Answer to Question 3

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Square the equation:

Therefore:

Now we need to find out the mass per unit length:

m = 1.25 10-3 kg 1.60 m = 7.8125 10-4 kg m-1

 

(a) Now we can work out the tension:

T = 4 7.8125 10-4 kg m-1 (50.0 Hz)2 (1.15 m)2 = 10.3 N

 

(b) v = (10.3 N 7.8125 10-4 kg m-1)0.5 = 115 m s-1