Science & Mathematics - 12 November 2006

I have a friend who says that he is going to start farming them in Tennesee

2006-11-12 16:56:29 · 4 answers · asked by Anonymous in Botany

Should we (a) intervene and import new wolves to help control the moose population or (b) let the moose population grow until it exceeds its carrying capacity and suffers another population crash? Explain your reasoning.

2006-11-12 16:54:12 · 1 answers · asked by Dave 4 in Biology

Charles ran the first leg of a 12 km road race at a speed of 9 km/hr and the remainder of the race at 10 km/hr. If his time for the whole race was 1.25 hours, how long was the first leg of the course?

work too please. thank you very much. appreciate it. :]

2006-11-12 16:53:44 · 7 answers · asked by bluenecklace 2 in Mathematics

2006-11-12 16:52:02 · 2 answers · asked by Crystal 2 in Zoology

2006-11-12 16:51:55 · 2 answers · asked by Anonymous in Biology

How much of an 80% nitric acid solution must be added to a 175 g of a solution that is 12% nitric acid to produce a 60% nitric acid solution??

work too please. thank you very much. appreciate it. :]

2006-11-12 16:49:44 · 3 answers · asked by bluenecklace 2 in Mathematics

a mechanical sorter can process a bag of mail in 18 minutes. After the sorter has been working for a time, it breaks down. The rest of the mail it was sorting is divided equally between two older machines, each of which would take 60 minutes to complete the job working alone. The mail is finished being sorted 20 minutes after the first machine started working. How long did the first machine work before breaking down??

work too please. thank you very much. appreciate it. :]

2006-11-12 16:48:31 · 4 answers · asked by bluenecklace 2 in Mathematics

Show, with the aid of the Pigeon-hole principle, that given any eleven integers, there must exist two of them whose difference is of magnitude which is a multiple of 10.

Can anyone pls help? Thanks!

2006-11-12 16:45:36 · 4 answers · asked by sky_blue 1 in Mathematics

2006-11-12 16:44:19 · 2 answers · asked by Pancham 2 in Other - Science

2006-11-12 16:44:03 · 11 answers · asked by Ad Just 4 in Weather

There are n children seated in a circle on the floor. The teacher walks behind the children in a clockwise direction with a box of candies. Starting from a given child, she drops a candy behind this child. She then skips one child and drops a candy behind the next child. Now, she skips two children and drops a candy behind the next child. She continues in this way, at each stage skipping one child more than at the preceding stage before dropping a candy behind the next child.

(a) For n = 4,5,6,7,8 determine which children will have been given candies and the corresponding number of candies given at the 9th stage.

(b) For those values of n in (a) above, which children do you think will never receive any candy? Prove it mathematically.

Can anyone pls help? Thanks!

2006-11-12 16:43:17 · 2 answers · asked by sky_blue 1 in Mathematics

2006-11-12 16:33:54 · 3 answers · asked by Anonymous in Biology

How many positive values of n are there such that the geometric series 1 + 2 + 2^2 + ... +2^n is divisible by 9?

Please help me on this. Thanks!

2006-11-12 16:32:26 · 2 answers · asked by sky_blue 1 in Mathematics

Given a sinusoidal AC signal, I want to be able to clip the amplitude. :)

2006-11-12 16:30:34 · 2 answers · asked by frostwizrd 2 in Engineering

You launch your physics textbook along a horizontal desk with an initial speed of 5.0 m/s. The kinetic coefficient of friction is .15. Find the acceleration of the textbook and the stopping distance.

2006-11-12 16:26:06 · 2 answers · asked by sowheredoibegin 1 in Physics

You ( of 70 kg mass) are riding in an elevator going up with an acceleration of 3 m/s ^2. How much force does the elevator's floor exert on you?

b) Answer the same question when the elevator is moving down with the same acceleration.

2006-11-12 16:23:44 · 4 answers · asked by sowheredoibegin 1 in Physics

A yam is put in a hot oven, maintained at a constant 200Celsius. Suppose that the yam's initial temperature is 20C, and it is initially increasing at 2C/min. After t minutes in the oven, the yam's temperature is T(t) = a[1-e^(-kt)]+b, where a, b, and k are constants.
Find a, b, and k.

2006-11-12 16:21:41 · 3 answers · asked by Hatori H 1 in Mathematics

You want to move a 200-kg piano up a 30 degree incline. The static coefficient of friction is .80 and the kinetic coefficient is .30.
a) What is the minimum force you need to push with to get the piano moving?
b) How much force is needed to keep the piano moving up the incline at constant speed?

2006-11-12 16:20:51 · 3 answers · asked by sowheredoibegin 1 in Physics

2006-11-12 16:19:24 · 3 answers · asked by Leon L 1 in Mathematics

For example, if a girl has an 8 1/2 by 11 in paper, and she cuts out a 3 by 3 square, what is the total perimeter now?

2006-11-12 16:17:03 · 7 answers · asked by Emily 2 in Mathematics

I know basic chemistry, but help me out with this one. On the Periodic Table of Elements, there are several elements which are artificially produced. An element is the most basic, simple thing. So how can one create a new one working only with existing elements? Also, why are some listed on the Table, though they are noted as "Not Yet Produced". How can they even be on the Table if they don't exist?

2006-11-12 16:16:59 · 4 answers · asked by ? 5 in Chemistry

I already know, but isn't that cool?

2006-11-12 16:16:22 · 10 answers · asked by Anonymous in Mathematics

Rover, the dog who loves calculus, can run twice as fast as he can swim. On a sunny day, you take him to the beach, which is very straight and long, and throw a ball into the water for him to retrieve. The ball lands at point B, which is 5 meters offshore and 20 meters down the beach from Rover R. After calculating with his paws in the sand for a few seconds, Rover chooses the path that gets him to the ball as quickly as possible. What path does he choose?

Is there pythagorean theorem in this? Is dr/dt = 2s (i.e. two times swimming time)?

2006-11-12 16:14:57 · 3 answers · asked by ben_ev0lent 1 in Mathematics

2006-11-12 16:14:08 · 11 answers · asked by Anubus 1 in Earth Sciences & Geology

A soup can in the shape of a right circular cylinder is to be made from two materials. The material for the "sides" costs $.015 per square inch and the material for the two "lids" costs $.027 per square inch. The can must have a volume of 16 cubic inches. Find the dimensions of the can that minimize the cost of the can.

Do I just minimize the amount of material or is there someway I have to take into consideration the costs when finding the dimensions? What is your answer?

2006-11-12 16:11:34 · 3 answers · asked by ben_ev0lent 1 in Mathematics

a.) .848 g/L
b.) 1.55 g/L
c.) 1.70 g/L
d.) 1.85 g/L

please show work!

2006-11-12 16:11:00 · 7 answers · asked by Alyssia S 1 in Chemistry

ok i ama bit confused when you have an object hangng from two cables... i know you do F1 F2 F3 and you come up with two variables and solve for eachother. say you have a lamp hanging that weighs 150N and the angles are 35 degrees and 15 degrees how would i solve that?

2006-11-12 16:10:47 · 1 answers · asked by socom_lover 2 in Physics

how do you write a vector equation with a given point (_ , _) and a slope?

2006-11-12 16:08:38 · 3 answers · asked by trish 2 in Mathematics

If sin(theta)=theta, what does cos(theta)= ? too? (for small angular aproximation)

2006-11-12 16:08:17 · 4 answers · asked by Dani S 1 in Mathematics

Please attach proper back-ups for the answer as i have to prove it. also tell me some useful links for such related discussions.

2006-11-12 15:56:02 · 1 answers · asked by just a kid 1 in Engineering