Science & Mathematics - 10 October 2007

2007-10-10 13:05:43 · 4 answers · asked by thebrainwaver 2 in Other - Science

Solve the quadratic equation by completing the square: x^2 + 24 = - 10x

2007-10-10 13:04:56 · 9 answers · asked by sara 1 in Mathematics

Consider the 662N weight held by 2 cables... The left hand cable had tension T and makes an angle θ with the wall. The right hand cable had tension 860N and makes and angle of 32 degrees w/ the ceiling.

- What is the tension T in the left hand cable slanted at an angle θ w/ respect to the wall?


- What is the angle θ wich the left hand cable makes w/ respect to the wall?


**I understand the problem if the angles were given - but how could you find the tension w/o the angle???

2007-10-10 13:00:29 · 2 answers · asked by Anonymous in Physics

I'm not sure how to go about answering this. Any help would be appreciated.

A ball is projected horizontally from the edge of a table that is 1.00m high, and it strikes the floor at a point 1.20m from the base of the table.
a.) What is the initial speed of the ball?
b.) How high is the ball above the floor when its velocity vector makes a 45.0 degree angle with the horizontal?

2007-10-10 12:58:57 · 2 answers · asked by neverisenough 1 in Physics

A truck, carrying a sheet of plywood, accelerates at 1.8 m/s2. When the truck's speed reaches 20 m/s, the sheet of plywood falls off the back of the truck. The truck continues to accelerate forward at 1.8 m/s2, but the plywood slides on the road with an acceleration of -0.85 m/s2. What is the distance between the truck and the piece of plywood 5.0 seconds after the plywood falls off the truck?

2007-10-10 12:53:06 · 1 answers · asked by alkesh831 2 in Physics

2007-10-10 12:52:45 · 9 answers · asked by browncow 1 in Weather

http://tinypic.com/view.php?pic=opz6zq&s=2
Which of the following statement are true for the above Lewis structures ?

a) There are atoms in both of these structures with non-zero formal charges

b) The structures represent different compounds

c) The number of atoms S is bonded to is 4 in each structure

d) The number of atoms S is bonded to plus the number of lone pair electrons it has is equal to 4 in each structure


enter all tru statments

2007-10-10 12:51:47 · 4 answers · asked by physicsisgay 2 in Chemistry

Gandalf the Grey started in the Forest of Mirkwood at a point with coordinates (2, 1) and arrived in the Iron Hills at the point with coordinates (4, 5). If he began walking in the direction of the vector v=3i+2j and changes direction only once, when he turns at a right angle, what are the coordinates of the point where he makes the turn.

I can do this by using equation of lines.. but I have no idea how to do this with vectors.

2007-10-10 12:50:46 · 1 answers · asked by Zajebe 2 in Physics

a mole of sodium has a mass of 23.0g
how many atoms are present in a 156g sample

so i said 156/23=6.78
6.78(6.02*10exp23)=4 081 560 atoms

i ASKED IT BEFOR THEN SOMEONE ANSWERED
"The considerations are impecable, there seems to be an error in the multiplication though. Yes, the result is 4.08 x10exp24, so there are 18 zeros missing to the right of the number you wrote."

am i right or does that guy have point

2007-10-10 12:49:33 · 2 answers · asked by Josh j 1 in Chemistry

2007-10-10 12:49:02 · 3 answers · asked by Curt C 1 in Weather

If I could get any help with any of these questions, it would be much appreciated. These deal with projectiles and vertical/horizontal displacement.

1) The peregrin falcon flies at speed of 200 mph. Assume it moves horizontally at this speed 100 m above the ground when it brings its wings into its sides and freefalls. How far will the bird fall vertically while traveling horizontally a distance of 100 m? (Answer: 6.13 m just need work, please)

2) A puma jumps to a height of 12 feet when leaving the ground at an angle of 45 degrees. With what speed must it leave the ground to reach this height? (Answer: 12 m/s work or rational behind it needed)

Again, any help would greatly be appreciated! Thanks in advance.

2007-10-10 12:48:12 · 1 answers · asked by yankeesrus07 2 in Physics

i dunno

2007-10-10 12:47:53 · 5 answers · asked by Curt C 1 in Weather

A rock fell off a cliff and then a second rock fell 3.6s later and the initial velocity is 70.56m/s and the acceleration is 9.8m/s^2. I had to find the time that the rock fell to the ground and I got 5.2s but I think the time is wrong. Then to find the height of the cliff I used a distance formula and got 499m but that answer is wrong if anyone knows what I did wrong that would be very helpful.

2007-10-10 12:46:45 · 3 answers · asked by glance 3 in Engineering

white blood cells

2007-10-10 12:45:29 · 23 answers · asked by sharryonfire 1 in Biology

I need to find jobs that pay commission and they gave me this info:

Base pay: 24,000-36,000 per year
Commission: 15, 000

my teacher wants me to find what percent of 24,000 is 15,000
please someone help me to do this!!

2007-10-10 12:40:46 · 9 answers · asked by Anonymous in Mathematics

7 1/2 of the falcons' pkay were running plays. 35% of their play were passingplays. They also haad four plays when they punted. how many total plays did the falcons have during the game?

2007-10-10 12:40:29 · 1 answers · asked by Anonymous in Mathematics

im rele stuck on this question if any of u smart ppls could help that be great!
the question is continue each pattern for 3 more terms. CLEARLY DIRCRIBE how to find successive terms
a) 486, 162, 54, 18
b) 3, 7, 15, 31
c) 2/3, 7/12, 1/2, 5/12

any1 know!?!

2007-10-10 12:40:19 · 1 answers · asked by Penny ♥ 2 in Mathematics

What do two stars 1.5 seconds of arc apart look like through this telescope?

2007-10-10 12:40:03 · 3 answers · asked by jawaiian103 1 in Astronomy & Space

for the life of me i cannot get this problem. Even if someone just gives me the formula i can work from there.

2007-10-10 12:33:55 · 5 answers · asked by sandee 2 in Mathematics

300 millions years ago ,the continents were joined together. Now they are separated and Alfred Wegener proved that they were joined.

The scinentist disagreed y is that?

2007-10-10 12:31:11 · 6 answers · asked by babygirl 1 in Earth Sciences & Geology

I need help quick!

Divide: The Eight is the exponent

15y8 over 3

2007-10-10 12:27:24 · 2 answers · asked by KitKatbar 2 in Mathematics

its for some extra credit, they'll be a few more after this! :D

2007-10-10 12:26:52 · 3 answers · asked by rawrAshleyxx 1 in Chemistry

___5___
√[3] + √[5]

2007-10-10 12:24:47 · 1 answers · asked by Ivyâ?¥ Left Myspace 1 in Mathematics

I just finished watching a NOVA program titled E=MC2, the narrator stated that Einstein had discovered that mass and enegy is the same thing, in different forms. If this is entirely accurate, how do you account for gravity, energy has no gravity, to my knowledge, if it did, the incredible gravity of the singularity would have prevented its expasion. He also stated that the sun loses four million tons of mass each and every second, I know that this is incorrect, that may be the amount of mass that is used to convert hydogen into helium, every second, but only a small portion of this mass is lost in the process of fusion and converted into radiation. Is there something missing in the first statement?

2007-10-10 12:23:00 · 1 answers · asked by johnandeileen2000 7 in Physics

I am looking for sites for monitoring earthquakes volcanoes etc. and geology sites for studying. thanks in advanced

2007-10-10 12:19:54 · 1 answers · asked by obsidiangrl 2 in Earth Sciences & Geology

Fake Coin
Imagine that you have in front of you fifty coins. They all look exactly alike except one of them is a fake. Because it's a fake, it weighs a couple of grams more than a real coin. So, if you had a balance scale, and you knew which one was the bogus coin, you would put it on one side of the scale, and a good coin on the other side. It would be immediately obvious from this imbalance which one was the phony coin, because it's heavier than a real coin. Knowing that, you have in front of you fifty coins -- one of which is bogus and a balance scale. The question is: how can you determine which one is the fake in four attempts?

2007-10-10 12:19:39 · 1 answers · asked by tuazeee 2 in Physics

What is the Symbol, Atomic Number, Atomic Mass, Number of Protons and Number of neutons and electons, melting point and boiling point and normal phrase of the element aluminum.
I think I have some of the answers, I just want to check, If you don't truly want to help me dont answer.

2007-10-10 12:17:32 · 4 answers · asked by Anonymous in Chemistry

Ammonia nitrate+sodium hydroxide produces ammonia hydroxide and sodium nitrate

am i correct? also if im wrong can you plz correct me

2007-10-10 12:16:29 · 1 answers · asked by Anonymous in Chemistry

how do you describe level surfaces for f(x,y, z) = x^2 - y^2

2007-10-10 12:15:27 · 1 answers · asked by Anonymous in Mathematics

Twelve 5-liter cans, filled with syrup, weigh a total of 492 units. Each can, when empty, weigh 3 units. What is the weight of 1 liter of syrup alone (without a can)?
Explain.

2007-10-10 12:13:18 · 1 answers · asked by Anonymous in Mathematics