Finding Current and Voltage Questions?

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The discussion focuses on two electrical circuit questions regarding resistance simplification. For Question 1, participants emphasize the importance of recognizing the connection between nodes c and f to simplify the resistance and find Rab. In Question 2, the term Req is clarified as equivalent resistance, indicating the need to simplify the total resistance from the perspective of the 20V supply. The responses guide the user to understand circuit connections and the implications of equivalent resistance in their calculations. Overall, the conversation aims to assist in solving the circuit problems effectively.
Paymemoney
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Hi
I have two question i am stuck on can someone give me some hints on how would i start it.
The attachment has the problems i am referring to.
View attachment tut1qns.doc

In Question 1 how would you simplify the resistance so you can get Rab?

In Question 2 i have a problem with what exactly does it mean by Req? Does it ask to simplify the resistance?


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Paymemoney said:
Hi
In Question 1 how would you simplify the resistance so you can get Rab?

Pay attention to that sneaky wire going from node c to node f. What does that connection imply about nodes c and f?

In Question 2 i have a problem with what exactly does it mean by Req? Does it ask to simplify the resistance?

Req means equivalent resistance as seen from the point indicated. In this case the bent arrow is meant to imply a vertical slice through the circuit connections at that point. So it looks like they want you to find the total resistance of the whole circuit as seen by the 20V supply.
 
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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