How Can I Solve a Physics Problem with Poor Instruction?

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The discussion revolves around a student struggling with physics due to inadequate instruction from their teacher, who skips explanations and jumps to answers. The student seeks help to solve a specific problem related to calculating current and voltages in a circuit using Kirchhoff's laws. They express confusion over how to apply these laws since their handout lacks examples and detailed methods. A suggestion is made to apply Kirchhoff's laws if the goal is to find the current, indicating that understanding these principles is crucial for solving the problem. Overall, the student is looking for guidance on starting the calculations and understanding the concepts involved.
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Hi I am doing physics. I am totally lost..lol..My teacher is not very good at all and never shows any methods for any calculations, he jumps strait to the answers…. I really need some help with a question, I don’t have a clue as to what method I need to take to solve the question?...is there any chance sum1 can help me as I don’t know where to start with it?...I have set up the question as an attachment and if you could help me I would be VERY grateful….thanks…!
 

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What do you wish to calculate? If it is the current, then if you know Kirchoff's laws, apply them.
 
The question

Find the current flowing and the voltages developed across each of the reistors in the circuit?...ive been given a handout on kirchhoffs laws but it doesn't say how to use them, it doesn't have any examples of how to work them just answers?..im lost..lol
 
what's the resistance at the bottom ?
 
resistance at the bottom is 1
 
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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