Which two states are almost entirely within areas that get less than 4.0 kWh/m2/day of sunlight?
A. Pennsylvania (PA)
O B. Colorado (CO)
C. New Mexico (NM)
D. New York (NY)
E PREVIOUS
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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