Nevermind, I figured out myself why my approach was failing. I forgot to consider the perpendicular component of the horizontal component of Earth's magnetic field vector.
The task is to calculate the force acting on a 50 meter long current-carrying wire due to Earth's magnetic field. The angle of inclination is assumed to be 70 degrees. Here's a schematic diagram:
The exaggeratedly drawn wire represents a segment of a wire on a power grid. In order to find...
Hello forum.
So the other day I was pondering properties of atomic nucleus, in particular the property of binding energy (mass defect). Whenever a nucleus -- through a nuclear reaction of some sort -- is split or joined into a more stable nucleus, energy is released. However the newly formed...
You are right, sorry about that; all fixed now!
Ok, I then understand that it is not the net force on the object. I understand that it can have power from the engine but the power from air cannot be a property of the car right? The air does work on the car, so it is the rate of the air which...
Hello forum.
I am finding it hard to wrap my mind around the concept of power when considering forces. We can derive \text{P} = \text{F} \cdot v but what now does the symbol F really signify?
Is it (1) the net force on an object or (2) can we simply put in any force for F acting on an...
Having to test different number of plates in order to see whether the yielded stack-height satisfies the given interval becomes a very tedious task, undeniably so. In the key of the book, they simply form the fraction \frac {0.999}{0.0152} (i.e. they compute the minimal value for x by minimizing...
Note: The language cannot be examined that meticulously due to the fact that I have had it translated. Simply consider it as a very simple problem presented to someone who has never taken physics before i.e. it is not that precise and complicated as some of you are making it (though I appreciate...
Yes and then we establish an interval for x from which we ought to be able to state how many plates certainly will fit (the least value of x in that interval).
Yes an integer indeed, but what do you mean with "probably less than 67"? 67 is the least integral value for x in the established...
Thanks for the replies. I am beginning to view the problem much differently, but let me give you my rendition of this problem. The problem, in its verbatim form, reads:
This is how I approach it: Let x be the number of plates in the stack; this number will have a maximum and minimum value, so...
Yes I understand that we can only have an integral number of wood-plates, but 65.7 is not an upper bound, rather it is a lower bound. Therefore it would not make sense to round down, since 65.7 is the smallest value x – the number of wood-plates – can assume. The first and least integral value...
The wording of the question was something in the lines of
The equivalent question is clearly "what is the least amount of plates one can fit in the stack?", and you can see how I tackled this very question in my previous post. Are my reasonings incorrect or will I have to conclude that the book...