핵심물리학2 전기파트 20단원 레포트답안

핵심물리학2 전기파트 20단원 레포트답안

핵심물리학2 전기파트 20단원 레포트답안.doc

본문 EXERCISES Section 20.1 Electric Charge 14. Nearly all of the mass of an atom is in its nucleus, and about one half of the nuclear mass of the light elements in living matter (H, O, N, and C) is protons. Thus, the number of protons in a 65 kg average-sized person is approximately which is also the number of electrons, since an average person is electrically neutral. If there were a charge imbalance of a person's net charge would be about or several coulombs (huge by ordinary standards). 15. INTERPRET This problem deals with quantity of charge in a typical lightning flash. We want to express the quantity in terms of elementary charge e. DEVELOP Since the magnitude of elementary charge e is the number of electrons involved is given by EVALUATE Substituting the values given in the problem statement, we find the number to be ASSESS Since 1 coulomb is about elementary charges, our result has the right order of magnitude. 16. (a) The proton's charge is corresponding to a combination of uud quarks; (b) for neutrons, corresponds to udd. (See Chapter 39, or Chapter 45 in the extended version of the text.) Section 20.2 Coulomb's Law 17. INTERPRET In this problem we are asked to compare the gravitational and electrical forces between a proton and an electron. DEVELOP The gravitational force and the electrostatic force between a proton and an electron separated by a distance r are, respectively, and EVALUATE The ratio of the two forces is Note that the spatial dependence of both forces is the same, and cancels out. ASSESS At all distances (for which the particles can be regarded as classical point charges), the Coulomb force is about times stronger than the gravitational force. 하고 싶은 말 좀 더 업그레이드하여 자료를 보완하여, 과제물을 꼼꼼하게 정성을 들어 작성했습니다. 위 자료 요약정리 잘되어 있으니 잘 참고하시어 학업에 나날이 발전이 있기를 기원합니다 ^^ 구입자 분의 앞날에 항상 무궁한 발전과 행복과 행운이 깃들기를 홧팅 키워드 단원, 핵심, 레포트답안, 전기파트, 핵심물리학, 물리학