Science & Mathematics - 5 February 2007

I was given 2 images of embryos which look very similar. One is a chick and the other is a human. It's not required to see them. Questions:
1. The embryos look very similar. Does this mean they have very similar DNA?
2. How could you test the above?
3. By altering the hormal/environmental conditions of either embryo, could you turn it into another kind of embryo?

First helpful answer gets 10 points..

2007-02-05 14:32:55 · 3 answers · asked by Anonymous in Biology

(a) Determine the length of an open organ pipe that emits G# above middle C (415 Hz) when the temperature is 19°C.

2007-02-05 14:32:39 · 1 answers · asked by Anonymous in Physics

vectors, force, angle, distance

2007-02-05 14:31:21 · 2 answers · asked by rskage 1 in Astronomy & Space

Can someone give me a method of distilling water by freezing? I am doing an experiment where I compare methods of desalinating water and this is one theory I am testing. Can someone please help?

2007-02-05 14:30:51 · 3 answers · asked by Anonymous in Chemistry

2x - 4y = 18
-3x + 2y = -19

9x + 12y =45
-3x + 2y = 21

-24x + 40y = -32
3x + 4y = 13

2007-02-05 14:28:56 · 3 answers · asked by xinnybuxlrie 5 in Mathematics

For example, a planet-thick shell of lead at 3K with an inner radius of 13 billion light years or so.

This is why the sky is mostly dark. Also, the universe expands due to the gravitational pull from objects outside of the shell.

2007-02-05 14:28:48 · 7 answers · asked by Anonymous in Astronomy & Space

I have recently come across this question in an anatomy class I am taking, and would like to know your opinions.

The cranium encases the brain, central nervous system. Why is it an effective protective barrier, and do you think there could be any way to improve on the design to increase protection?

If the design was utilized, would there be any downsides or areas comprimised by the change?

Your opinions are *greatly* appreciated.

2007-02-05 14:27:11 · 1 answers · asked by Anonymous in Medicine

2007-02-05 14:26:50 · 2 answers · asked by icmylan 1 in Zoology

True or False? Given that two bodies interact via some force, the accelerations of these two bodies have the same magnitude but opposite directions. (Assume no other forces act on either body.)


and


According to Newton's 3rd law, the force on the (smaller) moon due to the (larger) earth is


a. greater in magnitude and antiparallel to the force on the earth due to the moon.


b. greater in magnitude and parallel to the force on the earth due to the moon.


c. equal in magnitude but antiparallel to the force on the earth due to the moon.


d. equal in magnitude and parallel to the force on the earth due to the moon.


e. smaller in magnitude and antiparallel to the force on the earth due to the moon.


f smaller in magnitude and parallel to the force on the earth due to the moon.

2007-02-05 14:26:47 · 3 answers · asked by M 1 in Physics

4y+4x=0
-y-2=X Solve the elimination

2007-02-05 14:26:32 · 6 answers · asked by cncdataentry 1 in Mathematics

2007-02-05 14:26:30 · 5 answers · asked by Anonymous in Earth Sciences & Geology

I've been singing and playing insturments, writeing songs for about 3 years. Everywhere I go I get people telling me that i'm gonna be a star. My parents said they will let me try out for american idol when im sixteen but I would like to get noticed before then what can I do?

2007-02-05 14:26:08 · 4 answers · asked by Anonymous in Earth Sciences & Geology

A cable passes over a pulley. Because the cable grips the pulley and the pulley has zero mass, the tension in the cable is not the same on opposite sides of the pulley. Then force on one side is 167 N, and the force on the other side is 64 N. Assuming the pulley is a uniform disk of mass 1.56 kg and radius 0.334m, determine the magnitude of its angular acceleration.

2007-02-05 14:26:00 · 2 answers · asked by Anonymous in Physics

2007-02-05 14:25:36 · 9 answers · asked by icmylan 1 in Zoology

The A string on a string bass is tuned to vibrate at a fundamental frequency of 51.0 Hz. If the tension in the string were increased by a factor of 3, what would be the new fundamental frequency?

2007-02-05 14:24:28 · 1 answers · asked by Anonymous in Physics

2007-02-05 14:23:43 · 3 answers · asked by Anonymous in Biology

What is the upper limit of magnification for a light microscope?

2007-02-05 14:23:39 · 1 answers · asked by kuzya 1 in Biology

A model airplane whose mass is 0.864 kg is tethered by a wire so that it flies in a circle with radius 24 m. The airplane engine provides a net thrust of 0.742 N perpendicular to the tethering wire.

a) Find the torque the net thrust produces about the center of the circle.

b) Find the angular acceleration of the airplane when it is in level flight.

c) Find the linear acceleration of the airplane tangent to its flight path

2007-02-05 14:23:24 · 2 answers · asked by Anonymous in Physics

1. Which is longer...
100% of a yard or 10% of a mile?


2. Which is longer...
50% of a meter or 90%of a yard?


3. A number of girls are standing in a circle. They are evenly spaced and are numbered beginning with 1. Number 5 is opposite Number 16. How many girls are in the circle?


An archiologist claims to have found a coin that was dated 46 B.C. Do you think he really did?

Explain.

2007-02-05 14:22:58 · 4 answers · asked by Pink*advice 2 in Mathematics

i think i am a little bit confuzed about this. it is my homework,i did the problems, but i am not sure if i got them right. if i got them wrong, could you take me through the problem?


6 divided by 1/3=18
7 divided by 2/3=10 1/2
11 divided by 3/4=14 2/3
11 divided by 4/9=24 3/4
7 divided by 3/10=23 1/3
3 divided by 2/5=7 1/2
7 divided by 2 8/9=2 11/26

2007-02-05 14:22:25 · 5 answers · asked by ☀☁❄☀❄rawr 4 in Mathematics

An engineering student has been given the assignment of designing a
hydraulic holding system for a hay baling system. The system has four
cylinders with 120mm diameter pistons with a stroke of 0.320m. the lines
connecting the system are 1 cm in id (inside diameter). There are 15.5
m of lines in the system. For proper design the reserve tank should
hold a minimum of 50% more than the amount of hydraulic fluid in the
system. If the diameter of the reserve tank is 30.48 cm, what is the
shortest height it should be?

2007-02-05 14:22:16 · 2 answers · asked by Angela 1 in Engineering

2007-02-05 14:21:31 · 3 answers · asked by Klinker 2 in Biology

Does both bacteria and archaera lack membrane enclosed organelles?

2007-02-05 14:21:19 · 2 answers · asked by ? 3 in Biology

I missed a lesson of Algebra II (soccer game) and want to know how to graph radicals. Like

Y= 3 * squareroot of X
or
y= 1/2 * squareroot of X + 5

and could you tell me the transformations from the parent function.
e.g. 3 down, twice as steep, 2 to the left

2007-02-05 14:21:11 · 1 answers · asked by Francisco E 1 in Mathematics

5 properties of Carbon Dioxide

2007-02-05 14:20:48 · 3 answers · asked by kiwi 1 in Chemistry

And if you weren't born with a natural telepathic ability, how do you establish a telepathic link?

2007-02-05 14:20:43 · 31 answers · asked by Chichiri 1 in Parapsychology

2007-02-05 14:20:15 · 10 answers · asked by matt 2 in Astronomy & Space

I'm just curious if Pre-Cal, Applied and Consumer math exist outside of Canada? Or are they just a Canadian thing, if so, what kinds of Maths does your school offer and where are you from??

2007-02-05 14:18:23 · 1 answers · asked by Mimi149 6 in Mathematics

Recall that a “disconnection” of X means a pair of nonempty separated sets A,B for which X = A \/ B.
Remember also that if C is a component of X, C is not necessarily “one piece in a disconnection of X.”
Prove that X has only finitely many components n(n>=2)
iff X has only finitely many disconnections.

any help please.
thank you.

2007-02-05 14:18:08 · 1 answers · asked by Kevin B 1 in Mathematics

Please me:

1. Real springs have mass. How will the true period and frequency differ from those given by the equations for a mass oscillating on the end of an idealized massless spring?

2. How could you double the maximum speed of a SHO (Simple Harmonic Oscillator)?

For these problems, please show and explain your work so that I can understand this topic in Physics better! Some answers from the back of the book are listed but I can't seem to get them right.

1. When a 65kg. person climbs into a 1000kg car, the car's springs compress vertically by 1.9 cm. What will be the frequency of vibration when the car hits a bump? Ignore damping.
(0.89 Hz)

2. A piece of rubber is 50 cm long when a weight of 35 N hangs from it & is 85 cm long when a weight of 70 N hangs from it. What is the "spring" constant of this piece of rubber?

3. If a particle undergoes SHM w/ amplitude .15m, what's the total distance it travels in 1 period.

2007-02-05 14:17:46 · 1 answers · asked by hdwong58 3 in Physics