Oberlin College Physics 110, Fall 2011
Model Solutions to Assignment 6
HRW problem 15-4: Car on a spring
k
with f = 3.00 Hz and m = 1450 kg/4:
m
a. Use = 2f =
k = m(2f )2 = 1.29 105 N/m.
b. Increase m by (5 73.0 kg)/4:
f=
k
= 2.68 Hz.
m
1
2
HRW problem 15
Oberlin College Physics 110, Fall 2011
Assignment 5
Wednesday, 5 October
Reading: From the Notes on Mechanics and Relativity, read sections 2.8
(The Horse and the Sled), 2.9 (Newtons Third Law), and 2.10 (The Meaning of the Word Force ).
Also read HRW sec
Oberlin College Physics 110, Fall 2011
Model Solutions to Assignment 3
HRW exercise 316: Vector gymnastics
(a) a + b = (8.0 m) + (2.0 m)
i
j
(b) magnitude = (8.0 m)2 + (2.0 m)2 = 8.2 m
(c) angle = arctan(2.0/8.0) = arctan(0.25) = 14.0
(d) b a = (2.0 m) +
Oberlin College Physics 110, Fall 2011
Model Solutions to Assignment 2
HRW problem 26: Bicycle speed record
average speed =
so Hubers speed was
distance traveled
,
time elapsed
200.0 m
= 30.73 m/s = 110.6 km/hr.
6.509 s
Thus Whittinghams speed was
110.6 k
Oberlin College Physics 110, Fall 2011
Assignment 1
Wednesday, 7 September
Reading: By Monday, read the textbook by Halliday, Resnick, and Walker (HRW), chapter 1 (Measurement). Pay particular attention to section 14, and to the sample problems.
By next W
Oberlin College Physics 110, Fall 2011
Assignment 2
Wednesday, 14 September
Reading: Concerning problem solving: From the course website, read the links on Study tips for introductory physics students, Solving problems in physics, and The whys and hows of
Oberlin College Physics 110, Fall 2011
Model Solutions to Assignment 1
Additional problem 1: Weighting light things with a heavy standard
Make a blob of clay that balances the standard.
Cut the clay about in half, then place each portion on the two sides
Oberlin College Physics 110, Fall 2011
Model Solutions to Assignment 4
Additional problem 56: A girl, a sled, and an ice-covered lake
geometry diagram:
girl
rope
sled
shore
ice
free body diagrams:
force on girl by sled
force on sled by girl
force on girl
Oberlin College Physics 110, Fall 2011
Model Solutions to Assignment 7
HRW problem 713: Luge.
Im going to solve this problem in a dierent sequence from the one suggested in the book, because I nd
this sequence easier.
a. F = (85 kg)(2.0 m/s2 ) = 1.7 102 N
Oberlin College Physics 110, Fall 2011
Model Solutions to Sample Exam 1
Additional problem 11: Watersheds.
(a.) The Black River watershed is twice the size of the Vermilion River watershed. The two watersheds are
of similar geological and meteorological c
Oberlin College Physics 110, Fall 2011
Assignment 7
Wednesday, 19 October
Fall break is here at last! I recommend that you relax, avoid your studies,
refresh yourself, and come back invigorated to work on:
Reading: The word power is yet another word that
Oberlin College Physics 110, Fall 2011
Assignment 4
Wednesday, 28 September
Reading: Read HRW chapter 6 (Force and motion, part II), concerning
various kinds of force. This is nice stu and it will clear up several questions
you might have left over from c
Oberlin College Physics 110, Fall 2011
Assignment 3
Wednesday, 21 September
Reading: HRW chapter 5 (Force and motion, part I). This is the most important chapter of the book, and every section demands your careful attention.
Notes for Mondays lecture are
Oberlin College Physics 110, Fall 2011
Final Exam Information
Wednesday, 7 December
Workshops: The WednesdayThursday workshop for this week will be the
free-wheeling lab. There are no pre-lab questions.
Review session: I will hold a conference session in
Oberlin College Physics 110, Fall 2011
Assignment 6
Wednesday, 12 October
Reading: For some necessary mathematical background, read HRW pages 47
to 49 on the scalar dot product (stop at the end of the sample problem on
page 49). But devote most of your eo