solution4_pdf

solution4_pdf - taherisefat(mt23852 – hw 4 – Opyrchal...

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
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: taherisefat (mt23852) – hw 4 – Opyrchal – (121012) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Two charges are located along the x-axis. One has a charge of 6 . 5 μ C, and the second has a charge of − 3 . 5 μ C. The Coulomb constant is k e = 8 . 98755 × 10 9 N m 2 / C 2 . The acceleration of gravity is 9 . 81 m / s 2 . If the electrical potential energy associated with the pair of charges is − 5 . 5 × 10- 2 J, what is the distance between the charges? Correct answer: 3 . 71859 m. Explanation: Let : q 1 = 6 . 5 μ C , q 2 = − 3 . 5 μ C , U electric = − 5 . 5 × 10- 2 J , and k e = 8 . 99 × 10 9 N · m 2 / C 2 . U electric = k e q 1 q 2 r r = k e q 1 q 2 U electric = (8 . 99 × 10 9 N · m 2 / C 2 ) × (6 . 5 × 10- 6 C)( − 3 . 5 × 10- 6 C) − 5 . 5 × 10- 2 J = 3 . 71859 m . 002 (part 1 of 2) 10.0 points An object with a charge 9 C and a mass . 2 kg accelerates from rest to a speed of 23 m / s. Calculate the kinetic energy gained. Correct answer: 52 . 9 J. Explanation: Let : m = 0 . 2 kg and v = 23 m / s . The kinetic energy is K = 1 2 mv 2 = 1 2 (0 . 2 kg) (23 m / s) 2 = 52 . 9 J . 003 (part 2 of 2) 10.0 points Through how large a potential difference did the object fall? Correct answer: 5 . 87778 V. Explanation: Let : q = 9 C . The potential difference is Δ V = K q = 52 . 9 J 9 C = 5 . 87778 V . 004 10.0 points A uniform electric field of magnitude 365 V / m is directed in the positive x-direction. Sup- pose a 20 μ C charge moves from the origin to point A at the coordinates, (32 cm, 58 cm)....
View Full Document

This note was uploaded on 01/31/2011 for the course PHYS 111 taught by Professor Moro during the Spring '08 term at NJIT.

Page1 / 4

solution4_pdf - taherisefat(mt23852 – hw 4 – Opyrchal...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online