Midterm_1_Phys_8A_Fa_10_Sec_2_DeWeese - University of...

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University of California at Berkeley Department of Physics Physics 8A, Fall 2010 Midterm 1 Oct 7, 2010 You will be given 100 minutes to work this exam. No books are allowed, but you may use a single-sided, handwritten formula sheet no larger than an 8 ½” by 11” sheet of paper. No electronics of any type (cell phones, calculators, etc) are allowed. Your description of the physics involved in a problem is worth significantly more than any numerical answer. Show all work, and take particular care to explain what you are doing. Please use the symbols described in the problems or define any new symbols you use, tell us why you’re writing any new equations, and clearly label any drawings that you make. Write your answers in a blue book, and do not use any extra scratch paper. Here are some formulas you may find useful: v d x / dt a d v / dt 2 0 0 2 1 ) ( t a t v x t x t a v t v 0 ) ( v 2 ( x ) v 0 2 2 ax F m a F mv 2 R F mg P m i v i g = 10 m/s 2 x cm m 1 x 1 m 2 x 2 m 1 m 2 m i x i m i v cm m 1 v 1 m 2 v 2 m 1 m 2 m i v i m i N k fr F F N s fr F F W F x P m v 2 . . 2 1 Av C F R W b l cos a 2 b 2 c 2 2 2 1 mv K gh PE g 2 2 1 kx PE sp R v a 2 sin(45°) = cos(45°) = 0.7 cos(60°) = sin(30°) = 0.5 sin(60°) = cos(30°) = 0.9
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1) (25 points) Pop fly. It’s the bottom of the ninth inning of the Cal-Stanford baseball game—Stanford is at bat and the
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Midterm_1_Phys_8A_Fa_10_Sec_2_DeWeese - University of...

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