Science & Mathematics - 30 August 2007

A 2.2µC point charge is placed in an external uniform electric field of 1.62x104 N/C. At what distance from the charge is the net electric field zero?

2007-08-30 14:51:20 · 2 answers · asked by Anonymous in Physics

A small sphere with a charge of -6.0 10-7 C is placed in a uniform electric field of magnitude 1.2 106 N/C pointing to the west. What is the magnitude and direction of the force on the sphere due to the electric field?

2007-08-30 14:50:05 · 2 answers · asked by Anonymous in Physics

I was reading someones question, and they clame that there is evidence for the red sea parting at http://www.drdino.com/articles.php?spec=50. Can you guys tell me if this is actually true or not? Did they find this?

2007-08-30 14:49:30 · 4 answers · asked by Anonymous in Other - Science

1. y=x³=odd
2. y=x+2=neither
3. y=x²-3=neither
4. y= (1)/(x²-1)=even
5. y= (x)/(x²-1)=even
6. y=X^4=even
7. y=x+x²=odd
8. y=x+x³=odd
9. y=(1)/(x-1)=neither
10. y= (x²)/(x²-1)=even
Please tell me if it is correct or not!

2007-08-30 14:49:00 · 1 answers · asked by iqbalkhanayesha 2 in Mathematics

2007-08-30 14:47:18 · 7 answers · asked by TwiggyRamirez 2 in Physics

A truck covers 45.0 m in 8.00 s while smoothly slowing down to final speed +2.00 m/s.
a. Find its original speed in m/s
b. Find its acceleration in m/s2

2007-08-30 14:46:39 · 2 answers · asked by Anonymous in Physics

x/5 - x/2= 3 + 3x/10

2007-08-30 14:46:20 · 7 answers · asked by :] 3 in Mathematics

Timur Taimazov holds the weightlifting record in the 108 kg weight class, for lifting 946 lbs.

What is his weight in pounds?

How many pounds did he lift, relative to his body?

Thanx to everyone who helps me out. Can you please show the steps to get the answer? Thanx a lot.

2007-08-30 14:45:36 · 6 answers · asked by Anonymous in Mathematics

2007-08-30 14:45:09 · 6 answers · asked by irene r 1 in Mathematics

shooting an arrow than the string in bow B. Which bow gives its arrow a greater acceleration? Explain.

2007-08-30 14:44:47 · 2 answers · asked by Diff 1 in Physics

germination of other seeds?

2007-08-30 14:44:13 · 2 answers · asked by HickityDooDa 2 in Botany

I really need help with this question...

A railway carriage of mass 3.5 x 10^3kg is moving at 4.0m/s on a straight,horizontal track. It collides with a stationary carriage on the same track. As a result of the collision, the two carriages become linked together and move at 2.5m/s. Calculate the mass of the second carriage.

2007-08-30 14:44:03 · 2 answers · asked by Anonymous in Physics

one for example : the Gulf Of Mexico

2007-08-30 14:43:56 · 4 answers · asked by cc 1 in Geography

Can someone please explain to me how I can find the answer to this question?
Thanx.

The body's largest organ is the skin, weighing an average of 2.7 kg.

Convert this to pounds.

What percent of your body weight is that? (for someone weighing 105 pounds.)

2007-08-30 14:42:33 · 3 answers · asked by Anonymous in Biology

I like to core apples before I eat them because it's less messy. Now, does that mean I should buy bigger apples in order to maximize the "edible mass" / dollar ratio? Or it makes no difference?

2007-08-30 14:41:31 · 4 answers · asked by Belzetot 5 in Mathematics

how many significant numbers are there in these numberss?
500
0.06
adn 4050

2007-08-30 14:40:27 · 4 answers · asked by Anonymous in Mathematics

the perimeter of a rectangular playing field measures 504 yards. its length is 6 yards shorter than twice its width. what is its area?

work would be nice plz

2007-08-30 14:39:57 · 3 answers · asked by مدينا Medina ☪ 6 in Mathematics

3/4

-1.1/4
_____ simplify
?????

2007-08-30 14:39:42 · 6 answers · asked by Anonymous in Mathematics

I feel really, really dumb about this question but... can you help me solve these?

Solve for X in the following problems:

3x/ y = 6g/ b

d= t/x

thankyou

2007-08-30 14:39:19 · 1 answers · asked by Midget 2 in Mathematics

the metric system is easier to use than the english systemthat we now use because it is based on multiples of the number?

2007-08-30 14:37:42 · 2 answers · asked by thazlett15727 1 in Mathematics

why is it important that the extinctions occured soon after humans arrived on a new continent? what kind of evidence might a scientist look for to give further proof of this idea?

2007-08-30 14:37:03 · 3 answers · asked by iluvkikyam 2 in Biology

Every other day brian has to take out the garbage. how many days each year does he do this task ? estimate A 180 B 200 C 250 D 365

2007-08-30 14:34:53 · 10 answers · asked by bodigger 1 in Mathematics

Ok, the book tells me the answer is -cos(t-s), but I don't understand how they figured it. I believe it uses implicit differentiation, but I don't know how.

Thanks for your help.

2007-08-30 14:31:26 · 2 answers · asked by Anonymous in Mathematics

i need help LOL whats the percenage for -2/8 and -1.5 and 1 3/4???? I may seem stupid but blame it on SUMMER

2007-08-30 14:29:52 · 11 answers · asked by KC 1 in Mathematics

?????????

2007-08-30 14:29:17 · 2 answers · asked by Anonymous in Zoology

Okay, well, I was assigned a problem on how to solve for instantaneous velocity and I don't know how to do it. I'm in AP Calculus based Physics.

I'm not asking for answers. I just want to know how to get it. I already have the answers but I need to know how to get to that stage.

It goes like this:

The position of a particle moving along the x-axis is given in centimeters by x=9.75+1.50t^3. Consider the time interval between 2 seconds and 3 seconds and calculate (a) the average velocity, (b) the instantaneous velocity at 2s, (c) the instantaneous velocity at 3s, (d) the instantaneous velocity at 2.5s, and the instananeous velocity when the particle is midway between its positions at t=2s and t=3s.

Would you use a limit function? Or dv/dt?

If you use either, how would you solve it?

2007-08-30 14:28:23 · 2 answers · asked by Betty 3 in Physics

Why does an image appear backwards when you look through a microscope? Is the object magnified from UNDERNEATH the object or is it something else? Please help me! Thank You!

2007-08-30 14:28:04 · 1 answers · asked by Anonymous 1 in Biology

yeha i live in mexico and I kinda didnt pay atention to the metric system so can some one tell me whats 6'foot 3 inches into meters and w/e !

2007-08-30 14:24:53 · 2 answers · asked by Anonymous in Mathematics

i need it in less than 10 min hurry up. Thanks

1. How many millilmeters in 1 meter?
2. how many millimeters are in one centimeter?
3. A line 5 cm is how many millimeters long?
4. A lab table is 2 meters long. What is the length in millimeters? In centimeters?

5. A microscope's mass is 1 kilgogram. What is its mass in grams?

6. A chemical's mass is 6 grams, what is its mass in milligrams?

7. Three liters of water contain how many milliliters?

Thanks in advance. I need it fast before 8:50 CST

2007-08-30 14:24:18 · 11 answers · asked by yahoo2000 2 in Mathematics

I asked for help before and it really helped so thank you guys!
I want to see if I did these right:
1) lim x-->-1 (t^2+1)^3*(t+3)^5 and we had to use a limit law and state which one. I used the product rule.
I got: lim x-->-1 (t^2+1)^3 * lim x-->-1 (t+3)^5
= lim x-->-1 (t^2+1) * lim x-->-1 (t^2+1) * lim x-->-1 (t^2+1) * lim x-->-1 (t+3) * lim x-->-1 (t+3) * lim x-->-1 (t+3) * lim x-->-1 (t+3) * lim x-->-1 (t+3)
= (by pluggin in -1 for t) 2*2*2*2*2*2*2*2 = 256

2) lim x-->-1 (x^2+2x+1) / (x^4-1)
= (by factoring) lim x-->-1 (x+1)(x+1) / (x^2-1)(x^2+1)
= Then by factoring (x^2-1) = lim x-->-1 (x+1)(x-1) / (x-1)(x+1)(x^2+1)
= then canceling out the (x+1) from the top and bottom = lim x-->-1 (x+1) / (x-1)(x^2+1)
= (pluggin in -1) lim x-->-1 (x+1) / (x-1)(x^2+1) = (-1)+1 / (-1-1)(-1^2+1) = 0 / (-2)(2) = 0 / -4 = 0

2007-08-30 14:23:46 · 1 answers · asked by Anonymous in Mathematics