PH 125 Midterm: ph125_f14_exam1
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Instructions: solve 3 of 5 problems below. All problems have equal weight: do your work on separate sheets rather than on the exam, do not hesitate to ask if you are unsure what a problem is asking for, 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. Hint: nd the time in terms of the angle and minimize it. On all surfaces (ramp included), the block experiences a coe cient of kinetic friction. If you continue driving at that speed, you"d be there in an hour.
