Science & Mathematics - 4 November 2006

If you have 500,000 cells to start and you do a 10 to the 4th power dilution (a step series of 1:10 dilutions), how many cells do you have? Using the same information, how many cells would you theoretically have after the 2nd dilution (1:10 performed in each step)?

a) 5,000,000 b) 5 c) 5,000 d) 500 e) 500,000,000

2006-11-04 12:23:54 · 4 answers · asked by csumicro 1 in Biology

because I need answer the following questions.

The formal charge on the tin atom.
The formal oxidation number of the tin atom.
The overall charge of the molecular species shown.

If anyone knows how to do these questions..please show me a step by step solution..thank you.=)

2006-11-04 12:18:55 · 2 answers · asked by ichigokun 1 in Chemistry

This is no longer an alkene ..so do you just look for the Csp3 bonded to H?

2006-11-04 12:16:37 · 2 answers · asked by Kiya 2 in Chemistry

http://www.m-w.com/dictionary/zoology

2006-11-04 12:13:52 · 8 answers · asked by Anonymous in Zoology

how do i factor x^2-7x-18 ? Please give a detailed answer because i know nothing about math.

2006-11-04 12:11:00 · 10 answers · asked by Dianne 1 in Mathematics

I've managed to pull and equation this far... I'm not sure if its possible to finish...

48cosX = 0.4(980 + 48sinX)

x being an unknown angle, of course....can anyone solve this?

2006-11-04 12:10:55 · 8 answers · asked by Anonymous in Mathematics

anyone know the steps to solving this? or the general rule?

2006-11-04 12:09:43 · 6 answers · asked by fdsfsjk k 3 in Mathematics

A. 30 Degrees Farenheit

B. 85 Degrees Farenheit

2006-11-04 12:04:06 · 8 answers · asked by Anonymous in Chemistry

A. 15 Degrees Celsius

B. 25 Degrees Celsius

2006-11-04 12:02:13 · 4 answers · asked by Anonymous in Chemistry

2006-11-04 12:02:06 · 7 answers · asked by Anonymous in Other - Science

show working please

2006-11-04 12:01:13 · 5 answers · asked by Anonymous in Mathematics

explain the difference between weight and mass. gracias. i think this is physics.. not sure though..

2006-11-04 12:00:24 · 12 answers · asked by Anonymous in Physics

a. Cold Water

b. Hot Water

2006-11-04 11:58:15 · 5 answers · asked by Anonymous in Other - Science

5/6 of a number is 3/4. What is the number?

2006-11-04 11:57:23 · 7 answers · asked by Tami C 3 in Mathematics

You drop a 2.00 kg textbook to a friend who stands on the ground 10.0 m below the textbook with outstretched hands 1.50 m above the ground. (a) How much work W^grav is done on the textbook by the gravitational force as it drops to your friend’s hands? (b) What is the change ΔU in the gravitational potential energy of the text book – Earth system during the drop? Of the Gravitational potential energy U of that system is taken to be zero at ground level, what is U when the textbook (c) is released and (d) reaches the hands? Now take U to be 100 J at ground level and again find (e) W^grav (f) ΔU, (g) U at the release point, and (h) U at the hands. Explain your answers and clarify your work. Good Luck!!

2006-11-04 11:55:22 · 2 answers · asked by Anonymous in Physics

in centimeters or millimeter?

2006-11-04 11:54:05 · 2 answers · asked by lisa m 2 in Botany

2006-11-04 11:52:34 · 5 answers · asked by Anonymous in Astronomy & Space

What I have in mind is something roughly analogous to putting a blower on a big block Chevy engine.

2006-11-04 11:51:39 · 4 answers · asked by Anonymous in Astronomy & Space

who is now in danger of losing his tenure because of his scientific investigations into something most other professors disbelieve and to which they object. What happened to the legendary principled open-mindedness of scientists and the scientific method?

See

http://news.yahoo.com/s/ap/20061104/ap_on_sc/professor_bigfoot_7

2006-11-04 11:48:52 · 4 answers · asked by Seeker 4 in Other - Science

2006-11-04 11:47:45 · 6 answers · asked by Cheryl F 1 in Chemistry

I need someone to check and see if I have it right...if not..can you please correct I think i did 7 decimals instead of six. How do you do 6 decimals?

Use the geometric sequence of numbers 1, 1/3, 1/9 , 1/27… to find the following:
a) What is r, the ratio between 2 consecutive terms?
Answer: r = 1/3
Show work in this space. Each term is the previous term divided by 3 or times 1/3

b) Using the formula for the sum of the first n terms of a geometric series, what is the sum of the first 10 terms? Carry all calculations to 6 decimals on all assignments.
Answer: 1.4999745
Show work in this space. S = 1(1 - (1/3)10)/(1 - (1/3)) = (1 - 1/59049)/(2/3) = 1.4999745

c) Using the formula for the sum of the first n terms of a geometric series, what is the sum of the first 12 terms? Carry all calculations to 6 decimals on all assignments.
Answer: 1.4999971
Show work in this space. S = 1(1 - (1/3)12)/(1 - (1/3)) = (1 - 1/531441)/(2/3) = 1.4999971

2006-11-04 11:40:45 · 5 answers · asked by othe1220 1 in Mathematics

a.x 30.
b.x 200.
c.x 300.
d.x 2000.

2006-11-04 11:39:38 · 3 answers · asked by Anonymous in Biology

a.phagocytosis : bacteria
b.cold : hot
c.white blood cell : bacteria
d.pinocytosis : engulfing

2006-11-04 11:38:12 · 2 answers · asked by Anonymous in Botany

2/7 divided by 6

Of course this is a fraction divided by 6. I don't know how to properly make a fraction look like a fraction on this.

2006-11-04 11:37:57 · 7 answers · asked by Tami C 3 in Mathematics

A merry-go-round rotates at the rate of 0.15 rev/s with an 85-kg man standing at a point 2.0 m from the axis of rotation.
(a) What is the new angular speed when the man walks to a point 0.7 m from the center? Assume that the merry-go-round is a solid 25-kg cylinder of radius 2.0 m.
in rad/sec
(b) Calculate the change in kinetic energy due to this movement.
in J

2006-11-04 11:37:20 · 1 answers · asked by activegirl 1 in Physics

a.marker proteins
b.channel proteins
c.receptor proteins
d.superficial proteins

2006-11-04 11:35:53 · 3 answers · asked by Anonymous in Biology

2006-11-04 11:34:12 · 3 answers · asked by DeParris 1 in Mathematics

XeF4 molecule (The central atom is Xe.)


TeF4 molecule (The central atom is Te.)


SeCl2 molecule (The central atom is Se.)

The choices are linear, octahedral, trigonal bipyramidal, tetrahedral and trigonal planar.

Please help..very desperate for this question=)

2006-11-04 11:33:56 · 1 answers · asked by ichigokun 1 in Chemistry

Okay, I have this Extra Credit on my homework, and it's got me really confused. There are these charts where we have to calculate volume (v) and pressure (p). Let me type exactly what's on the paper.

"Using the formula P = V¹P¹/V², calculate the pressure needed to compress the given volume of gas. Complete the chart and graph your results. (V¹ = 4 L, P¹ = 1 kPa)"

Then there's a chart, let me try to type whats on it (it will look weird because I cannot type in chart form.)

Volumes: 3 L, 2 L, 1 L, .5 L, .25 L
Pressure: ?, ?, ?, ?, ?

Okay, all I want to know is how do you figure out those pressures? The worksheet says that that V¹ is 4 L, but then you have to use different volumes. Do I replace V¹ with whatever number they give me. Please help me understand!

2006-11-04 11:32:44 · 4 answers · asked by Jell-O = ♥ 5 in Mathematics

Hey, I know I should be asking professors this and not complete strangers over the internet, but this question is geared more towards actual electrical engineering majors/electrical engineers: I'm getting a minor in physics (major in German) and with that, I really want to go to grad school to study Electrical Engineering. However, one big down side to E.E. is that almost all the info I learn in the major will be obsolete in an X number of years, since new technology is always taking over. So, I ask, is E.E. really worth studying? Don't get me wrong, it's VERY interesting studying analog/digital circuits and devices, but if all my tuition money and studying like a slave to get my master's is going to go towards learning about technology that'll be obsolete and some point, would it still be worth it? What do all you E.E. majors think?

2006-11-04 11:30:44 · 6 answers · asked by DavidausZueri 3 in Engineering