Question

One end of a string of length
L=15m is tied to the ceiling
of an elevator accelerating
upwards with an
acceleration 20ms. The
other end of the string is
free. The linear mass density
of string varies linearly from
0 to 2, from bottom to top.
Find the time taken by a
pulse (in seconds) to reach
from bottom to the top
(g=10ms)​

Answer 1

Answer:

The acceleration of string in ground frame will be 3g. Now, draw fbd of piece of string that is x units long from the bottom. Let tension at this distance be T.

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