Science & Mathematics - 21 January 2007

2007-01-21 02:21:33 · 2 answers · asked by Malu C 1 in Zoology

2007-01-21 02:20:30 · 8 answers · asked by Anonymous in Mathematics

here is my attempt at the question..

1. The problem statement, all variables and given/known data

A typical virus is a packet of protein and DNA (or RNA) and can be spherical in shape. The influenza A virus is a spherical virus that has a diameter of 85 nm. If the volume of saliva coughed onto you by your "friend" with the flu is 0.010 cm3 and 1/109 of that volume consists of viral particles, how many influenza viruses have just landed on you?


2. Relevant equations

V = 4/3 x pie x r^3


3. The attempt at a solution

I'm thinking that I should take half of 85nm which is 42.5nm and plugging it into the volume formula for a spherical. The volume of the whole spherical virus comes out to be 3.21E-5.

3.21E-5 / 0.010cm^3 = .00321

1/10^9 of .00321 = 3.11E-7 particles?

2007-01-21 02:19:58 · 2 answers · asked by Anonymous in Mathematics

I want to see neat things like comets, satellites, different types of stars, and planets! I would fall in love with this telescope if it was right. Please help me find this telescope. My budget is as said $80-$160. I am a beginner so I do not want something too crazy. I want to start out according to my status, in this case, a beginner. I am in the US and please help me find good stores and good telescopes!

2007-01-21 02:17:33 · 7 answers · asked by Anonymous in Astronomy & Space

2007-01-21 02:16:21 · 12 answers · asked by Faiyaz S 1 in Mathematics

2007-01-21 02:16:09 · 4 answers · asked by Anonymous in Earth Sciences & Geology

I teach middle school science and I'm looking for some new ideas and for people to back up some of the projects I already have in mind.

2007-01-21 02:13:54 · 1 answers · asked by the_gud_one 3 in Other - Science

she only wants to see how long it takes to get a answer really i think

2007-01-21 02:13:27 · 9 answers · asked by L B 1 in Other - Science

I discover that for every level of soduku game that i play, there is only one answer to every combination, yet, there are many combinations of answers, how many, i don't know. anyway, for instance, if i delete one number from the given soduku puzzle, will i get more than one ans?

2007-01-21 02:09:37 · 3 answers · asked by Zzz 1 in Mathematics

2007-01-21 02:04:23 · 6 answers · asked by b_prince 3 in Medicine

We've all done it & been confused by it but has anyone actually needed it in their lives past school?

Billy Connolly had something very funny to say about it in one of his shows - so true!

.

2007-01-21 02:02:20 · 26 answers · asked by Anonymous in Mathematics

need info urgently for my xii exams..

2007-01-21 02:02:00 · 1 answers · asked by dincpurple 2 in Chemistry

Choose independently two numbers a,b at random from the interval[0,1] with unifrom density. The point (a,b) is chosen at random in the unit square with uniform density. Find probability that
1. |a-b| < 0.5;
2. max(a,b) < 0.5;
3. min(a,b) < 0.5;
4. a < 0.5 and 1-b < 0.5;
5. conditions 1 and 4 both hold
6. a+b < 1/2

Any detailed explanations are greatly appreciated. Thank you!

2007-01-21 02:01:37 · 3 answers · asked by Lotus 2 in Mathematics

Best Answer will get 10 Points

2007-01-21 02:00:38 · 28 answers · asked by Sunlight 3 in Geography

2007-01-21 02:00:35 · 15 answers · asked by ? 5 in Weather

2007-01-21 01:55:03 · 4 answers · asked by Emma K 2 in Mathematics

My swimming pool was crystal clear for weeks, but when I went out one morning to take a swim after an electrical storm, there was algae for the first time quite a sudden change in colour. Does this mean that lightning striking water can start life?

2007-01-21 01:54:38 · 9 answers · asked by Anonymous in Biology

2007-01-21 01:51:14 · 17 answers · asked by Anonymous in Mathematics

How does this conversion work. kg/m^3 is equivalent to g/cm^3. The book says scientist use the g/cm^3 form which is equivalent because it is much smaller. I cant figure out how exactly that is equivalent. I see that it must be a 1000 times smaller since 1kg = 1000g, but 1 m is supposed to = 1000 mm. I dont understand their logic in this process. I know 1cm^3 is 0.000001m, but still dont get it. Can someone please show how to do this with work as well. Thanks

2007-01-21 01:46:41 · 5 answers · asked by oriononebay 1 in Mathematics

2007-01-21 01:46:06 · 17 answers · asked by noazark40 1 in Zoology

I have a 45-50 foot tall Silver Maple tree over my 2 story home and bedroom. I am concerned about one of the limbs crashing through my roof in a storm or high wind as the tree is 65+ years old. I would like to reinforce the roof/wall structure. I have a typical 1980 build wood frame home with trusses in the attic. I believe the weight of the branches could easily crash through the entire 2nd story and framing. Any thoughts? I was considering adding 4X4 framing in the attic along with a heavy duty military cargo netting to distribute the load among the entire truss system in case a limb falls on the roof. I would like to avoid a few thousand pound limb falling on me while sleeping. We love the tree - so cutting it down is not an option. I have pictures if needed to understand the situation.

2007-01-21 01:45:04 · 4 answers · asked by Rules Court 1 in Engineering

1. Problem with variables

Consider an 8-year old child whose body mass is 25 kg and is increasing at a rate of 7 kg/year. Assuming that the mass of the kidneys scales with body mass as Mk=0.021 x Mb^0.85, find the rate at which the mass of the kidneys is increasing (in kg/year). Hint: some differential calculus will help guide you to the answer.

2. Relevant equations
Mk = 0.021 x Mb^0.85

3. Attempt at problem

I basically chose the weights 25, 32, 39 etc..each 7 kg apart

Mk = 0.021 x 25^0.85
Mk = 0.021 x 32^0.85
Mk = 0.021 x 32^0.85

The mass of the kidney increased my .07 every time..so would that be the rate of increase?

2007-01-21 01:41:00 · 1 answers · asked by sky l 1 in Mathematics

about the phlebotomist

2007-01-21 01:37:39 · 3 answers · asked by poppya 1 in Biology

2007-01-21 01:36:06 · 18 answers · asked by nbastar51 1 in Astronomy & Space

2007-01-21 01:33:10 · 5 answers · asked by sneha r 1 in Biology

HOW HAS PHYSICS ORIGINATED

2007-01-21 01:26:55 · 7 answers · asked by CHAUVINIST 1 in Physics

2007-01-21 01:20:03 · 4 answers · asked by Gregory C 1 in Chemistry

need all thre answers

2007-01-21 01:17:36 · 5 answers · asked by ander l 1 in Mathematics

One might expect that the product of the mass m times the velocity V of some object would depend on both the external force F applied to the object and the time interval t during which this force is applied, i.e.
mV = F^a·T^b
where a and b are constants to be determined. Using dimensional analysis, show that the correct values of a and b are
1. a=1, b=1/2
2. a=1/2, b=1

I don't get what they're trying to make me find out

2007-01-21 01:13:22 · 5 answers · asked by sky l 1 in Physics

does anyone know of a good website that explains in detail how a liquid expansion thermostat works, its history, gas appliances its used in, etc.
any help appreciated

2007-01-21 01:13:06 · 1 answers · asked by Alan B 2 in Engineering