Science & Mathematics - 7 September 2007

2007-09-07 18:25:31 · 3 answers · asked by Anonymous in Geography

An insulated beaker with negligible mass contains a mass of 0.345 kg of water at a temperature of 60.4 deg. Celsius.

How much ice at a temperature of -11.2deg. Celsius must be dropped in the water so that the final temperature of the system will be 20.2deg. Celsius?

Take the specific heat for water to be 4190 J/(kg*K), the specific heat for ice to be 2100 J/(kg* K), and the heat of fusion for water to be 334 kJ/kg.

2007-09-07 18:23:35 · 2 answers · asked by Superman 1 in Physics

Rain drops fall on a tile surface at a density of 4798 drops/ft^2. There are 12 tiles/ft^2. How many drops fall on each tile? Answer in units of drops/tile.

2007-09-07 18:16:01 · 2 answers · asked by Anonymous in Physics

The figure shows an electric dipole. What is the direction (relative to the positive direction of the x axis) of the dipole's electric field at point P, located at distance r >> d?

in other words, positive i-hat direction? positive j-hat?? etc

http://www.s89.photobucket.com/albums/k239/blueray4/?action=view¤t=hrw7_22-38.gif

2007-09-07 18:15:28 · 4 answers · asked by Anonymous in Physics

2007-09-07 18:01:24 · 7 answers · asked by if i only had a brain 1 in Zoology

2007-09-07 18:00:07 · 11 answers · asked by donielle 7 in Medicine

what's the difference between global warming and the greenhouse effect?
they all seem the same!
thanks.

2007-09-07 17:51:23 · 3 answers · asked by =] 1 in Earth Sciences & Geology

when i think about the universe i dont think limits everything people have done was beyond the limits people can manipulate alot of things to get a better result then what is narutal so when einstein says nothing can go faster then light i say nothing that we have right now can go fast. once we have a dicens sphear then things will go alot fast population will explode space travel will happen daily and mankind will inhabit multiple galaxys. with a bigger population there will be a better chance of inventions furthering space exploration. this is a great vision but not one that i expect to see in my life time. any one have a different vision of the future?

2007-09-07 17:49:38 · 4 answers · asked by Anonymous in Astronomy & Space

A charge of −4.13 μC is located at the
origin, and a charge of −7.06 μC is located
along the y axis at 1.90962 m.
At what point along the y-axis is the electric
field zero?
Answer in units of m.

2007-09-07 17:36:11 · 3 answers · asked by yahoo answers 1 in Physics

hey, for an assignment i've been told for me and my group to construct a bridge out of popsicle sticks and a white wood glue. it has to be over 15 in. and less than 18 in. long. and a like 3-5 in wide. From what i understand there has to be a roadbed with a gap wide enough to accomidate the thing the load will be hung with. Any advice will be greatly appreciated.

2007-09-07 17:35:14 · 11 answers · asked by just_jinkey 2 in Physics

2007-09-07 17:35:08 · 7 answers · asked by rasheed 1 in Astronomy & Space

2007-09-07 17:31:27 · 11 answers · asked by lala haha gaga mama 2 in Mathematics

2007-09-07 17:26:39 · 12 answers · asked by Anonymous in Zoology

Does anyone what an atom bomb consists of, like a url or a list of materials.I am supposed to make one for a school project....as in like a mini-model of one
I only know one of the major components is uranium.
and also what are some processes/reactions involved?
thanks!

2007-09-07 17:25:33 · 5 answers · asked by Shaun_7_C 2 in Physics

Spontaneous generation is impossible in a macroscopic environment because of the 2nd law of thermodynamics. Fluctuation theorom, however, states that entropy can be decreased in a microscopic environment. Does that prove spontaneous generation (RNA world) are possible?

2007-09-07 17:24:27 · 1 answers · asked by blakerboy777 3 in Physics

2007-09-07 17:22:33 · 9 answers · asked by Seanah C 1 in Other - Science

I. You ran two chromatography tests, using the same dye
a. In the first experiment you used a strip of paper ten cm long, and the second 20 cm. Will the Rf value be the same or not?
b. In the first experiment you used water as a solvent, and the second ethyl alcohol as a solvent, will they be the same or different?

II. You ran two chromatography tests, with different dye
a. with the same size strip of paper, and solvent. Same or different?


I would appreciate help, and I would appreciate thorough answers more. Thank you very much.

2007-09-07 17:19:17 · 2 answers · asked by vince_oy 3 in Chemistry

2007-09-07 17:16:14 · 1 answers · asked by khosyieaz 1 in Chemistry

2007-09-07 17:07:24 · 4 answers · asked by marcusmo78 1 in Earth Sciences & Geology

Protein secreting cells
Steroid secreting cells
cells that produce oxygen and carbs when exposed to light
cells that absorb digested nutrients or transport waste products?

2007-09-07 16:59:47 · 2 answers · asked by Anonymous in Biology

exactly two hours at which time they were 208 miles apart. If one traveled on average 8mph faster than the other car. What was the average speed for each car, for the two hour trip?

What formula do you use? A full explanation would be helpful. Thank you!

2007-09-07 16:58:26 · 10 answers · asked by c_eva02 2 in Mathematics

Write the equation of the line with x-intercept (–9, 0) and undefined slope.

A) y = –9
B) x = –9
C) y = –9x
D) x = 0

2007-09-07 16:55:41 · 6 answers · asked by ray 1 in Mathematics

mk i have this problem

6y^2(2y^0)^2

i know it has to equal 24y^2

but how explain all the way please!

Thank you!

2007-09-07 16:55:31 · 7 answers · asked by Mae-Day 3 in Mathematics

does anyone know the answer to this question?

x squared - y squared = 10

the answer is either a. a circle b. an ellipse c. a hyperbola or d. a parabola

2007-09-07 16:55:24 · 6 answers · asked by bigblue9491 2 in Mathematics

Time (s) = 16.52 s
Length (cm) = 100 cm

This is for when a spring of 100 cm is sent to one end and than back. Each trip takes 16.52 seconds.

2007-09-07 16:51:29 · 3 answers · asked by To-the-Stars 4 in Physics

The National Park Service is responsible for conserving wildlife and historic objects.

True
False

Swamps are usually associated with the presence of

grasses
trees
salt
moss



What is the importance of salt marshes? Support your answer with several reasons for their importance

2007-09-07 16:47:49 · 1 answers · asked by MiSs MoM 2 in Earth Sciences & Geology

Suppose 1.20g of c2h2 is mixed with 3.50g of o2 in a closed, steel container, and the mixture is ignited. What substances will be foundd in the mixture left when the burning is complete? I have no clue how to approach this...

2007-09-07 16:47:40 · 2 answers · asked by kleo 4 in Chemistry

1.a line of plane contains the points(-3,2)and (4,1)
a.find the slope of the line
b.find an equation for the line
c.find an equation of a line that contains(7,5)and it is parallel to the line above
d.find an equation of a line that contains(7,5)and is perpendicular to the line above
e.find the coordinates of the midpoint and the lengt of the segment determined by(-3,2)and (4,1)

2.find zeros of each function below.graph the functions
a. 3(x-2)=y
b. 4x + 6y=18
c. y=2x(SQUARED)- 2
D. Y=-3X(SQUARED) + 12
THANK YOU!!!!!

2007-09-07 16:46:48 · 7 answers · asked by witch_dea 2 in Mathematics

3x-y>6

x+y<6

2007-09-07 16:46:02 · 3 answers · asked by lele 2 in Mathematics

solve: x^3/2=125
Must show work.

2007-09-07 16:43:36 · 7 answers · asked by darrington2001 1 in Mathematics