This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Version One – Homework 1 – Savrasov – 39819 – Mar 29, 2006 1 This printout should have 6 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. The due time is Central time. Force Between Electrons 23:03, trigonometry, numeric, > 1 min, nor mal. 001 (part 1 of 1) 2 points Two electrons in an atom are separated by 1 . 5 × 10 10 m, the typical size of an atom. The Coulomb constant is 9 × 10 9 N · m 2 / C 2 . What is the force between them? Correct answer: 1 . 02679 × 10 8 N. Explanation: Let : d = 1 . 5 × 10 10 m and k e = 9 × 10 9 N · m 2 / C 2 . The force between the electrons is F = k e q 1 q 2 d 2 = k e q 2 e d 2 = 9 × 10 9 N · m 2 / C 2 1 . 5 × 10 10 m 2 × (1 . 60218 × 10 19 C) 2 = 1 . 02679 × 10 8 N . Hanging Charges 02 23:03, calculus, numeric, > 1 min, normal. 002 (part 1 of 1) 2 points Three identical point charges, each of mass 100 g and charge + q , hang from three strings, as in the figure. The acceleration of gravity is 9 . 8 m / s 2 , and the Coulomb constant is 8 . 98755 × 10 9 N · m 2 / C 2 . 9 . 8 m / s 2 1 . 5 c m 100 g + q 1 . 5 c m 100 g + q 45 ◦ 100 g + q If the lengths of the left and right strings are each 10 . 5 cm, and each forms an angle of 45 ◦ with the vertical, determine the value of q . Correct answer: 0 . 693444 μ C. Explanation: Let : θ = 45 ◦ , m = 100 g = 0 . 1 kg , L = 10 . 5 cm = 0 . 105 m , g = 9 . 8 m / s 2 , and k e = 8 . 98755 × 10 9 N · m 2 / C 2 . Newton’s 2nd law: X F = ma. Electrostatic force between point charges q 1 and q 2 separated by a distance r F = k e q 1 q 2 r 2 ....
View
Full
Document
This note was uploaded on 03/24/2011 for the course PHYS 13843 taught by Professor Dr.andygavrin during the Spring '10 term at IUPUI.
 Spring '10
 Dr.AndyGavrin

Click to edit the document details