A wire is 4 m long and has a mass 0.2 kg . The wire is kept horizontally. A transverse pulse is generated by plucking one end of the taut (tight) wire. The pulse makes four trips back and forth along the cord in 0.8 sec . The tension in the cord will be

Question

A wire is 4 m long and has a mass 0.2 kg . The wire is kept horizontally. A transverse pulse is generated by plucking one end of the taut (tight) wire. The pulse makes four trips back and forth along the cord in 0.8 sec . The tension in the cord will be, 80 N, 160 N, 240 N, 320 N

MARKS App · Accepted Answer

4 trips means 32 m Wave speed is, v = d t = 32 0.8 = 40 m s - 1 v = T μ Therefore, tension in the cord is, T = μ v 2 T = 0.2 4 × 40 2 = 2 × 16 × 10 4 T = 80 N

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