Science & Mathematics - 11 October 2007

I was just a kid, it wouldv'e been like examining myself, I didn't do it, but I still think about that class.

2007-10-11 09:02:26 · 6 answers · asked by Anna 1 in Biology

2007-10-11 08:59:56 · 6 answers · asked by Anonymous in Earth Sciences & Geology

is there a type of plastic that once it is bent out of its orignal shape you can use electricty to get it back orignal form if so whats it called

2007-10-11 08:59:52 · 1 answers · asked by Talking Hat 6 in Other - Science

I am working on a couple of papers and am not sure which star formations I want to write about, what are some of your favorites?

2007-10-11 08:58:51 · 3 answers · asked by Whoa 2 in Astronomy & Space

Problem Set:Final Velocity and Displacement

1) A bike rider accelerates constatntly to a velocity of 7.5m/s during 4.5 sec. The bike's displacement is +19m. What was the initial velocity of the bike?


2)The pilot stops the same plane in 484m using a constant acceleration of 8.0m/s^2. How fast was the plane moving before braking began?


3)A person with a shoulder harness can survive a car crash if the acceleration is smaller than -300m/sec^2. Assuming constant acceleration, how far must the front end of the car collapse if it crashes at 101km/hr?


4) A car is initially sliding backwards down a hill at -25km/hr. ZThe driver changes the direction of the car. By the time the car's velocity is is + 35km/h, it is 3.2 m from its starting point. Assuming the car was uniformly accelerated, find the acceleration.



Please help me explain any answer, this will be very helpfull. Thank you:)

2007-10-11 08:57:49 · 3 answers · asked by Anonymous in Physics

2007-10-11 08:54:50 · 3 answers · asked by CSSM girl 1 in Astronomy & Space

2007-10-11 08:54:02 · 2 answers · asked by xoxopink129 1 in Chemistry

How many electrons are being transferred in the following redox reaction?
Cu(s) + ZnCl2(aq) --> Zn(s) + CuCl2(aq)

2007-10-11 08:50:20 · 4 answers · asked by Sky N. 1 in Chemistry

A 20.0 wood ball hangs from a 2.10 -long wire. The maximum tension the wire can withstand without breaking is 600 . A 0.900 projectile traveling horizontally hits and embeds itself in the wood ball.

2007-10-11 08:48:50 · 2 answers · asked by gbutterfly339 1 in Physics

When it is closest to earth, venus is ~90million km away. How long does it take a radar signal to go out to venus and return?


Please help :D Im not sure if i need a formula but i cant find anything about it in my text book.

2007-10-11 08:46:44 · 5 answers · asked by kelly 2 in Astronomy & Space

A 20.0 wood ball hangs from a 2.10 -long wire. The maximum tension the wire can withstand without breaking is 600 . A 0.900 projectile traveling horizontally hits and embeds itself in the wood ball.

2007-10-11 08:44:10 · 1 answers · asked by gbutterfly339 1 in Physics

Will the human mind ever be able to really grasp it?

2007-10-11 08:43:51 · 10 answers · asked by Anonymous in Astronomy & Space

2007-10-11 08:42:55 · 10 answers · asked by Mr. Dog 4 in Mathematics

This is attached to Science/Math/Alternative/Parapsychology Category. Am I wasting my points here? I want answers from people who are familiar with parapsychology. Am I in the wrong place for that? Does this happen in every site..or just this one and R&S?

2007-10-11 08:42:46 · 9 answers · asked by Deenie 6 in Parapsychology

please list your source so I know it's true

2007-10-11 08:41:26 · 6 answers · asked by Molly M 2 in Chemistry

t t = 0, an object is projected with a speed v0 = 35 m/s at an angle q0 = 20° above the horizontal.The axes on the diagram show the x and y directions that are to be considered positive.

For parts a-g, calculate the requested quantities at t = 7 s into the flight:
a) The vertical acceleration of the object:

ay = m/s2 *
-9.8 OK
b) Its horizontal acceleration:

ax = m/s2 *
0 OK
c) Its vertical velocity:

vy = m/s
d) Its horizontal velocity:

vx = m/s
e) The angle to the horizontal at which the object is traveling (an angle above the horizontal should be reported as a positive number; an angle below the horizontal should be reported as a negative number). Please give your answer in degrees.

angle = °
f) Its vertical displacement, from where it started:

y = m
g) Its horizontal displacement, from where it started:

x = m
h) At what time does the object reach its maximum height?

tymax = s

2007-10-11 08:35:27 · 1 answers · asked by Anonymous in Physics

does anyone know how to convert VECTORS from oe for to another??[ say from cartesian to polar or spherical] it wud be helpful if u take a numerical example!!!!

2007-10-11 08:32:53 · 1 answers · asked by adarsh2503 2 in Engineering

2007-10-11 08:25:05 · 14 answers · asked by Duck 1 in Agriculture

Would if help determine the paternity better if the mother does a sample too? I was doing research online about home kits, and the alleged father and the child is one price, and then the alleged father, child, and mother.. Why is there an option for the Mother to do it or not?

2007-10-11 08:24:01 · 1 answers · asked by RoOgUrL85 2 in Biology

Not To Complicated Please!!

2007-10-11 08:14:23 · 3 answers · asked by Anonymous in Engineering

2007-10-11 08:13:31 · 3 answers · asked by Goodaz 1 in Chemistry

1. Given a 10.00 g sample of Na2SO4 ∙ 10H2O, what weight of anhydrous sodium sulfate can be obtained after driving off the water?

2. Calculate the percentage, by weight of each of the elements (C,H) in cyclohexame. [---- we were not given the weights of these]

3. The molecular formula of cyclohexane, an organic solvent, is C6H12. Calculate the mass of a mole of material in grams.


Please show work. Any help is appreciated -- Thank you very much in advance!!

2007-10-11 08:12:45 · 2 answers · asked by Kate 1 in Chemistry

A 1100 N crate is being pushed across a level floor at a constant speed by a force of 300 N at an angle of 20.0° below the horizontal.
(a)What is the coefficient of kinetic friction between the crate and the floor?

(b)If the 300 N force is instead pulling the block at an angle of 20.0° above the horizontal, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in (a).

I know the number is close to .2562 for (a). I was trying different things and that answer was within 10%, but I have no idea what I did, and no idea what I did wrong

2007-10-11 08:11:40 · 3 answers · asked by swimchic632 2 in Physics

2007-10-11 08:11:14 · 2 answers · asked by Goodaz 1 in Chemistry

2007-10-11 08:10:14 · 1 answers · asked by Anonymous in Chemistry

Help Please!!
What is the prime factorization of 42, 68, and 105!!

(6th grade Math!!)

2007-10-11 08:07:06 · 4 answers · asked by Anonymous in Mathematics

??

2007-10-11 08:03:29 · 7 answers · asked by Sorakairi 2 in Mathematics

Change y = x^2 + 14x -14 to standard form by completing the square.

The equation of the axis of symmetry is x =____

2007-10-11 08:01:41 · 3 answers · asked by Anonymous in Mathematics

2007-10-11 07:55:19 · 5 answers · asked by Anonymous in Chemistry

ex..people in prison who know how to astral travel and have nothing else to do..and want to cause harm to others.(Please don't answer unless you are familiar with astral travel and know it happens)

2007-10-11 07:54:38 · 6 answers · asked by Deenie 6 in Parapsychology