Science & Mathematics - 29 June 2006

For a human body falling though air in a spread-eagle position, the numerical value of the constant D is about D = 0.250 kg/m.

What value of D is required to make v_t = 42.0 m/s the terminal velocity of a skydiver of mass 85.0 kg? answer in kg/m
Take the free fall acceleration to be g = 9.80 m/s^2.

If the sky diver's daughter, whose mass is 40.0 kg, is falling through the air and has the same D (D=0.25 kg/m) as her father, what is the daughter's terminal speed?

Im not sure if D is drag constant, question does not clarify.

2006-06-29 09:14:06 · 5 answers · asked by Sagely 4 in Physics

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whats the mph of a .22 cal bullet?

2006-06-29 09:12:17 · 5 answers · asked by michael e 1 in Physics

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How do I write an equation for this line?

How would I go about doing the following:

Write an equation for the line that passes through the point (7,5) and is perpendicular to the line -7x-9y=14 ?

Thanks in advance, I really appreciate it!

2006-06-29 09:07:57 · 11 answers · asked by Anonymous in Mathematics

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Does anyone think the us moon landing was faked?

I HAVE HEARD SOOOO MANY STORIES AND RUMORS AND WONDERED WHAT OTHER PEOPLE THOUGHT

2006-06-29 09:05:34 · 45 answers · asked by mattb77 3 in Astronomy & Space

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Why are the NASA shuttle launch windows so narrow?

2006-06-29 09:03:00 · 5 answers · asked by carobygirl 6 in Astronomy & Space

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Monarchs and Milkweed question?

Apparently, Monarch butterfly caterpillars are poisonous to most would be predators because of the protection conferred upon them due to feeding on milkweed. If it is correct that Monarch butterflies' survival has been enhanced by this selective adaptation (by their larvae being able to tolerate the toxins in milkweed), and this gave them a competitive advantage in the natural world, then why aren't milkweeds crawling with all sorts of other species of caterpillars gaining similar protection? In other words, why did only Monarch caterpillars hit on this means of protection from predation, when other butterflies and their larvae could have also adapted to milkweed? If the Monarch butterly gained this tolerance to milkweed through a chance mutation, then why did chance favour *only* the Monarch butterfly and not other butterflies..?

2006-06-29 09:02:12 · 3 answers · asked by Dr. Bill 2 in Biology

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how is motor alignment done with dial give A to Z knowledge & procedure.?

motor alignment is usually done for high speed motors , i want to know how this alignment is done.

2006-06-29 08:56:51 · 2 answers · asked by rose s 1 in Engineering

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Would it be possible to make a self charging battery system?

If I took an alternator out of a car and hooked to a 12 V car battery, then hooked up a electric motor (powered by the battery) to the alternator and had all three in a circle, would the battery have enough power to run the motor and would the motor have enough power and RPM's to run the alternator and charge the battery?

2006-06-29 08:56:24 · 6 answers · asked by Jeffrey A 2 in Engineering

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What do you do?

You are presented with 3 doors from which to choose. Behind one of them, there is a prize, the other 2 are empty. You select a door but before being shown what's there, one fo the other doors is opened and shown to be empty. You are given the choice to change your pick to the remaining unopened door. Do you change? What are the odds of winning the prize and why.

2006-06-29 08:52:24 · 9 answers · asked by Rick C 2 in Mathematics

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Is a Sable an antelope ?

2006-06-29 08:51:56 · 5 answers · asked by TRAPACE 1 in Zoology

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What does the 'C' in CRP (or C reactive protein) stand for?

2006-06-29 08:48:01 · 2 answers · asked by comptonkid 1 in Medicine

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Why do people still confuse global warming with the depletion of the ozone layer?

Global warming is due to CO2 emmisions into the atmosphere that serves as an insulator to absorp radiated heat from the earth's surface. The ozone (O3) is a whole different subject that has nothing to do with global warming, but why then do people still confuse the two?

2006-06-29 08:46:42 · 11 answers · asked by Rochlina 2 in Weather

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the mass extintion theory about the comet or asteroid killing the dinosaurs has fallen into question why?

2006-06-29 08:41:24 · 9 answers · asked by superkalel 1 in Earth Sciences & Geology

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What is the funniest #?

2006-06-29 08:39:33 · 35 answers · asked by broken7792 1 in Mathematics

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do ppl actully use algebra in real life?

2006-06-29 08:38:03 · 23 answers · asked by Anonymous in Mathematics

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Our Universe is so expanded... But do you think there is really an end to its length?

If you ever saw Men in Black 2, in the end there is a nice clip where our Universe is just a sphere in some other EVEN BIGGER world. That got me into asking... does our Universe really has an end?? Does it expand as time goes on? Who can understand this dimention we live in!!

Oh, and while we're at it, could you tell me about all possible dimentions you know of and what do we mean by dimentions, because half an year ago when I was researching UFOs I've learned that some people think some UFOs come from another dimention cause they change shape and color sometimes too! Interesting isn't it?

Well, speak your opinion. I want to hear it!

2006-06-29 08:37:49 · 26 answers · asked by brother from QG 3 in Astronomy & Space

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Do the rotations of hurricanes/typhoons differ, in the Northern Hemisphere, from the Southern Hemisphere?

Does the polarity, or any properties of the magnetic fields surrounding the earth, influence the cyclical direction, such as clockwise or counterclockwise, of typhoons or hurricances? If the rotations are different, why?

2006-06-29 08:36:31 · 4 answers · asked by far_north_grizzly 1 in Weather

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