Physics 112
Homework #1
Fall 2005
Read:
Chapter 1, sections 1.1  1.7
For study/discussion:
Chap. 1: Q's #Q1.2, Q1.2, Q1.3, Q1.5, Q1.8, Q1.10, Q1.12, Q1.13,
(not turned in)
Q1.17, Q1.18;
Due Fri., Sept. 2 at lecture:
*** ON EACH HW ASSIGNMENT:
Be sure to show and organize all your work
neatly
for
problems, rather than just giving answers.
Be sure to put on your HW paper:
(1) your
name, (2) your recitation section number, and (3) your recitation instructor's name. ***
#1.10
[Unit Conversions]
Be sure to show your calculations clearly.
#1.12
Be sure to express your answer using the
correct
number of significant digits
, based on the information given.
#1.15
[Measurement Uncertainty]
Please show your reasoning and calculations.
#1.32
[Vectors]
Be sure to draw your vector diagrams carefully with a
ruler
&
protractor
.
1.
The Greek scholar Eratosthenes measured the
circumference of the Earth sometime around the year 230 BC (!).
He used the following
information:
At noon on the first day of summer in the town of Syene (now Aswan) in
Egypt, the Sun was directly overhead in the sky.
At the same time in the town of
Alexandria directly north of Syene, Eratosthenes observed the shadow cast by a vertical stick
in the ground and deduced that the Sun was about 7° away from being directly overhead.
The distance between Alexandria and Syene along the ground had been measured to be
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 Fall '07
 LECLAIR,A
 Algebra, mechanics, Work, Expression, Miles per hour, steady speed

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