1. When a rubber balloon is rubbed with fur, the fur loses approximately one billion (10⁹) molecules. Each molecule has a net charge of -e. So, in the electric world, each molecule behaves like an electron. They are electrically equivalent. Assume both the fur and balloon start neutral. (a) What is the net charge on the fur? The sign is important. (b) The billion molecules are not "lost" but are deposited on the balloon. What is the net charge on the balloon? The sign is important. (c) Would you expect the fur and rubber to attract, repel, or do neither?

1. When a rubber balloon is rubbed with fur, the fur loses approximately one billion (10⁹) molecules. Each molecule has a net charge of -e. So, in the electric world, each molecule behaves like an electron. They are electrically equivalent. Assume both the fur and balloon start neutral. (a) What is the net charge on the fur? The sign is important. (b) The billion molecules are not "lost" but are deposited on the balloon. What is the net charge on the balloon? The sign is important. (c) Would you expect the fur and rubber to attract, repel, or do neither?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

1. When a rubber balloon is rubbed with fur, the fur loses approximately one billion (10⁹)
molecules. Each molecule has a net charge of -e. So, in the electric world, each molecule
behaves like an electron. They are electrically equivalent. Assume both the fur and balloon
start neutral.
(a) What is the net charge on the fur? The sign is important.
(b) The billion molecules are not "lost" but are deposited on the balloon. What is the net
charge on the balloon? The sign is important.
(c) Would you expect the fur and rubber to attract, repel, or do neither?

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A rubber rod is rubbed with a piece of fur and, as a result, the rubber rod has a negative charge. What happened? O Protons were removed from the rod. O The fur became negatively charged. O Electrons were added to the rod. O The fur was left neutral.
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Ch 18 q3 In 1910 Rutherford performed a classic experiment in which he directed a beam of alpha particles at a thin gold foil. He unexpectedly observed a few of the particles scattered almost directly backward. This result was not consistent with then current models of atomic structure and led Rutherford to propose the existence of a very dense concentration of positive charge at the center of an atom—the atomic nucleus. The alpha particle has a charge of +2e and the gold nucleus a charge of +79e. Suppose that an alpha particle is initially a great distance from the gold, has a kinetic energy of 4.20 MeV (4.20 106 eV), and is headed directly at a gold nucleus. How close will the particle come to the center of the nucleus? Treat the nucleus and the alpha particle as point charges.
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