Homework Answers
(i).
A seismograph is a Recording type Instrument. It records the movement of the earth due to the earthquakes to a chart paper or Digitally stored in a computer in the case of a Seismometer.
(ii).
The input signal is Vibration Signal and the output is an electrical signal for seismometer and mechanical movement of the marker in the case of a seismograph.
(iii).
Seismograph satisfies Newton's First law of motion, that is nothing but the conservation of momentum. In other words, the pendulum hanged by a string from the base of the seismograph stays still wile base moves due to earthquake because a negligible force is acted upon the pendulum by the string can not move the pendulum very far.
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