Trouble with DC Circuits? Get Help Here!

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The discussion focuses on difficulties with DC circuits, particularly in analyzing series and parallel combinations. The original poster seeks assistance with specific problems and has shared their work for review. Responses indicate that while the approach is generally correct, numerical verification is recommended for accuracy. Suggestions include providing calculations directly in the thread for clarity. Overall, the thread emphasizes the importance of clear communication and verification in solving circuit problems.
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Homework Statement


Hi,
I am having some trouble with DC circuits, especially those that include a combination of series and parallel circuits (networks). There are a couple of problems that I have worked through, but have no idea if I am on the right track and have the correct answers. My work is attached below (the last two attachments are together (question+answer)). Thanks! All help is very much appreciated!

Homework Equations

The Attempt at a Solution

 

Attachments

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The approach is right, I didn't check all numbers in the second problem statement but that is something a calculator can do better anyway.
It would have been easier to follow with the calculations written here in the thread.
 

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Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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Thread 'A cylinder connected to a hanging mass'

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Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
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