Homework Combined - Kapoor (mk9499) homework 01 Turner...

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Unformatted text preview: Kapoor (mk9499) homework 01 Turner (60230) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points At some automobile toll-collecting stations, a thin metal wire sticks up from the road and makes contact with cars before they reach the toll collector. What is the purpose of this wire? 1. To transfer electrons to the automobile 2. To discharge the automobile correct 3. To transfer positive particles to the auto- mobile 4. To warn the drivers 5. To count the vehicles Explanation: Metal wire can conduct net charges to the ground so that it can make the automobile uncharged. 002 10.0 points The five thousand billion freely moving elec- trons in a penny repel one another. Why dont they fly off the penny? 1. The electrons attract each other. 2. They cause a jam when they try to fly away. 3. They dont have enough speed. 4. They are attracted to the five thou- sand billion positively charged protons in the atomic nuclei of atoms in the penny. correct 5. The shell of the penny prevents the elec- trons from flying. Explanation: The electrons are bound to the nuclei. 003 10.0 points How can a charged atom (an ion) attract a neutral atom? 1. The charged atom can emit x rays to induce ionization of the neutral atom. 2. An ion polarizes a nearby neutral atom, so that the part of the atom nearer to the ion acquires a charge opposite to the charge of the ion, and the part of the atom farther from the ion acquires a charge of the same sign as the ion. correct 3. The charged atom can hit the neutral atom and make it positively charged or nega- tively charged. 4. The charged atom can produce secondary electrons to interact with the neutral atom and make it positively charged or negatively charged. Explanation: An ion polarizes a nearby neutral atom, so that the part of the atom nearer to the ion acquires a charge opposite to the charge of the ion, and the part of the atom farther from the ion acquires a charge of the same sign as the ion. 004 10.0 points A particle of mass 62 g and charge 63 C is released from rest when it is 53 cm from a second particle of charge 17 C. Determine the magnitude of the initial ac- celeration of the 62 g particle. Correct answer: 552 . 694 m / s 2 . Explanation: Let : m = 62 g , q = 63 C = 6 . 3 10 5 C , d = 53 cm = 0 . 53 m , Q = 17 C = 1 . 7 10 5 C , and k e = 8 . 9875 10 9 . The force exerted on the particle is F = k e | q 1 | | q 2 | r 2 = m a Kapoor (mk9499) homework 01 Turner (60230) 2 bardbl vectora bardbl = k e bardbl vectorq bardbl bardbl vector Q bardbl m d 2 = k e vextendsingle vextendsingle 6 . 3 10 5 C vextendsingle vextendsingle vextendsingle vextendsingle 1 . 7 10 5 C vextendsingle vextendsingle (0 . 062 kg) (0 . 53 m 2 ) = 552 . 694 m / s 2 ....
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This note was uploaded on 06/28/2009 for the course PHY 303L taught by Professor Turner during the Fall '08 term at University of Texas at Austin.

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Homework Combined - Kapoor (mk9499) homework 01 Turner...

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