A spring has a force constant k and mass m. The spring hangs vertically and a block of unknown mass is attached to its bottom end. It is known that the mass of the block is much greater than that of the spring. The hanging block stretches the spring twice its relaxed length. How long (t) would it take for a low amplitude transverse pulse to travel the length of the stretched spring -
Text Solution
Verified by ExpertsA
Since mass of spring is small compared to the mass M , the tension force is approximately constant

where
elongation of the spring
given.
where
Relaxed length
mass per unit length
speed of wave 



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