Question

The force of attraction between two oppositely charged pith balls is 5.3 × 10^-6 newtons. If the charge on the two objects is 6.7 × 10^-9 coulombs, what is the distance between the two charges? (k = 9.0 × 10^9 newton·meter^2/coulombs^2)
Select one of the options below as your answer:

A.
3.0 × 10^-1 meters
B.
7. 0 × 10^-1meters
C.
6.7 × 10^-1 meters
D.
8.2 × 10^-1 meters
E.
9.6 × 10^-1 meters

Answer 1

f=kQq/r*r

Answer 2

how should I put it in for the kQq?

Answer 3

k= 9 x 10^9
q=6.7 x 10^-9=Q

Answer 4

F=9*10^9*10^-9*6.7

Answer 5

idk what im doing i just got 60.3...?

Answer 6

do i divide it by something?

Answer 7

F=9*10^9*(10^-9*6.7)^2/r*r

Answer 8

its a part

Answer 9

@theEric

Answer 10

i edited the problem try it out now

Answer 11

Are pith balls treated as point charges?

Answer 12

columbs law..?

Answer 13

if the distance between the balls is >> the radius of ball...
then the balls are treated as point charges

Answer 14

im about to guess i cant do this

Answer 15

I think all this data is wrong

Answer 16

I did some research and I see what the deal with the pith balls is. And I agree with @souvik . Your class might assume them to be point charges.

Answer 17

i got A as the answer

Answer 18

eric do u agree?

Answer 19

i used coulomb's law

Answer 20

I got close to souvik's answer: 0.27609473353686493820576562279187m.
@souvik , me too! Doing algebra in my head, and using a calculator.

Answer 21

hah Ha... you put all the digits here...:)@theEric

Answer 22

im going with A thankyou

Answer 23

But is the force of attraction negative, in the question?

Answer 24

I don't know if Coulomb's law is the only thing that matters.

Answer 25

thankyou all so much I got a 79% on the test <3

Answer 26

I passed :)

Answer 27

you cheated !!!

Answer 28

yes and no

Answer 29

you would try it yourself

Answer 30

im just getting credit back for scchool cause I got a 58% 2nd semester

Answer 31

I have an ap student sitting next to me he was having trouble on alot of my questions too

Answer 32

Yes, only if you stole the answers. No, if you did everything yourself. It is apparent that you took a test that allowed you internet freedom and time. Hopefully it did not forbid learning during the test (like and open-book test). If it did... shame on you... Otherwise, you did not cheat if you used only study tools, and not direct answers. I understand that the situation probably motivated you to use others' answers, but I hope you did not. The test should reflect your ability at the time of taking the test.

As always, I really hope that you did not cheat, and I hope I didn't give too much away.

Answer 33

What I do, when I have to learn for a question, is ask to understand the material. If possible, I'd work a related question! Good luck! I'm glad you finished! Now you can relax!

Answer 34

dude no I didnt really cheat I worked problems out myself if I was struggling and cant figure it out ill ahve people suggest answers desnt mean I just go a click that answer I make sure it right

Answer 35

and thanks

Answer 36

There you go! If it's your knowledge, then that's not cheating. I think us putting direct input into the question is cheating a little, but you're right - you do the evaluating, and the learning. Still, I hope you could get the same grade or better! But I know how the school system is, and I know it's hard to learn about something you want to avoid! That's a pitfall of the system.

Answer 37

Put it this way, If I tried something like this at my university, I'd be expelled on the spot.

Answer 38

Keep in mind, this isn't the only question he (or she) posted.

Answer 39

That might be fair. Some schools have official guidelines laid out to define academic dishonesty. Professor's can lay out rules as well, as allowed by the guidelines if there are any. At any rate, I hope everything is okay.

Answer 40

This is all definitely something to consider the next time!