PH 105 Midterm: ph105_sum15_exam1
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Instructions: solve 4 of 6 problems below. Indicate which problems you have chosen: all problems have equal weight, show your work for full credit. A very speedy bird takes o from the rst train and ies at 75 km per hour toward the second train. The bird then immediately turns around and ies back to the rst train. Then he ies back to the second train, and repeats the process over and over as the distance between the trains diminishes, always ying at 75 km/h and only stopping instantaneously. Neglect air resistance: a block is projected up a frictionless inclined plane with an initial speed of vo. One is launched with an angle 1, and the other with a di erent angle 2. Both projectiles have the same range, and will hit the target a distance r away. You may ignore air resistance: a ski jumper leaves the ski track moving in the horizontal direction with a speed of vo.
