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Reflection 1-problems

# Reflection 1-problems - louey(cal2859 Reflection 1...

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louey (cal2859) – Reflection 1 – florin – (56930) 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001(part1of9)10.0points What is the difference between a mathe- matical vector and a VPython Arrow object? 1. A mathematical vector always has its tail at the origin. An arrow object can have its tail anywhere. 2. The arrow object, when displayed, has a different length but the same direction as the mathematical vector. 3. The arrow object, when displayed, has a different length and a different direction than the mathematical vector. 4. The arrow object, when displayed, has a different direction but the same length as the mathematical vector. 5. A mathematical vector can have its tail located at any point. An arrow object must choose a particular point for the tail in order to display the vector. 002(part2of9)10.0points For a VPython Arrow object, what is the difference between the attributes ’pos’ and ’axis’? 1. pos is the same as the mathematical vec- tor to be displayed; axis tells VPython where to locate the tail of the vector. 2. pos is the same as the mathematical vec- tor to be displayed; axis is the unit vector with the same direction as the mathematical vector to be displayed.

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