Science & Mathematics - 3 October 2007

biology ecosystem

2007-10-03 05:12:27 · 3 answers · asked by Anonymous in Biology

2007-10-03 05:07:37 · 10 answers · asked by ǝɯɐuɹǝsn ɔıɹǝuǝƃ 3 in Mathematics

Jane, whose mass is 45.0 kg, needs to swing across a river filled with man-eating crocodiles in order to rescue Tarzan, whose mass is 80.0 kg. However, she must swing into a constant horizontal wind force F on a vine that is initially at an angle of with the vertical. (See Fig. P5.73.) In the figure, D = 50.0 m, F = 118 N, L = 40 m, and theta = 50.0°.
http://www.webassign.net/sercp/p5-73.gif
(a) With what minimum speed must Jane begin her swing in order to just make it to the other side? (Hint: First determine the potential energy that can be associated with the wind force. Because the wind force is constant, use an analogy with the constant gravitational force.)
m/s
(b) Once the rescue is complete, Tarzan and Jane must swing back across the river. With what minimum speed must they begin their swing?
m/s
Any help would probably be appreciated... ^^

2007-10-03 05:07:22 · 1 answers · asked by Bill 1 in Physics

I am solving an electromagnetics equation for Chebysheve transformers. My equation I need to solve is:
sec(theta)m = cosh [1/3 cos h ^-1 (1.73 E -01)]
I am not familiar with the sinh, cosh, tanh, etc functions and am unsure how to evaluate the right side of the equation on my scientific calculator. What is the cosh function, and how would I evaluate it on my scientific calculator (TI-83)?
Thank you.

2007-10-03 05:02:52 · 2 answers · asked by 3ng1n33rgurl 6 in Mathematics

My ap physics class is crazy hard so please help me with this problem!

In a physics lab, a 5.0 kg cart is accelerated across a table by means of a .50 kg hanging mass which is allowed to fall and drag the cart by means of a string and pulley. If the cart moves 1.2 m from rest in 2.0 s, what is the force of friction between the cart and table? what is the tension on the string while the cart is accelerating?

2007-10-03 04:58:22 · 2 answers · asked by adelyn 2 in Physics

1. If x = 2y+7 and y=3 what is x

2. x=6y-10. when y= 2 find x

3. cancel down 36 over 144 and 25 over 200

2007-10-03 04:56:35 · 7 answers · asked by Kimmy 2 in Mathematics

2007-10-03 04:54:50 · 8 answers · asked by Anonymous in Geography

A.) Elements that drop from the wind or water make layers that solidify into mineral.

B.) Minerals form when called magma cools and atoms bond together into mineral crystals.

C.) Minerals form when water that has atoms of dissolved elements in it evaporates away.

D.)None of the above.

2007-10-03 04:54:21 · 4 answers · asked by Katy B 2 in Earth Sciences & Geology

If math is an exact science then i think that if you call the number 33 "thirty three" and the number 21 "twenty one" .... then why not call 16 "onety six"? Shouldn't logic dictate that it should be uniform like that?

2007-10-03 04:53:40 · 3 answers · asked by Anonymous in Mathematics

say your giving blood... is there a difference is your period blood and the blood you give???

2007-10-03 04:47:10 · 10 answers · asked by Anonymous in Biology

The star Mira which is 350 light years away and has a tail that stretches for 13 light years will be visible to the naked eye in november. Even through a telescope will it appear as anything more than a regular star, or will it be possible to see its tail?

2007-10-03 04:44:17 · 3 answers · asked by Spartan 2 in Astronomy & Space

How heavy is the moon?

2007-10-03 04:42:16 · 9 answers · asked by elephant_cat_pink 1 in Astronomy & Space

2007-10-03 04:40:34 · 3 answers · asked by Brian R 1 in Astronomy & Space

maybe about refrigerator ,fan ,washing machine and etc.

2007-10-03 04:37:58 · 4 answers · asked by qi 1 in Engineering

aeronautics---propulsion

2007-10-03 04:37:48 · 4 answers · asked by Anonymous in Engineering

2007-10-03 04:37:26 · 12 answers · asked by WAYNE B 1 in Physics

What happens when friction between the opposite sides of a fault is high?
a. Folding of the crust may occur.
b. The fault locks, and stress builds up until an earthquake occurs.
c.A plateau may form on one side of the fault.
d. The rocks on both sides of the fault easily slide past each other. Most geologists think that the movement of Earth’s plates is caused by


2.
Most geologists think that the movement of Earth’s plates is caused by

Help with w/e you can tyvm please no rude comments thanks!

2007-10-03 04:36:54 · 1 answers · asked by Anonymous in Earth Sciences & Geology

Ok, I'm not much of a math wizz, so I need help solving this.

I have a row colored dots, blue - green - red - yellow
How many combinations can I make out of these, without them changing place at any time? example:

blue - - red -
- green - - yellow
blue - green - - yellow

and so on and so on?

thanks
-larsb

2007-10-03 04:30:11 · 3 answers · asked by larsB 2 in Mathematics

what are running on track 's basics to do it successfully?

2007-10-03 04:24:43 · 2 answers · asked by ? 1 in Mathematics

We would be quite lighter on the moon than on earth so how?

2007-10-03 04:22:44 · 14 answers · asked by Anonymous in Astronomy & Space

2007-10-03 04:21:23 · 7 answers · asked by ndungupatoh 1 in Geography

I am uncertain whether one is allowed to have repeated elements of a sequence An in a subsequence Bn. If for instance the first few terms of An are:

An = 0, 1, 2, 3, 4, 5, 6, 7...

Is this a possible subsequence:

Bn= 0, 0, 0, 0, 0, 1, 1, 2...

I know elements have to stay ordered, but I am not certain of whether they may be used more than once consecutively. I ask this because as a challenge we were asked to find a sequence from which one could find subseqences that would converge to a) Every rational and b) Every irrational. If repeated elements are allowed then the question could be very simply answered, if not then it is more difficult.

2007-10-03 04:20:11 · 1 answers · asked by tom 5 in Mathematics

I was reading an article about the big chill theory which stated, "The Big Chill theory has been around for decades but has been strengthened by the dark energy findings. If dark energy behaves as predicted, the galaxies will recede from each other at an accelerating rate - eventually faster than lightspeed. When that happens, they will literally vanish from view."

I thought nothing could travel faster than the speed of light. Why do scientists believe it can happen in this case?

2007-10-03 04:15:32 · 15 answers · asked by Spartan 2 in Astronomy & Space

4x - 3y + z = 16
x + 2y - z = -3
3x + y +2z = 1

2007-10-03 04:14:11 · 5 answers · asked by tinabug 1 in Mathematics

2007-10-03 04:11:54 · 5 answers · asked by Christopher T 1 in Mathematics

Like, when in a car or a bus , we feel the vehicle moving no matter at what speed it might be moving.(say for example , 60 km/hr)
Then, why don,t we feel the motion of the earth although we are rotating and revoluting at a very fast speed? please ELUCIDATE !!!!
thanks!

2007-10-03 04:09:04 · 10 answers · asked by Anonymous in Astronomy & Space

Algebra II

2007-10-03 04:08:56 · 9 answers · asked by Sir_Bark_A_Lotums 1 in Mathematics

ch3 ch2 ch2 ch2 oH
+
H+
1-Butanol + hydrogen = ?????

2007-10-03 04:01:51 · 2 answers · asked by alexander i 1 in Chemistry

What is this value 22/7 and why does it appear in so many scientific formulas. Is it a magic number or what? Please i really want to understand

2007-10-03 04:01:01 · 8 answers · asked by jazmeen 2 in Mathematics

a)summation notation symbol (n=1 to infinity) of ((n+1)(x^n))/((n^(2n))
b)summation notation symbol (n=0 to infinity) of ((4^(n+1) x^(2n))/(n+3)
c) summation notation symbol ( n=1 to infinity) of ((-1)^(n+1) .1.3.5....(2n-1)(x^n))/(2.4.6.... 2^n)

2007-10-03 03:59:59 · 1 answers · asked by Anonymous in Mathematics