# Coulomb's Law Question

1. Jan 7, 2010

### r1ch412d

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

I have physics homework and i dont quite seem to understand the question:
Two objects ( X and Y ) are placed at a distance of .800m from each other. The charge on X is 6.65000x10^-6 C and Y is 7.73000x10^-6. What is the value of electrical force (in Newtons) between the two objects? Answer accurate to the fourth decimal place.

2. Relevant equations

i think the equation is F=kxQ1xQ2/d^2, but dont know how to solve for Q1 or Q2..and is K 9.0x10^9?
ive tried reading the info. they provide us over and over but still dont seem to get how to solve it
3. The attempt at a solution
thank you

Last edited: Jan 7, 2010
2. Jan 7, 2010

### JaWiB

Q1 and Q2 are the charges on the objects, d is the distance between the objects, and k is Coulomb's constant

3. Jan 7, 2010

### r1ch412d

but the thing is i dont know where to start..

Last edited: Jan 7, 2010
4. Jan 7, 2010

### JaWiB

They give you all of those values, except for k which you can look up. Unless I'm missing something, all you have to do is plug them into the equation to get the force.

5. Jan 7, 2010

### r1ch412d

how do i get values of k, q1, and q2 in units of Coulomb?
oh wait they give it to us in C

6. Jan 7, 2010

### r1ch412d

oh ok..let me try that..ive tried plugging in over and over..but couldnt get the answer..

Last edited: Jan 7, 2010
7. Jan 7, 2010

### r1ch412d

Yes i got it..thanks lol

Last edited: Jan 7, 2010