Answer:
136.27 N
Explanation:
From the question,
The velocity of the pulse is given as
v = L/t................. Equation 1
Where v = velocity of the pulse, L = total length of the pulse, t = time.
Given: L = 4×2×6.48 (as the pulse makes four tips down and back) = 51.84 m, t = 0.877 s.
substitute into equation 1
v = 51.84/0.877
v = 59.11 m/s.
Using,
But,
v = √(T/m')................... Equation 2
Where T tension in the cord, m' = mass per unit length of the cord.
make T the subject of the equation
T = v²m'.................... Equation 3
Given: v = 59.11 m/s, m' = 0.253/6.48 = 0.039 kg/m
Substitute into equation 3
T = 59.11²(0.039)
T = 136.27 N
Hence the tension in the cord = 136.27 N
