Science & Mathematics - 12 December 2007

A 0.23 kg puck is initially stationary on an ice surface with negligible friction. At time t = 0, a horizontal force begins to move the puck. The force is given by = (14.9 - 2.79t2) , with in newtons and t in seconds, and it acts until its magnitude is zero. (a) What is the magnitude of the impulse on the puck from the force between t = 0.534 s and t = 1.76 s? (b) What is the change in momentum of the puck between t = 0 and the instant at which F = 0?

2007-12-12 11:01:12 · 1 answers · asked by shade o 1 in Physics

my best friend has a special camera that is set to take pictures of ghosts if their around in that picture. Well my best friend took a picture of her with that camera and behind her was her dad's ghost she was not lying. Another is: i was reading a book on Haunted Houses and there was a picture of Abraham Lincoln's wife ( this picture was taken after Lincoln's death) and behind the picture of Mrs.Lincoln was Abraham Lincoln's face and his entire body. I exmained it closely and it was definitley Abraham Lincoln.

2007-12-12 11:00:15 · 18 answers · asked by Anonymous in Paranormal Phenomena

I'm taking Geometry, and I probably learned this in Algebra, but I forget how to solve a two-variable equation!
Such as:
5x-1=3y
or
2y+1=2x+3
Please explain, don't just do the problem, because I have many more problems to do on my own!

2007-12-12 10:59:20 · 6 answers · asked by Anonymous in Mathematics

2007-12-12 10:58:31 · 3 answers · asked by anand a 1 in Mathematics

these were my problems that i finished

find three consecutive positive integers such that the square of the third is 51 more than the sum of the first and second

i got -X=25 but i dont see how thats right because X has to be positive but the number in this problem has to be positive too. if you do tell me the answer please show me the work and the check.

write an equation of the line whose slope is -2 and whose y intercept is -1

i got y= -2X+-1

thank you.

2007-12-12 10:57:50 · 2 answers · asked by Anonymous in Mathematics

How do I figure out how much CO2 and CO my water heater is producing. I want to figure out the environmental impact of a gas burning water heater.

I'm trying to put an example together that shows if 100 water heaters were changed out for tankless on demand water heaters that would be same as removing X number of cars from the road. Hope that makes sense.

2007-12-12 10:57:17 · 3 answers · asked by Bobby J 2 in Engineering

My freinds think loch ness monsters are fake. what do you think

2007-12-12 10:44:49 · 6 answers · asked by Anonymous in Zoology

The final exam worth 60% of my final grade, that is. The passing grade is 60%.

2007-12-12 10:43:49 · 3 answers · asked by Melissa 2 in Mathematics

2007-12-12 10:42:34 · 10 answers · asked by Anonymous in Mathematics

2007-12-12 10:39:46 · 4 answers · asked by JJ 2 in Weather

Can someone find a website that will show the percent of genetic similarites between humans and other organisms?

Namely other primates?

2007-12-12 10:37:13 · 2 answers · asked by Matt 4 in Biology

Why do some people like feeding the gullible lies? Does it pay to say random things about UFO's, ancient Indian Vamanas, and stupid things that have no scientific backing, evidence, or solid proof? If their is actually solid proof someone let me know....

2007-12-12 10:35:52 · 12 answers · asked by Be My Angel :] 4 in Paranormal Phenomena

2007-12-12 10:34:52 · 10 answers · asked by Anonymous in Mathematics

2007-12-12 10:34:00 · 1 answers · asked by Anonymous in Earth Sciences & Geology

A loaded Boeing 747 jumbo jet has a mass of 2.0 105 kg. What net force is required to give the plane an acceleration of 2.8 m/s2 down the runway for takeoffs?

2007-12-12 10:31:57 · 1 answers · asked by Anonymous in Physics

If so what is it in decimal form?? Thank you!!!

2007-12-12 10:30:30 · 6 answers · asked by Anonymous in Mathematics

We have a map assignment in Geography and that is the only one I cant find

2007-12-12 10:28:03 · 4 answers · asked by Morgan 3 in Geography

Find the exact value of s in the given interval that has the given circular function value.

[pi, 3pi/2] ; tan s = 1

2007-12-12 10:27:27 · 1 answers · asked by Anonymous in Mathematics

2007-12-12 10:26:57 · 8 answers · asked by Anonymous in Mathematics

2007-12-12 10:26:00 · 11 answers · asked by animallover 2 in Paranormal Phenomena

2007-12-12 10:25:13 · 9 answers · asked by animallover 2 in Paranormal Phenomena

there are nine side dishes. mary wants three different sides. how many combinations can she make? how do you solve this is it "9!"?

also...mary wants 2 out of 9 sides and 1 out of 3 main dishes. how many combinations are possible?

2007-12-12 10:25:04 · 8 answers · asked by xpopxprincessx9x 2 in Mathematics

and my fish froze up do u think i can do anything to save it

2007-12-12 10:23:37 · 5 answers · asked by Anonymous in Weather

2007-12-12 10:21:16 · 2 answers · asked by Chris 2 in Biology

a) 4(2x-3)
b)3a x 5a
C)5(3x+2)-5(2x-3)

2007-12-12 10:11:11 · 4 answers · asked by cheese freak 1 in Mathematics

a) has mass and a definite shape
b)combines with other matter and has mass
c) has mass and occupies space
d) combines with other matter and space space

2007-12-12 10:10:52 · 2 answers · asked by Anonymous in Physics

2007-12-12 10:09:17 · 7 answers · asked by megg (: 1 in Astronomy & Space

OK this is a problem on my homework i dont really get it. Oh yea and this is is 6th grade math yea....
Problem:
5.25-2 3/8

its a mixed number 2 as the whole number
And i have to borrow
I know this is my home work but i dont understand and i have my trumpet concert coming up soon. Please tell me step by step on how you do it thanks

2007-12-12 10:08:51 · 5 answers · asked by Anonymous in Mathematics

Sexual dimorphism is the difference in size or appearance between a male and female of that species.

2007-12-12 10:08:36 · 2 answers · asked by Anonymous in Biology

how are reflecting and refracting telescopes similar ?

2007-12-12 10:07:39 · 5 answers · asked by Anonymous in Astronomy & Space