Science & Mathematics - 25 November 2007

2007-11-25 12:14:09 · 10 answers · asked by Mr. Main Event 5 in Medicine

2007-11-25 12:11:17 · 1 answers · asked by Breanna R 1 in Earth Sciences & Geology

2007-11-25 12:10:52 · 2 answers · asked by Kay 2 in Mathematics

A box weighing 100 newtons is pushed up an inclined plane that is 5 meters long. It takes a force of 75 newtons to push it to the top, which has a height of 3 meters.

How do i find the Percent Efficiency in this problem?? PLEASE HELP!!

2007-11-25 12:09:10 · 2 answers · asked by Anonymous in Physics

2007-11-25 11:59:30 · 1 answers · asked by Breanna R 1 in Chemistry

2007-11-25 11:59:21 · 2 answers · asked by Anonymous in Physics

how would you do this if the atomic mass of silver is 108?

thnaks

2007-11-25 11:58:59 · 1 answers · asked by snoboarder2k6 3 in Chemistry

Well this kid in my class loves to debate and goes agaist everything and he asked "if the earth is round why dosent all the water just fall and everything" and i couldent answer it but why

2007-11-25 11:55:23 · 10 answers · asked by battla4life p 1 in Astronomy & Space

organ system, tissue, organ, organism, cell

2007-11-25 11:53:56 · 12 answers · asked by danielle 2 in Biology

2007-11-25 11:49:12 · 15 answers · asked by john wondering 7 in Biology

Octane reacts with oxygen to produce carbon dioxide and oxygen

2007-11-25 11:48:31 · 4 answers · asked by WAKA 1 in Chemistry

find 3 consecutive integer twice the greatest integer is 2 less than 3 times.

2007-11-25 11:48:29 · 21 answers · asked by Mathⁿ 4 in Mathematics

I have to match graphs with fuctions such as f(x)=x^2-1.
I was wondering if there was a site that would give me different functions and what their corresponding behaviors look like.

2007-11-25 11:45:49 · 1 answers · asked by Anonymous in Mathematics

evaluate the expression

1. arcsin(sin(tan(arccos 5/13)))

2. cos(arctan 17/12)

word problem:
When an airplane leaves the runway, its angle of climb is 18 degrees and its speed is 275 feet per second. Find the plane's altitude after 1 minute.

2007-11-25 11:44:56 · 1 answers · asked by Anonymous in Mathematics

And why is she a whole lot smarter at some things than I am? Does that have to do with the fact that we were born five minutes apart?

2007-11-25 11:44:02 · 4 answers · asked by Chichiri 1 in Biology

If a fly is in a closed window, why does it die? Thanks.

2007-11-25 11:39:02 · 5 answers · asked by - 2 in Biology

in the cloud as you can have spots of rain from wispy clouds,while massive thunderclouds can hold onto their moisture content until eventually releasing it as a massive deluge,so what's the trigger that determines when that happens?

2007-11-25 11:35:28 · 6 answers · asked by Anonymous in Weather

XD
i have quite a few questions i want to ask and check over with like little things like states and stuff xd if anyones not that busy have a look!

1)Ca(s)+ 2H2O(L)>Ca(OH)2 (aq)+H2(g)
Nh4cl (s)+ h2o> NH4cl(aq)? have no idea on that

2)to find molar ethaply for calcium of water
i do n= mass/molar mass to get moles for ca
do q=mc T to get heat for water
then molar ethaply is q/ moles of ca
i have all the values but those are the right steps?

it will be same for NH4CL(ammonium chloride)

3) and dissoultion of ammonium chloride with water is endothermic becasue heat was absorbed since the final temperature went down

4)if more calcium was added to the calcium with water reaction.. what will happen to molar entaply? it will go down since the entaply is going to be divided by a higher number right

5) this question was asking for heat or enthaply change of both equations.. i think (heat and enthaply change is the same thing right)

to get q its just mc delta T right

6) i have no idea how to write thermal equations for both of em so help here will be nice xd

7)calcium with water is exothermic becasue heat was produced on the products side(temperature increased) ammonium chloride with water is endo cuz heat was absorted final temperature lowered
but i think this question was worth 6 marks.. i dont know how i can do a 6 mark answer

2007-11-25 11:33:23 · 2 answers · asked by Bob W 1 in Chemistry

I need to know whether they like fend for themselves or try to find other crickets, something like that. But I can't find anything.

2007-11-25 11:32:16 · 1 answers · asked by rky024 3 in Zoology

How many moles of C atoms are in 1 mol of Sucrose (C12H22O11)?

How many C atoms are in are in 1 mol of Sucrose?


The word "atom" and throws me off. Is there anyone that can exlain?

Thanks Guys!

2007-11-25 11:32:03 · 2 answers · asked by Anonymous in Chemistry

2007-11-25 11:29:51 · 2 answers · asked by Anonymous in Astronomy & Space

2007-11-25 11:25:07 · 2 answers · asked by Anonymous in Chemistry

The radius of curvature of a loop-to-loop roller coaster is 12 m. At the top of the loop, the force that the seat exerts on a passenger of mass m is 0.4mg. Find the speed of the roller coaster at the top of the loop. Answer: v = 12.83 m/s.

Please provide step by step instructions on how you solve this.

2007-11-25 11:23:00 · 1 answers · asked by ? 2 in Physics

Any help would be much appreciated.

2007-11-25 11:22:54 · 6 answers · asked by Anonymous in Astronomy & Space

What is the density of air??
(i need a number)

thanks!<3

2007-11-25 11:19:42 · 1 answers · asked by Anonymous in Chemistry

2007-11-25 11:19:03 · 5 answers · asked by Anonymous in Astronomy & Space

(148/145 +51/145 i)

2007-11-25 11:17:32 · 2 answers · asked by evosteo 2 in Mathematics

what led to the rwanda genocide in 1994.??

2007-11-25 11:16:49 · 3 answers · asked by Anonymous in Geography

There are various ways in which a person could "travel into the future" in a limited sense: the person could set things up so that in a small amount of their own subjective time, a large amount of subjective time has passed for other people on Earth. For example, an observer might take a trip away from the Earth and back at relativistic velocities, with the trip only lasting a few years according to the observer's own clocks, and return to find that thousands of years had passed on Earth. It should be noted, though, that according to relativity there is no objective answer to the question of how much time "really" passed during the trip; it would be equally valid to say that the trip had lasted only a few years or that the trip had lasted thousands of years, depending on your choice of reference frame.

2007-11-25 11:15:35 · 8 answers · asked by Anonymous in Physics

the specific heat capacity of copper is 0.385 J/g * k waht quantity of heat is required to heat 168g of copper from -12.2 degreers celcius to +25.6 degreees celcisu
thank you
the answer is 2.44 kJ
i just dont know how to do the problem

2007-11-25 11:13:09 · 1 answers · asked by Anonymous in Chemistry