numbers on side are subscripts

2007-11-14 13:34:23 · 2 answers · asked by wearin00 1 in Chemistry

2007-11-14 13:32:04 · 7 answers · asked by Anonymous in Physics

2007-11-14 13:30:00 · 4 answers · asked by verymar 1 in Zoology

Elemental ananalysis of a compound results in the following data
65.45 % C
5.49 % H
29.06 % O

5.51 g of the compound fills a 192.0 ml bottle with a pressure of 4782.0 mm Hg at a temperature of 21.3oC.

2007-11-14 13:29:46 · 1 answers · asked by chem queen 1 in Chemistry

IN THE USA!

2007-11-14 13:29:44 · 9 answers · asked by Hey there Sexy Pants 2 in Geography

. DeltaHvap for the liquid is 23.6 kJ mol-1 at 81°C.
w=?
deltaE=?

2007-11-14 13:28:40 · 1 answers · asked by Joshua K 1 in Chemistry

Ok..
1.A football team has won 38 games out of 70 played and still has 50 games to play.How many of these games must they win in order that the percentage of games won for the entire season is 60%?

2.An open box is constructed by starting with a rectangular sheet of metal 10cm by 14cm. Square peices are cut out of the corners and the resulting flaps are folded upward to make a box. If the box is 2 cm deep, find its volume.

3.A man divides a basket of apples among his four neighbors. The first neighbor got half the apples, the second neighbor got one-quarter of the apples,the third neighbor received one fifth of the apples, and the fourth neighbor got 6 apples. How many apples were in the basket?

4. Paul and rachel decided to create their own thermometer scales. On Paul's scale water freezes at 30DegreesP and boils at 130DegreesP. On Rachel's scale water freezes at 0DegreesR and boils at 150DegreesR. What temperature on Paul's scale corresponds to a temperature of 30DegreesR?

2007-11-14 13:28:30 · 6 answers · asked by James R 1 in Mathematics

NH3 + O2 → NO + H2O

If the percent yield of the above reaction is found to be 94.20 %

2007-11-14 13:27:55 · 2 answers · asked by chem queen 1 in Chemistry

well, im currently learning about derivatives and everything dealing with derivatives... what is the process to find the eqn. of the tangent line given f(x).. please provide example

2007-11-14 13:26:49 · 6 answers · asked by PreTty in PiNk 2 in Mathematics

2007-11-14 13:26:25 · 3 answers · asked by Anonymous in Other - Science

Elemental Boron is produced in one industrial process by heating diboron trioxide with magnesium metal, also producing magnesium oxide.Write the unbalanced chemical equation for this process.

2007-11-14 13:25:52 · 1 answers · asked by Mio 2 in Chemistry

Consider the following data.
N2(g) + 2 O2(g) 2 NO2(g) DeltaH = 67.7 kJ
N2(g) + 2 O2(g) N2O4(g) DeltaH = 9.7 kJ
Calculate H for the dimerization of NO2 as shown below.
2 NO2(g) N2O4(g)

2007-11-14 13:25:40 · 1 answers · asked by Joshua K 1 in Chemistry

two 200 kg lead spheres are suspended from 200 m long massless cables.the tops of the cables have been carefully anchored exactly 1 m apart.what is the distance between the centers of two spheres?

i tried to use gravitional forces to calculate the distance,but here we have cables.
please help me get this question.
thanks

2007-11-14 13:25:19 · 1 answers · asked by Anonymous in Physics

2007-11-14 13:22:49 · 1 answers · asked by cLickiT 2 in Earth Sciences & Geology

2007-11-14 13:21:52 · 1 answers · asked by jrich 1 in Chemistry

2007-11-14 13:21:34 · 0 answers · asked by alley 2 in Earth Sciences & Geology