A30 g string is under 17 n of tension. a pulse travels the length of the string in 40 ms . how long is the string?
express your answer to two significant figures and include the appropriate units.

length of the string, l = 0.91 m = 91 cm

Given:

mass of string, M = 30 g =0.03 kg

Tension in string, T = 17 N

time taken for the pulse to travel, t = 40 ms = 0.04 s

Solution:

velocity of the pulse, v =             (1)

Also, v =                             (2)

From eqn (1) and (2):

Squaring both the sides of the above eqn, re-arrngingig and solving for length, l:

length, l = 0.91 = 91 cm

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