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**Unformatted text preview: **Ch3 HW3 (Homework) Arthur Barfield PHYS 2211, section M, Fall 2008 Instructor: Jennifer Curtis Web Assign Current Score: 24 out of 24 Due: Friday, September 12, 2008 09:00 AM EDT Description Iterative prediction of motion; gravitational force; electric force; reciprocity Instructions Reading: Sec. 3.7-3.12 (and review Sec. 3.4-3.6) The due date for this assignment is past. Your work can be viewed below, but no changes can be made. 1. [MI2 03.P.49] 8/8 points (a) In outer space, far from other objects, block 1 of mass 60 kg is at position < 10 , 8 , 0 > m, and block 2 of mass 1400 kg is at position < 19 , 8 , 0 > m. What is the (vector) gravitational force acting on block 2 due to block 1? It helps to make a sketch of the situation. grav = < -6.948E-8-6.95e-08 , , > N (b) At 4.1 seconds after noon both blocks were at rest at the positions given above. At 4.3 seconds after noon, what is the (vector) momentum of block 2? 1 = < -1.389e-8-1.39e-08 , , > kg · m/s (c) At 4.3 seconds after noon, what is the (vector) momentum of block 1? 2 = < 1.389e-8 1.39e-08 , , > kg · m/s At 4.3 seconds after noon, which one of the following statements is true? Block 1 is moving faster than block 2....

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