the north-pole end of a bar magnet is held near a stationary positively charged piece of plastic. how is the plastic affected?

explanation:

newton's third law, for every action there is an equal and opposite reaction.

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.

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305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures