Give the reason for following questions. (i) The motion of an artificial satellite around the earth cannot be taken as SHM. (ii) A passing aeroplane sometimes causes the rattling of the windows of house. (iii) The time period of a simple pendulum will get doubled if its length is increased four times.

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(i) simple harmonic motion is a type of periodic motion where restoring force acts in the direction opposite to displacement and is directly proportinal to it. e g motion of a spring. In motion of a satellite neither the force is opposite to displacement nor it is directly proportional to it. It is...
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(i) simple harmonic motion is a type of periodic motion where restoring force acts in the direction opposite to displacement and is directly proportinal to it. e g motion of a spring. In motion of a satellite neither the force is opposite to displacement nor it is directly proportional to it. It is just a type of periodic motion. (ii) when a aeroplane engine runs, it generates sound in various frequencies. Every matter in the world has a natural frequency of vibration of its own. when the frequency of sound produced matches the natural frequency of vibration, it causes resonance and vibration with a larger amplitude. this causes rattling sound of windows. (iii) time period of simple pendulum is directly proportional to square root of the length. so if length quadraples time period doubles. read less
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