What is the total resistance in the given circuit?

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The discussion focuses on calculating the total resistance in a circuit from a homework problem. It notes that in part (a), the circuit is open, resulting in no current flow. For part (b), the total resistance is identified as the sum of 168kΩ and an unknown resistor R2. The user expresses uncertainty about determining the current needed for calculations, indicating a need for examples to clarify the process. Understanding how to find current across the resistor is essential for solving the problem.
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Homework Statement


http://www.ocr.org.uk/Data/publications/past_papers_2005_june/L_AS_Level_Physics_A_2822_Jun_2005_Question_paper.pdf

Question 5


Homework Equations





The Attempt at a Solution



For a) I put that because the circuit isn't closed there's no current.

for b) I can see that the total resistance would be the sum of
168k\Omega + R_2

R = \frac{V}{I}
R = \frac{3.4}{I}

I don't know the current. I'm new to this so I don't really know how to solve. I think an example would help.
 
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You have enough information to get current across the resistor.
 
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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