PhyIIHW3 - hopkins (tlh982) – HW03 – criss – (4908) 1...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: hopkins (tlh982) – HW03 – criss – (4908) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points An uncharged molecule of DNA (deoxyri- bonucleic acid) is 2 . 17 μ m long. The ends of the molecule become singly ionized so that there is a charge of- 1 . 6 × 10 − 19 C on one end and +1 . 6 × 10 − 19 C on the other. The heli- cal molecule acts like a spring and compresses 1 . 2% upon becoming charged. The value of Coulomb’s constant is 8 . 98755 × 10 9 N · m 2 / C 2 and the acceleration due to gravity is 9 . 8 m / s 2 . Find the effective spring constant of the molecule. Answer in units of N / m. 002 (part 1 of 2) 10.0 points Three positive point charges are arranged in a triangular pattern in a plane, as shown below. The Coulomb constant is 8 . 98755 × 10 9 N · m 2 / C 2 . + 2 nC + 5 nC + 7 nC 2m 2m 2 m Find the magnitude of the net electric force on the 5 nC charge. Answer in units of N. 003 (part 2 of 2) 10.0 points b) What is the direction of this force (as an angle between- 180 ◦ and 180 ◦ measured from the positive x-axis, with counterclock- wise positive)? Answer in units of ◦ . 004 (part 1 of 3) 10.0 points Three charges are located on a horizontal axis. 13 μ C- . 7 μ C 13 μ C p 1 . 7352 m 2 . 5 m 2 . 5 m Let up be the positive direction. The Coul- omb constant is 8 . 98755 × 10 9 N · m 2 / C 2 ....
View Full Document

This note was uploaded on 09/03/2009 for the course PHY PHY 2049 taught by Professor Robertr.criss during the Fall '08 term at University of South Florida.

Page1 / 3

PhyIIHW3 - hopkins (tlh982) – HW03 – criss – (4908) 1...

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

View Full Document Right Arrow Icon
Ask a homework question - tutors are online