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1) A 15m rope is tensioned by a force of 135N. When a transverse pulse is produced at the end of the rope, it takes 

1) A 15m rope is tensioned by a force of 135N. 
When a transverse pulse is produced at the end of the rope, it takes 0.40 s before the pulse reaches the other end. 
What is the mass of the rope? 
How long will the pulse be on the way when the span is halved?

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