Ch 14 HW 3

Ch 14 HW 3 - Ch 14 HW 3 S2009 (Homework) Current Score:...

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Ch 14 HW 3 S2009 (Homework) Current Score: 18/19 Due: Monday, January 26, 2009 12:30 PM EST About this Assignment Extension Requests Question 1 2 3 4 Description Charging and discharging Instructions Reading: Sec 14.5 The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. Question Details All Submissions Notes Question: MI2 14.X.11.01 Question part Submissions 1 2/3 You run your finger along the slick side of a positively charged tape, and then observe that the tape is no longer attracted to your hand. Which of the following are not plausible explanations for this observation? Check all that apply. Sodium ions (Na + ) from the salt water on your skin move onto the tape, leaving the tape with a zero (or very small) net charge. Chloride ions (Cl - ) from the salt water on your skin move onto the tape, leaving the tape with a zero (or very small) net charge. Protons are pulled out of the nuclei of atoms in the tape, and move onto your finger.
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Electrons from the mobile electron sea in your hand move onto the tape, leaving the tape with a zero (or very small) net charge. Solution or Explanation Negatively charged particles must move onto the tape to give it a net charge of zero. Your hand does not have a mobile electron sea (you are not made of metal). It would require a huge amount of energy to pull a proton out of an atomic nucleus. 2. Question Details All Submissions Notes Question: MI2 14.P.70 Question part Submissions 1 2 3 4 1/3 1/3 1/3 1/3 The figures below represent various possible charge distribitions. The diagrams below show a sequence of events involving a small lightweight aluminum ball which is suspended from a cotton thread. In order to get enough information, you will need to read through the entire sequence of events described below before beginning to answer the
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questions. Before trying to select answers, you will need to draw your own diagrams showing the charge state of each object in each situation. A small, lightweight, hollow aluminum ball hangs from a cotton thread. You touch the ball
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Ch 14 HW 3 - Ch 14 HW 3 S2009 (Homework) Current Score:...

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