russ_watters's latest activity
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All the scenarios are the same, including the original. A string or spring under tension T means each element has a pair of Newtonian... -
Yes. And for those interested about that normal force, it's an upward force exerted on the book by the table, so its 3rd Law partner is...
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russ_watters replied to the thread B Simple mass/scale puzzle.I know it gets more silly the further you take it, but I feel like it could even be better to leave the original scale in place and just...
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russ_watters replied to the thread B Simple mass/scale puzzle.My choice is we don't know what sort of answer would satisfy him, and the answer may be "none". There's some things that just don't...
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russ_watters replied to the thread B Simple mass/scale puzzle.I'm not a physics professor: is the answer the upwards gravitational force the book exerts on the Earth?
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But forces are vectors. That's -100 N on the left and +100 N on the right for a total of 0 N. No surprise there. The rope is not...
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How could there be 81 posts on this?
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I agree, but I find that the free body diagram of the two components of the scale (hook attached to the pointer, case) is how to do that.
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I think you've lost your reason in this thread and should maybe take a break and come back when your head is a bit clearer. How many...
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If the string pulls a mass of 10kg with a force of 200N, then the mass will accelerate against gravity. Not only that, but the force...
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russ_watters replied to the thread B Simple mass/scale puzzle.Because you can't pull on a 10kg weight with 20kg of force and have it remain stationary.
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russ_watters replied to the thread B Simple mass/scale puzzle.I can't speak for physics classes, but that is in fact how it's done in engineering classes: cut the problem up literally and...
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Is that not also true of the two alternate scenarios I described in Post #7? Do you honestly believe that when you hang 3 lb of bananas...
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I don't see it as an alternate explanation. Once you go through the sequence of scenarios associated with each situation shown in the...
