Science & Mathematics - 25 October 2007

answer is -99. the square root of -121 is -11 therefore 11*9 -99. I am so confused. Please tell me if I have this correct?

2007-10-25 08:38:44 · 3 answers · asked by chas_lynn2002 2 in Mathematics

This rock is formed naturally. It looks like a cylinder-shape. When you spin it it will slow down and spin in the opposite direction all by itself!

2007-10-25 08:38:16 · 3 answers · asked by ito 2 in Earth Sciences & Geology

2007-10-25 08:36:23 · 8 answers · asked by itai d 1 in Medicine

A model rocket is fired vertically upward from rest. Its acceleration for the first three seconds is a(t) = 60t at which time the fuel is exhausted and it becomes a freely "falling" body. Fourteen seconds later, the rocket's parachute opens, and the (downward) velocity slows linearly to -18 ft/s in 5 s. The rocket then "floats" to the ground at that rate.

(a) At what time does the rocket reach its maximum height? (Give your answer correct to one decimal place.)
11.4 seconds.

(b) What is that height? (Give your answer correct to the nearest whole number.)
1409 ft.

(c) At what time does the rocket land? (Give your answer correct to one decimal place.)
I cannot find this for my life, if someone could show me the steps and the answer, it would be really appreciated. Oh, and the other two answers a and b have been verified correct.

2007-10-25 08:34:29 · 2 answers · asked by Ant 3 in Physics

like a map of the entirety of north america, with a key that shows what the elevations are.

also, does anyone know where i could find a relief map of coastal ares, if possible, as accurate as 10 feet? not required but would help tons.

this is for a project about why global warming doesn't mean god is going to flood the entire world lol. maybe after i point out that the sea level is going to increase by 10 feet at the highest highest highest estimate. thanks for helping me make these people see reason
^_^ \ , , /

2007-10-25 08:28:09 · 3 answers · asked by Fundamenta- list Militant Atheist 5 in Earth Sciences & Geology

2007-10-25 08:25:46 · 1 answers · asked by Anonymous in Botany

x+3/2=29-2x
and
3x+1/4=5-2x/6

I have been trying for almost an hour now and I am really stuck!!

2007-10-25 08:23:38 · 6 answers · asked by Jenniefrizzzle 4 in Mathematics

2007-10-25 08:21:05 · 1 answers · asked by hello 1 in Physics

Book problems that im trying to figure out to do better on the test


1. Particle A is located at the origin, particle B at the point (x, y) = (25 cm, 0). What is the location of the center of mass?
xcm
ycm

2. If a particle of mass 4.8 kg is moving east at 10 m/s and a particle of mass 16 kg is moving west at 10 m/s, what is the velocity of the center of mass of the pair?

3. Two identical gliders on an air track are held together by a piece of string, compressing a spring between the gliders. While they are moving to the right at a common speed of 0.52 m/s, someone holds a match under the string and burns it, letting the spring force the gliders apart. One glider is then observed to be moving to the right at 1.30 m/s.
What velocity does the other glider have?
___ m/s to the left.

2007-10-25 08:16:54 · 2 answers · asked by Pr0ject 1 in Physics

Do you think i am doing the right thing to prepare for college?

I am in 10th grade taking Honors Biology and Environmental Science.

Last year i took Earth And Space I last year.

In 11th grade i plan to take Earth And Space II and Honors Chem. And also i was thinking about taking Algebra II over the summer, so i can take Calculus in 12th grade. Oh and i'm going to take Honors Physics and maybe another science course or prob stats in 12th grade too.

Does anyone have anything that i should take in order to be more ready for college?

2007-10-25 08:16:45 · 5 answers · asked by ♥ Pompey and The Red Devils! 5 in Weather

2007-10-25 08:12:31 · 9 answers · asked by clcsexyma1 1 in Mathematics

Please help, need answer for shcool. The question isn't what is a fossil fuel, but what kinds are there. I just want to know what a fossil fuel is.

2007-10-25 08:12:24 · 2 answers · asked by Lejua 2 in Earth Sciences & Geology

2007-10-25 08:11:14 · 2 answers · asked by Jaclyn 1 in Biology

Is there any mathematical formula for calculating the sum of consecutive numbers? Like the sum os 1 to 2 is=3, the sum of 1 to 6 is=21,and the sum of 1 to 500 is= 125250. But, is there any formula to calculate and find these results instantly?

2007-10-25 08:04:12 · 7 answers · asked by roobal r 1 in Mathematics

Can someone please help me solve the problem : -3[-2 the the 0 power-4)-(-2)(-3)]-[(-6 to the 0 power-2)-2 to the second power (-3)]
I know the answer is 24 but I don't know how to solve ,so PLEASE help!!!

2007-10-25 08:04:00 · 2 answers · asked by gaylegirl18 1 in Mathematics

I need some help with these two: I pick best answer as soon as it's been posted for 4 hours!

Thanks in advance!


1. Which of the following statements is TRUE about motor units?

a.) Each muscle fiber contacts several motor neurons.
b.) When motor units are small, a muscle can produce very fine actions.
c.) With smaller motor units, the muscle action is coarse.
d.) None the above are true.

2. Which muscles have striated muscle fibers as their muscle tissue?

a.) Skeletal muscles, like the quadriceps femoris
b.) Integumentary muscles, like facial muscles that can change expressions
c.) Extraocular muscles that move the eyeball
d.) All of the above

2007-10-25 08:03:05 · 4 answers · asked by ~♥♥♥~ 3 in Medicine

A truck with a mass of 4000kg is heading easy just before making a left turn on a flat, rough roadbed at a constant speed of 20 m/s. The radius of curvature of teh road is 100m

A- What is the direction and magnitude of the resultant force on the truck?

B- What is the monimum coefficient of static friction between the truck tires and the roadbed if the truck is not to slip?


HEEEEEELLLLLLLLLLLLLLLp!!!

2007-10-25 07:58:32 · 2 answers · asked by Anonymous in Physics

i need credible sources or references to back the projections..thanks

2007-10-25 07:49:00 · 5 answers · asked by aputtytat 1 in Earth Sciences & Geology

1 . the pores in the pot draw the cold inside
2 . the pores allow contact with outside ambiencewhich lowers the temperature
3 . the pores allow water molecules to move back & forth by cooling it down
4 . the pores allow water to evaporate & the heat for this is taken from the pores inside

2007-10-25 07:45:46 · 5 answers · asked by hems 1 in Chemistry

2007-10-25 07:45:32 · 3 answers · asked by benam 1 in Biology

2007-10-25 07:45:20 · 10 answers · asked by Anonymous in Astronomy & Space

2007-10-25 07:44:19 · 17 answers · asked by Anonymous in Earth Sciences & Geology

2007-10-25 07:40:21 · 7 answers · asked by Anonymous in Engineering

Does anyone have a good recipe for polymer clay which can be made from every day materials?

My daughter and I have made "slime" from glue+H2O+borax solution and had a lot of fun playing with it but now we'd like to try our hand at something firmer and bake-able.

Thanks for your ideas!

2007-10-25 07:39:45 · 3 answers · asked by ♪ 4 in Chemistry

2007-10-25 07:39:28 · 2 answers · asked by lesley7769 1 in Mathematics

If the dead trees and under-brush are cleared out, and the forests thinned some, fires won't spread as much. Would this be a good idea?

2007-10-25 07:37:01 · 6 answers · asked by Anonymous in Botany

2007-10-25 07:35:48 · 5 answers · asked by edwin pimp 2 in Earth Sciences & Geology

Which of the following subsets of P2 are subspaces of P2?

A. { p(t) | p'(t) + 3 p(t) + 1 =0 }
B. { p(t) | p'(t) is constant }
C. { p(t) | p(8)=2 }
D. { p(t) | p(5)=0 }
E. { p(t) | p(-t)=p(t) for all t }
F. { p(t) | p'(4)=p(1) }

2007-10-25 07:34:44 · 1 answers · asked by Guy 1 in Mathematics

2007-10-25 07:32:55 · 2 answers · asked by mandi 1 in Chemistry

it's for science homewrok that has to be in TOMOROW!!
thnx

2007-10-25 07:32:04 · 6 answers · asked by Anonymous in Other - Science