PHYS 2101 Midterm: PHYS 2101 LSU 2007f 1
Document Summary
We will show the correct answers at the end of the exam, so you can know the grade you will receive: feel free to detach, use and keep the formula sheet. No other reference material is allowed during the exam: you may use scienti c or graphing calculators. 1: consider two vectors, ~a = (2m) i + (6m) j (3m) k, and ~b = (4m) i + (2m) j + (1m) k. The product ~a ~b is (a) (8m) i + (12m) j (3m) k (b) (12m) i (14m) j (20m) k (c) 23m2 (d) 17m2 (e) none of these. The scalar product is ~a ~b = axbx + ayby + azbz = (2m)(4m) + (6m)(2m) + ( 3m)(1m) = 8m2 + 12m2: the value of i ( j k) is: 3m2 = 17m2. (a) 0 (b) +1 = (c) 1 (d) 3 (e) 3.
