question_answer 1)

A string of mass 2.50 kg is under a tension of 200 N. The length of the stretched string is 20.0 m. .K the transverse jerk is struck at one end of the string, how long does the disturbance take to reach the other end ?

Answer:

(a) It is not a periodic motion. Though the motion of a swimmer is to and fro but will not have a definite period. (b) It is a periodic motion because a freely suspended magnet if once displaced from N-S direction and let go, it oscillates about this position. Hence it is simple harmonic motion also. (c) It is also a periodic motion, (d) It is not a periodic motion.