HW1Problems

# HW1Problems - m C P21-4 What is the repulsive electrical...

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HW 1: CHAPTER 21, QUESTIONS 4, 5, 13 CHAPTER 21, PROBLEMS 2, 4, 7, 8, 10 QUESTIONS : Q21-4) A positively charged rod is brought close to a neutral piece of paper, which it attracts. Draw a diagram showing the separation of charge and explain why attraction occurs. Q21-5) Why does a plastic ruler that has been rubbed with a cloth have the ability to pick up small pieces of paper? Why is this difficult on a humid day? Q21-13) When a charged ruler attracts small pieces of paper, sometimes a piece jumps quickly away after touching the ruler. Explain. PROBLEMS: P21-2) How many electrons make up a charge of -30.0
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Unformatted text preview: m C? P21-4) What is the repulsive electrical force between two protons in a nucleus that are 5.0 x 10-15 m apart from each other? P21-7) Two charged balls are 15.0 cm apart. They are moved, and the force on each of them is found to have tripled. How far apart are they now? P21-8) A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -40 m C. How many excess electrons does this person get, and by how much does her mass increase? P21-10) Particles of charge +70, +48, and -80 m C are placed in a line (Fig. 21-46). Calculate the net force on each charge due to the other two....
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## This note was uploaded on 04/07/2008 for the course PHY 113 taught by Professor Jordan during the Spring '08 term at Rochester.

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