Science & Mathematics - 16 October 2007

An isosceles triangle has two equal sides of length 15 inches. The angle between the two equal sides is 32 degrees. Find the area A of the triangle in square inches. Sorry I don't have a picture but I'm hoping you can visual or draw out the picture yourself.

2007-10-16 14:18:28 · 3 answers · asked by aha51806 2 in Mathematics

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Which of the following compounds do not require resonance structures to provide a reasonable description ?

a) ClCCH

b) CO32-

c) NH3O

d) SO3 (central S)

e) O3

2007-10-16 14:16:57 · 1 answers · asked by tibsy2007 2 in Chemistry

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My teacher says that the area of a square is 25/36s inches squared.....?

She askes what is the length of the side. I say the answer is 25/36, but she says that the answer is 5/6.
Who is right?
please help
I am stuck because I dont know whether to accuse myself of being wrong or my teacher!?!

2007-10-16 14:16:51 · 11 answers · asked by cutiepie 2 in Mathematics

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Choose those statements that are true about the two best resonance structures for the molecule CNH?

a) There are a total of ten valence electrons in both of these resonance structures

b) The best resonance structure has a single bond between the carbon and nitrogen atoms

c) Neither resonance structure has a single bond between the nitrogen and hydrogen atom.

d) The best resonance structure has a triple bond between the carbon and nitrogen atoms

e) The best resonance structure has a negative charge on nitrogen

2007-10-16 14:15:26 · 1 answers · asked by tibsy2007 2 in Chemistry

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How does a salt solution may be used as a weed killer?

plz answer my question with the idea that plasmolysis is due to the loss of water from a cell.

2007-10-16 14:15:00 · 1 answers · asked by uknowimjennifer 1 in Biology

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word problem help please?

Barn painting- Melanie can paint a certain barn by herself in x days. Her helper Melissa can paint the same barn by herself in 2x days. Write a rational expression for the fraction of the barn that they completed in one day by working togeather. Evaluate the expression for x=5
any clues on how to do this

2007-10-16 14:12:08 · 6 answers · asked by Anonymous in Mathematics

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How do you find the kinetic energy of a gun?

How do you find the kinetic energy of a 27 kg gun that has just fired a 52.2g bullet with a velocity of 317 m/s.

If the momentum of the bullet is 16.547 kg*m/s shouldt the momentum of the gun be the same?

2007-10-16 14:11:53 · 1 answers · asked by finding.4ever 1 in Physics

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where does the sun not rise in the east??

2007-10-16 14:10:30 · 8 answers · asked by mrmac21 1 in Astronomy & Space

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help on a dificult proof?

cot^2- cos^2 = (cot^2)(cos^2)

2007-10-16 14:09:27 · 3 answers · asked by Anonymous in Mathematics

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Earthquakes in the west coast of Canada?

Can you please explain why the west coast of Canada has so many earthquakes?

All info welcome..thx@

2007-10-16 14:06:50 · 5 answers · asked by bubba habba 1 in Geography

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I know the answer is 282 J/degree C but i don't understand why?

A calorimeter is calibrated with an electrical heater. Before the heater is turned on, the
calorimeter temperature is 25.3 0C. The addition of 1.07 kJ of energy from the heater raises the
temperature to 29.1 0C. What is the total heat capacity of the calorimeter?

2007-10-16 14:02:27 · 1 answers · asked by Anonymous in Chemistry

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Two numbers differ by 8. Their product is to have the least value possible. Determine the numbers.?

This is word problems on quadratics .Explain the steps please, like What I did was let x be the smaller number and x-8 be the larger but I'm not sure if it shud be x+8 or x-8, pleae help. Explain in steps.

2007-10-16 14:02:13 · 3 answers · asked by Anonymous in Mathematics

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can some one please help me on difficult proofs?

tan^2+2/1+tan=1+cos^2

and

csc^2-cot/csc^2-1=cos^2

2007-10-16 14:02:09 · 1 answers · asked by Anonymous in Mathematics

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solve using the addition method and graph 4x-5y=3y+4 2x+3y=2x+1?

2007-10-16 14:01:49 · 1 answers · asked by veronica c 1 in Mathematics

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Chemistry lab, different forms of light, different wavelengths?

Looking through a spectroscope at a candle, hyrogen lamp, sun, and incendessent light bulb, I noticed they did not have the same wavelength of colors even though they are all forms of light. How come they differ?

2007-10-16 14:00:00 · 3 answers · asked by Anonymous in Physics

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Is horehound a weed?

I want to make a garden but I don't want to plant weeds. I'd also welcome any suggestions for non-weedy medicinal herbs.

2007-10-16 13:58:48 · 12 answers · asked by Anonymous in Botany

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How come the pulses in destructive interference cancel out?

Physics question relating to wave interference. (Please include several links explaining your answers.)

2007-10-16 13:58:47 · 2 answers · asked by Tony 2 in Physics

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algebra 1 ?.. its simple.. just forgot the real simple stuff!!!!?

okay...

b=ax solve for x... is it b/a =x? ..that ones the simplest one.. the more comlpexed ones i dont get... like F=mv2/r solve for r i dont really get... can you explain? [[[[ / = over.. not divide.. sorry]]

heres more ?'s

d=rt solve for r

I=Prt solve for P

and

m=x+y/2 solve for y

2007-10-16 13:57:28 · 5 answers · asked by Megan 2 in Mathematics

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whats relative humidity and wow is it measured?

2007-10-16 13:57:27 · 3 answers · asked by R dog 2 in Weather

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Some heat pumps have more than 100 percent effcy? Then why?

Why cant it be used in a closed loop system.

2007-10-16 13:56:04 · 6 answers · asked by theroadwetake 3 in Engineering

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Can someone help me do this chemistry problem?

Mix 200 grams of 90 degree celsius tea with 10 grams of 0 degree ice. find final temperature at equilibrium.

2007-10-16 13:53:28 · 1 answers · asked by BlackThought 3 in Chemistry

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Two Algebra problems. first person to get them both right gets best answer!?

#1) A bus traveling at 30 mi/h left at 11:45 a.m. A car following the bust at 45 mi/h left at noon. When will the car catch up with the bus?
#2) The sum of two consecutive numbers is 118. Fins the two numbers.

2007-10-16 13:53:15 · 5 answers · asked by Anonymous in Mathematics

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more 5th grade math?

use the numbers 0-9 so that each row and column =20
diagonals are not included

--- --- 8 4
9 --- --- 4
7 --- 3 ---
--- --- --- ---

which one dosen't belong and WHY...
36, 163, 68, 960, 1661, 62

the fact that 1661 has 4 digits dosen't count

2007-10-16 13:50:34 · 2 answers · asked by ? 1 in Mathematics

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Calculate the total energy of the system if both potential energies are zero at x = 0.?

A child's pogo stick (Fig P5.75) stores energy in a spring (k = 2.60 104 N/m). At position A (x1 = -0.100 m), the spring compression is a maximum and the child is momentarily at rest. At position B (x = 0), the spring is relaxed and the child is moving upward. At position C, the child is again momentarily at rest at the top of the jump. Assume that the combined mass of child and pogo stick is 25.0 kg.

Fig P5.75 http://www.webassign.net/sercp/p5-75.gif

(a) Calculate the total energy of the system if both potential energies are zero at x = 0.
J
(b) Determine x2.
m
(c) Calculate the speed of the child at x = 0.
m/s
(d) Determine the value of x for which the kinetic energy of the system is a maximum.
mm
(e) Obtain the child's maximum upward speed.
m/s

2007-10-16 13:48:58 · 1 answers · asked by Anonymous in Physics

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By how much does the gravitational potential energy increase during the block's motion?

A 5.0 kg block is pushed 2.0 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of = 30° with the horizontal, as shown in Figure P5.70. If the coefficient of kinetic friction between block and wall is 0.30, determine the work done by each of the following.

Figure P5.70 http://www.webassign.net/sf/p5_70.gif

(a) the force
J
(b) gravity
J
(c) the normal force between block and wall
J
(d) By how much does the gravitational potential energy increase during the block's motion?
J

2007-10-16 13:45:31 · 1 answers · asked by Anonymous in Physics