In a formal, word-processed paper*, answer as a discussion with full thoughts an

Question

In a formal, word-processed paper*, answer as a discussion with full thoughts and numerical calculations the discussion question listed above about the RTD bus**. Hand this in on paper (with a proper header including what is below) at beginning of next week?s class. Proper Header: Momentum PostLab Name(s) Lab Time: (Day and start time, W8 would be a Wednesday class that starts at 8am) The Header should be in upper left of paper. *The post lab cannot be more than one sheet of paper. You may print two-sided. **your discussion needs to have two major emphases: Your paper needs to address both the Judge (jury) and the Physicist. Treat each separately. 1) The Judge needs terms that are easy to understand. You need to include some ?real world? examples to drive home your answer. The Judge needs to see concepts of momentum exchange and a final answer for change in speed for the bus in mph. 2) The Physicist needs to see calculations for momentum exchange and a final answer for change in velocity for the bus in m/s. Some students will want to address peak force (not required, but interesting.) In order to find peak force we need to know the time of the collision. Do some research to find some values for the time of collisions and calculate max and min force based upon your time range.

Explanation / Answer

Mass of the bus + passengers + fuel = m1 = 66600 lb = 30209.3 kg ; velocity = u1 = 30 mph = 13.41 m/s

Mass of the Van = m2 = 2000 kg ; velocity = u2 = 20 mph = 8.9 m/s

change in velocity of the bus will be given by :

v1 = [u1 ( m1 -m2 ) + 2 m2u2 ] / m1+m2 = [13.41 (30209.3 - 2000) + 2 x 2000 x 8.9] / (30209.3+2000)

v1 = 11.74 m/s

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