What is psychology?
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love, which can't be observed or measured directly, is an example of a psychological construct.

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

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.

mass and volume are the answers you are looking for