Simple physics question

Guest · Post by **Guest** » Thu May 19, 2005 10:15 pm

Coulomb's law and newton's law of gravitation both involve which of the following?

A) the mass of the particle
B) the charge on the particle
C) permeability
D) permittivity
E) the inverse-square law

Post by **LeonardoP** » Thu May 19, 2005 10:17 pm

gimme the formulas and ill sort you out :icon14:

Guest · Post by **Guest** » Thu May 19, 2005 10:21 pm

ok

coulomb's law: F=k((Q1)(Q2)/r²)
newton's law of gravitation: F=G((M1)(M2)/r²)

Post by **LeonardoP** » Thu May 19, 2005 10:27 pm

whats the k stand for? and the radius of what is used? lol i forgot almost everything.

also whats permeability and permitivity mean?

Post by **mjrpes** » Thu May 19, 2005 10:28 pm

The answer is E (yes, this is a guess)

Post by **saturn** » Thu May 19, 2005 10:29 pm

yeah, it's E

Post by **LeonardoP** » Thu May 19, 2005 10:33 pm

ow theres just one answer. forgot what the inverse square law was but i checked it out, and yeah they're right (obviously)

Guest · Post by **Guest** » Thu May 19, 2005 10:38 pm

Looks like thats right. I didn't know there was an official "inverse square law"

http://hyperphysics.phy-astr.gsu.edu/hb ... s/isq.html

Guest · Post by **Guest** » Thu May 19, 2005 10:39 pm

Btw, permeability applies to gravity and permittivity applies to electric charge.

Post by **MKJ** » Fri May 20, 2005 8:41 am

HOMEW3RKWORLD
...your grades are waiting...

Post by **Nightshade** » Fri May 20, 2005 11:28 am

ToxicBug wrote:Btw, permeability applies to magnetic materials and permittivity applies to dielectrics.

Guest · Post by **Guest** » Fri May 20, 2005 11:35 am

Yea, I've learned that after a quick google