lane (jbl769) – Reflection 1 – turner – (56910) 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 (part 1 of 9) 10.0 points
What is the difference between a mathe-
matical vector and a VPython Arrow object?
1. 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. correct
2. A mathematical vector always has its tail
at the origin. An arrow object can have its
tail anywhere.
3. The arrow object, when displayed, has a
different length but the same direction as the
mathematical vector.
4. The arrow object, when displayed, has a
different length and a different direction than
the mathematical vector.
5. The arrow object, when displayed, has a
different direction but the same length as the
mathematical vector.
Explanation:
002 (part 2 of 9) 10.0 points
For a VPython Arrow object, what is the
difference between the attributes ’pos’ and
’axis’ ?
1. pos is the unit vector with the same di-
rection as the mathematical vector to be dis-
played; axis is the same as the mathematical
vector to be displayed.
2. pos tells VPython where to locate the
tip of the vector; axis is the same as the
mathematical vector to be displayed.
3. pos is the same as the mathematical vec-
tor to be displayed; axis tells VPython where
to locate the tail of the vector.
4. 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.
5. pos tells VPython where to locate the tail
of the vector; axis is the same as the mathe-
matical vector to be displayed. correct
6. pos is the same as the mathematical vec-
tor to be displayed; axis tells VPython where
to locate the tip of the vector.
Explanation:
003 (part 3 of 9) 10.0 points
Let’s say we want to turn the above diagram
into a VPython scene. You should type in the
correct lines of code for each question as you
go so that you end up with a working program.
Remember to begin every VPython program
with the following two lines:
from future import division
from visual import ∗
First, we will need to define our vectors
A and B. Which two lines of Vpython code
accomplish this?
1.
A= vector(3,0,0)
B= vector(5,2,0)
correct
