# HW4 - Physics 105 Mechanics Fall 2009 Homework 4 Due Friday...

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

Physics 105: Mechanics Fall 2009 Homework 4 Due Friday 9/25 Read sections 3.4-4.4 in the text. Do the following problems. 1. Do 2.P.39. 2. Do 2.P.45. 3. Do 3.RQ.27. 4. Do 3.RQ.28. 5. Do 3.P.40. 6. Two small balls with masses m 1 = m 2 = 2 × 10 - 3 kg have been rubbed with wool. Ball 1 has charge q 1 = - 8 . 0 × 10 - 9 C and is located at ~ r 1 = h 0 . 20 , 0 . 20 , 0 . 00 i m. Ball 2 has charge q 2 = - 5 . 0 × 10 - 9 C and is located at ~ r 2 = h- 0 . 50 , 0 . 30 , 0 . 00 i m. (a) Determine the position of ball 2 relative to ball 1. (Call this ~ r .) (b) Determine the distance between ball 2 and ball 1, | ~ r | . (c) Determine the unit vector ˆ r in the direction of ~ r . (d) Determine the magnitude of the gravitational force exerted on ball 2 by ball 1, | ~ F g 21 | . (e) Determine the gravitational force (vector) exterted on ball 2 by ball 1, ~ F g 21 . (f) Determine the magnitude of the electrical force exterted on ball 2 by ball 1, | ~ F e 21 | . (g) Determine the electrical force (vector) exterted on ball 2 by ball 1,

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.

{[ snackBarMessage ]}

### Page1 / 2

HW4 - Physics 105 Mechanics Fall 2009 Homework 4 Due Friday...

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

View Full Document
Ask a homework question - tutors are online