Possible variables for Coulombs Law?

AI Thread Summary
Coulomb's Law is expressed as F = K Q1 Q2 / R^2, but solving for both Q1 and Q2 requires additional information since there are two unknowns. The discussion highlights that one cannot isolate two variables with a single equation. If values for F, K, Q1, and R are known, Q2 can be calculated using the rearranged formula Q2 = (F R^2) / (K Q1). The conversation emphasizes the necessity of having more data to solve for both charges independently. Understanding these variables is crucial for applying Coulomb's Law effectively.
Amber Mayson
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COULOMBS LAW
F= K Q1 Q2 / R2

How would I solve for Q1 and Q2?
 
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Hi, :welcome:

This really quantum physics ?

You have one equation for two unknowns ? Not enough !
 
BvU said:
Hi, :welcome:

This really quantum physics ?

You have one equation for two unknowns ? Not enough !

I am not asking for a specific equation to be solved. I am asking if asked to solve for q1 and q2 how would I manipulate this equation?
 
You can not solve for two unknowns if you only have one equation.
 
BvU said:
You can not solve for two unknowns if you only have one equation.

How would I solve for q1 and q2 separately?
 
If you know ##F, k, q_1 ## and ##r## you solve for ##q_2## with ## q_2 = \displaystyle {F r^2 \over k q_1 }##
 
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Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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