A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms:A) Her moment of inertia increases and her angular speed decreasesB) Her moment of inertia decreases and her angular speed decreasesC) Her moment of inertia increases and her angular speed increasesD) Her moment of inertia increases and her angular speed remains the sameE) Her moment of inertia increases and her angular speed increases

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

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i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

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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.