Physics II Lab w answers_Part_4

Physics II Lab w answers_Part_4 - II 1 Setup and Procedure...

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19 II. Setup and Procedure: 1. Uncouple the pendulums. Set small oscillations of both pendulums individually. Note the time for 20 oscillations and hence obtain the average time period for free oscillations of the pendulums and the natural frequency ° 0 . 2. Couple the pendulums by hooking the spring at some position to the vertical rods of the pendulums. Ensure that the spring is horizontal and is neither extended nor hanging loose to begin with. 3. Switch on the bulb and observe the spot at the centre of the screen. 4. Excite the first normal mode by displacing both pendulums by the same amount in the same direction. Release both pendulums from rest. The spot on the screen should oscillate in the horizontal direction. 5. Note down the time for 20 oscillations and hence infer the time period T, and frequency ° 1 of the first normal mode. 6. With the spring at the same position excite the second normal mode of oscillation by displacing both pendulums in the opposite directions by the same amount and then releasing them from rest.
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