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

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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,

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## This note was uploaded on 03/10/2010 for the course PHYS 41 taught by Professor Lou during the Fall '09 term at Georgetown KY.

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

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