Science & Mathematics - 30 October 2007

A company is constructing an open-top, square based, rectangular metal tank that will have a volume of 67 ft3. What dimensions yield the minimum surface area? Round to the nearest tenth, if necessary.

2007-10-30 17:19:13 · 3 answers · asked by Good Boy 1 in Mathematics

Hi, what is the difference between infimum and minimum?

2007-10-30 17:16:32 · 6 answers · asked by feiyingx 2 in Mathematics

2007-10-30 17:13:09 · 3 answers · asked by Aurelia B 2 in Mathematics

There was an earthquake an hour ago but before it happened, I got dizzy and remained so. This has happened every time we have had sizeable earthquakes in our area and I tend to stay dizzy for a couple hours afterwards. Why would I be so affected? Why would seismic activity make someone dizzy? Thanks :)

2007-10-30 17:12:59 · 5 answers · asked by ms. ovechkin 2 in Earth Sciences & Geology

what was the magnitued

what is the predicted mag in 2008
and what else is predicted so far as quaks in the bay area

2007-10-30 17:09:24 · 2 answers · asked by k 1 in Earth Sciences & Geology

It was discovered by a scientist named Richard Muller in 1983. It supposedly orbits our sun in the outer reaches of the solar system. Theory has it, every 26 million years it causes mass extinctions on earth, like for instance, the killing of the dinosaurs. This star should easily be visible from earth. Where? I don't know. What do you think?

2007-10-30 17:07:26 · 10 answers · asked by ZORRO 3 in Astronomy & Space

2007-10-30 17:04:22 · 7 answers · asked by FRANsuFU 3 in Medicine

Consider two boxes being pulled by a cord across a floor with friction. The lower box has mass m₂ and a co-efficient of kinetic friction μ(k) with the floor. The upper box has mass m₁ and a co-efficient of static friction μ(s) with the lower box. The cord makes an angle Ѳ with the horizontal. Assume that the angle is small enough that m₂ remains in contact with the floor.



1) What is the maximum acceleration such that the little box does not move with respect to the big box
2) Find the tension in the rope in terms of m₁, m₂, μ(k), μ(s), and for this max acceleration
3) Evaluate the tension in the rope at the max acceleration when m₁= 1kg , m₂= 1.5kg , μ(k)= 0.25, μ(s)=0.6 and Ѳ=15

2007-10-30 17:04:18 · 3 answers · asked by basil 1 in Engineering

For Example, In production, we take Ist operation production is 25000 pcs, rejection is 1000 pcs, so we get 24000 pcs for second operation, in sec operation if rejection is 2450, after that another two more operations if have rejections. How we calculate the overall percentage of rejections?

2007-10-30 17:04:16 · 3 answers · asked by peri 1 in Engineering

you are designing a decorative lamp to hang in an express elevator. The lamp has three sections that hang one directly bellow the other, connected by thin wires.The lamp is also attached to the ceiling by a single thin wire. Each section of the lamp weighs 5 N . determine the max tension of each wire if the elevator comes to an emergence stop from a speed of 5m/s over a distance of 3.8 m.

2007-10-30 17:02:56 · 3 answers · asked by basil 1 in Engineering

Find the P-value for all

1. the test statistic in a right-tailed test is z= 0.52

2. the test statistic in a two-tailed test is z= 1.95

3. In a sample of 88 children selected randomly from on town, it is found that 8 of them suffer from asthma. Find the p-value for a test of the claim that the proprtion of all children in the town who suffer from asthma is equal to 11%

2007-10-30 17:02:49 · 3 answers · asked by Dee R 2 in Mathematics

I have to draw a picture of and enzyme and a substrate then the substrate enzyme complex and the enzyme and product, but I have no idea what a good example of an enzyme. The example we were given was a girl plucking a flower apart and then the finished product being the flower in pieces but since the example can not be copied I have no ideas. and help is appreciated

2007-10-30 16:56:59 · 3 answers · asked by Anonymous in Biology

Imagine an aquatic animal that lives in fresh water. Would the animal's body fluids be relatively hypotonic or hypertonic to its environment?

Imagine a freshwater plant that has recently been places in seawater. Would the plant tend to gain or lose water. Explain.

2007-10-30 16:56:13 · 2 answers · asked by V.MarVelous 2 in Biology

Ok so Saturday I ate half of a poppy seed bagel and today I took a pre-employment drug test. Will that cause a false positive? I have never abused my body and I really need this job!

2007-10-30 16:48:09 · 4 answers · asked by ? 2 in Medicine

If we emerged from a pool of primordial ooze after being struck by lightening and created by mere chance. What chance is it that we are on this Earth for a purpose. We live, we die, we become extinct. For no purpose unless we evolve into a higher life form which seems unlikely. It seems we have stretched eveloution to our limit. It is more likely the cockroach will take over from here. How many say we can take it one more notch and how many are for the cockroach?

2007-10-30 16:45:13 · 10 answers · asked by Anonymous in Biology

2007-10-30 16:43:51 · 1 answers · asked by jvhrrr23 1 in Earth Sciences & Geology

if energy cannot be destroyed, why do organisms have to continually harness energy?

2007-10-30 16:43:09 · 5 answers · asked by candy 3 in Biology

I've got science homework due tomorrow: I need help to get that question answered. I'd also like to know just how one can find out how many chloroplasts are in an Elodea leaf to begin with. I will be using a Compound Light Microscope to view samples.

2007-10-30 16:37:36 · 1 answers · asked by Anonymous in Biology

and give me examples of fish having this coloration

2007-10-30 16:35:50 · 4 answers · asked by canada562001 1 in Zoology

http://quake.wr.usgs.gov/recenteqs/Quakes/nc40204628.html

2007-10-30 16:33:55 · 1 answers · asked by Anonymous in Earth Sciences & Geology

During a serve, a tennis racket of mass 1.1 kg is given an angular acceleration of 160 rad/sec2. At the top of the serve, the racket has an angular speed of 14 rad/sec.

If the distance between the top of the racket and the shoulder is 1.4 m, what is the total acceleration of the top of the racket?

2007-10-30 16:29:45 · 1 answers · asked by Anonymous in Physics

Do you know the reason that they do this?
(I'm probably not asking this in the right section..but I don't know which other section to go to. )

2007-10-30 16:29:18 · 6 answers · asked by Deenie 6 in Paranormal Phenomena

How can I tell apart a geometric series from an alternating? Example: ∑ ((-6)^n-1)/(5^n-1), where n =1 and goes to infinity.

∑((-1)^n-1)/(n^6), where n=1 and goes to infinity.

Which is which? Should I just try to identify a and r, and if I get them, then is a geomtric? In other words, if I find the ratio, that proves the series to be geometric?

2007-10-30 16:29:11 · 3 answers · asked by Jorm 3 in Mathematics

at ab0ut 8 0 cl0ck. STRONG!!

2007-10-30 16:27:59 · 10 answers · asked by d0min0 1 in Earth Sciences & Geology

Why is it that for a hyperbola
y^2/ a^2 - x^2/ b^2 = 1

we can solve for the asymptotes by solving the equation
y^2/ a^2 - x^2/ b^2 = 1

2007-10-30 16:24:59 · 1 answers · asked by Anonymous in Mathematics

pumpkins,Science report,

2007-10-30 16:20:52 · 3 answers · asked by Anonymous in Botany

its supposed to be simple and for an 8th grader. something like a better lock for your house (exept I cant think of anything like that) and nothing to complicated. and its also supposed to drawn on cardboard. Please help me!!!! ...thanx

2007-10-30 16:20:32 · 7 answers · asked by Anonymous in Other - Science

john saw 3 witches land in a field where they found a pile of pumpkins and a ghost. they agree to sleep over night in the field and divide up the pile of pumpkins up in the morning. during the night one witch wakes up and gives one pumpkinto the ghost taking exaclty 1/3 of the rest of pumpkins and falls back asllep. then the second witch wakes up and does the samething later the third witch wakes up and does the same. in the morning there are fewer than 10 pumkins left. they each take 1/3 how many pumpkins were there in the original pile?

2007-10-30 16:19:17 · 5 answers · asked by batgirl 2 in Mathematics

2007-10-30 16:15:44 · 4 answers · asked by Kay-Kay Maddry Catz S 1 in Biology

Hey iam working in manufacturing company as a asst mang in maintenance and my work experience is one and half years . MY intrest is on VLSI Design, If i move to Vlsi design my work experience will not add if i move to oracle my work experience add and fetch more CTC. Is oracle best or VLSI design best for me

2007-10-30 16:14:45 · 1 answers · asked by sai 1 in Engineering