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Physics 207, Fall 2008
1
Cornell University
Assignment 2
Concepts:
motion with constant acceleration
free fall
proportional reasoning
dimensional analysis
vectors and scalars
addition and subtraction of vectors
components of vectors and unit vectors
r
r
,
v
r
, and
a
r
Reading in text:
Chapter 2: Sections 110; Chapter 3: Sections 16; Chapter 4: 16
Assignment:
Due in lecture on Wednesday, September 10.
Please turn in this sheet stapled to the top of your work.
A.
OnLine Math WarmUp Problems:
If you'd like some practice with the math skills relevant to the
work we're doing this week and next,
please go to
www.blackboard.cornell.edu
, log in to the Physics 207
Math Review website, and then do the Unit Tests on Triangles and Vectors, Proportions and Sines and Cosines
1.
You can attempt the tests as many times as you like.
B. Physics Problems:
1. A CRJ100 jet plane needs to reach a speed of 360 km/h for takeoff, and requires a
minimum runway length for takeoff of 1.8 km.
(a) What is the smallest (constant) acceleration (in m/s
2
) needed for a 1.8 km long runway?
What fraction of the magnitude of the acceleration due to gravity,
g
, is this?
(Is your
answer consistent with your feeling of being pushed into your seat during takeoff?)
(b) How long does this takeoff last?
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 Fall '07
 LIEPE, M
 Physics, Acceleration, partner, Cornell University, km long runway

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