please explain what this question is asking, and what the answer is and why. i really want to try and understand physics. thanks =)When a 100-N bag of nails hangs motionless from a single vertical strand of rope, how many newtons of tension?
The single strand will have a tension of 100 newtons (100 N). All the weight of the bag must be supported by the strand, and since (presumably) nothing except the bag is tensioning the rope, all 100 newtons of the bag's weight are absorbed by the rope.
With four strands, all we can say for certain is that the sum of strains on the four ropes is 100 newtons. It's possible that the strain is divided exactly evenly among the four strands (at 25 newtons per strand), but that's not necessarily the case -- one strand could be a little slacker or tighter than the others, for instance.When a 100-N bag of nails hangs motionless from a single vertical strand of rope, how many newtons of tension?
that's a poorly worded question. A bag of nails shouldn't be described as a ';100 n bag';. also ';how about if the bag i supported by four vertical strands?'; well... how about that? You need more information to answer it, and saying ';how about'; implies that the previous question can be translated over the the new criteria of having 4 strands, but the previous question asks about ';the strand'; but it's 4 strands now so... whoever wrote these questions is a fool. It's just asking about force. Anyway, you are figuring the tension force. That's the force up and the force down. So with one string you have a tension force of 100 N pulling down from the weight and 100 N from whatever the string is attached to holding the weight up. For the second part, the the weight is distributed evenly then it's 25 N up and down for each strand.
Also I don't know much about physics and I sorta just guessed at what I was writing...
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