To understand the interplay of observations and models you must first be able to distinguish between things that we observe and things that we infer from models. consider the following statements about the sun. classify each statement as an observation or as an inference based on the current, accepted model for the sun.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

i don't understand. explain it clearly

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