MIME-Version: 1.0 Content-Location: file:///C:/D9286902/Summer08.Phys1112.Quiz4.SolutionWeb.htm Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="us-ascii" Department of Natural Sciences

 

Clayton State University

Department = of Natural Sciences

 

June 10, 2008=

Physics 111= 2 – Quiz 4

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Name  ___SOLUTION__________________________________

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One of several 10= 0 mF capacitors in defibrillator has a potential difference of 220 V between its plates.

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  1. What is the magnitude of charge on each plate of the capacitor?

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Q =3D = C DV =3D (100 x 10-6 F)(220 V)= =3D 2.20  x 10-2 C =3D 0.0220 C

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  1. What is the energy stored= in the capacitor?

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Est =3D ½ C (DV)2 =3D ½ (100 x 10-6 F) (220 V)2 =3D 2.42 J

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  1. If this energy were fully utilized to lift a 100 g doughnut with no change in its kinetic energy, how high could the doughnut be raised?=

 

 

Est =3D m g Dy

 

Dy =3D Est /(m g)

 

Dy =3D (4.84 J)/[(0.100 kg)(9.81 m/s2 g)] =3D  2.= 47 m