Science & Mathematics - 20 October 2007

For example: (999 / 9) - 9 = 102 (but you must get 100, not 102!!!)

2007-10-20 16:18:05 · 4 answers · asked by JhoodFlowz 1 in Mathematics

I have always wanted to know the answer to this question, perhaps some of you engineers or builders out there can answer it. When building a very large or tall building, cranes are often perched on top. How do they get the crane up there and how do they move it to the top of each level as it gets higher. More importantly, how do they get the crane down once the building has finished? It can't be from another crane as none would be that tall....

2007-10-20 16:13:55 · 3 answers · asked by fijibabie 5 in Engineering

then how large must n be to be certain that Pn(0.2) approximates e^0.2 accurate to 6 decimal places.
Thanks
Dave

2007-10-20 16:06:34 · 1 answers · asked by Anonymous in Mathematics

sq. rt. (8+6i)(6i-8)

2007-10-20 16:01:13 · 6 answers · asked by amy f 1 in Mathematics

2007-10-20 15:59:58 · 5 answers · asked by sdjfhdkjsfgkuae 2 in Biology

Can someone please tell me what is the full form of FACS or FACs in medicine?

2007-10-20 15:55:27 · 4 answers · asked by Anonymous in Medicine

2007-10-20 15:49:36 · 3 answers · asked by Anonymous in Mathematics

Using the graph of y=x^2+4x-5,
1)what are the solutions to the equations x^2+4x-5=0?
and 2)equation of line of symmetry for this?

2007-10-20 15:49:05 · 2 answers · asked by Moe 1 in Mathematics

I dont need any decimal point, just the whole number.

2007-10-20 15:43:53 · 4 answers · asked by Shamillionaire 2 in Geography

I know they are there, they always lead me to a channel when something goods on.
but I would like to talk to them directly and not assume so much

2007-10-20 15:42:20 · 26 answers · asked by Anonymous in Paranormal Phenomena

Why don't they make it so that I has two horizontal lines one on top and the other on bottom?

2007-10-20 15:40:01 · 3 answers · asked by Anonymous in Physics

2007-10-20 15:37:31 · 8 answers · asked by Jade 3 in Physics

Has anyone considered that there may be a second axis the Earth rotates on explaining Ice Ages, and the melting of the Glaciers, we have only been observing Earth for a short period of time, considering it's age.

2007-10-20 15:35:48 · 10 answers · asked by Richard B 1 in Earth Sciences & Geology

Other than quartz
I CAN NOT FIND ANYTHING ON CONGLOMERATES

2007-10-20 15:34:42 · 8 answers · asked by Wonders 1 in Earth Sciences & Geology

Lightning an unlimited source of energy!!! Are we missing out on something?

2007-10-20 15:32:49 · 3 answers · asked by well dressed 1 in Physics

The shape of the surface of water in a bucket is determined by the condition that the potential energy per unit mass, as determined in the frame in which the water is at rest, is constant at all places on the surface. Assume that the bucket is into rotation at an angular speed w about its vertical central axis and that the water rotates with the bucket. Write a formula that gives the shape of the water surface. (Hint provided by the book: Note that the normal force of the liquid must account for the centripetal acceleration).

2007-10-20 15:26:25 · 4 answers · asked by Anonymous in Physics

i have to solve this and in the answers it says x=0 x=-4
how???

2007-10-20 15:23:19 · 8 answers · asked by Anonymous in Mathematics

I think my mom and I are physic... could this be true? My dad has had 2 frinds who have died of mtorcycle accidents... one happened right in front of him. Both times I have had depression, feeling of death, and horrible stomache aches, without any knowledge of the accidents. the second time when it happened infront of my dad I felt those feelings at the exact moment it happened (about 1pm)... the strange thing is I couldn't have known about it.. I was in Boston! (it happened in Cali), both people who died I had no connection too, I never met either of them. My parents and I visited a Ghost town called Calico and went on a tour at ngiht in a graveyard... I also felt feelings of death, sickness, and it smelled very badly... my mom and I were at the very back of the group near some graves (unmarked) and no breeze, and nothing was behind me (I looked) but their was a gentle pushing as if someone was trying to push me forward to listen to the guide. I had a thick jacket on... continued...

2007-10-20 15:18:54 · 14 answers · asked by Anonymous in Paranormal Phenomena

2007-10-20 15:17:48 · 7 answers · asked by yanksrule4691 1 in Mathematics

How do you find the length of the side of the square, when the square is inscribed in a right triangle. solve in terms of a, x and b . a and b are sides of the right triangle. x is the length of the side.

(it'd be better if i could draw a picture but i cant. :/)

2007-10-20 15:17:28 · 7 answers · asked by Anonymous in Mathematics

a over 3 + 2a over 5. Do I cross multiply? Please help me.

Thank you.

2007-10-20 15:14:49 · 6 answers · asked by Kevin G 2 in Mathematics

atoms present in the substance.is this method more useful for organic substances or inorganic substances?

2007-10-20 15:12:57 · 2 answers · asked by lisandra 1 in Chemistry

Can someone please help me with this problem. Thank you.

2007-10-20 15:12:05 · 8 answers · asked by Kevin G 2 in Mathematics

would show the best survival following exposure to UV radiation? explain

2007-10-20 15:07:02 · 1 answers · asked by 41 1 in Biology

which has greater density 5 kg of lead or 10 kg of aluminum

2007-10-20 15:05:52 · 4 answers · asked by Anonymous in Physics

A 0.148 kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.900 m/s. It has a head-on collision with a 0.291 kg glider that is moving to the left with a speed of 2.16 m/s. Suppose the collision is elastic.

Find the magnitude of the final velocity of the 0.148 kg glider.

Find the direction of the final velocity of the 0.148kg glider. Left or right?

Find the magnitude of the final velocity of the 0.291 kg glider.

Find the direction of the final velocity of the 0.291kg glider. Left or right?

Thanks for your help!

2007-10-20 15:00:24 · 1 answers · asked by Frostie K 1 in Physics

state answer as an ordered pair (x,y)

1. x+y=1
y=(2/3)x-4

2. Is this ordered pair (5.3, 1.2) a solution to the system?
x+2y=1
x-3y>=0
yes or no?

3. Fill in the blank with correct word
In systems of equations, solving one equation for a variable and plugging that expression into another equation is known as the what method?

4. Solve the following system of equations. WHat is the value of a?
3a-5b=10
a+7b=12
a)a=5
b)a=79/13
c)a=1
d) none of these

5.) Solve the following systems of equations. Describe the graph without graphing.
3x-2y=24
6x-4y=-6
a)two intersecting lines-solution in quadrant 1
b)two intersecting lines-solution in quadrant 3
c)two parallel lines-no solution
d)coincidental lines-many solutions

6. Describe the graph without graphing.
a+b=10
3a+2b=40
a)two intersecting lines-solution in quadrant 2
b)two intersecting lines-solution in quadrant 4
c)two parallel lines-no solution
d)coincidental lines-many solutions

2007-10-20 14:59:08 · 3 answers · asked by Anonymous in Mathematics

2007-10-20 14:57:41 · 16 answers · asked by Divesh S 2 in Geography

2007-10-20 14:56:28 · 5 answers · asked by Omair C 1 in Mathematics

2007-10-20 14:54:17 · 6 answers · asked by Divesh S 2 in Geography