Conserva)on of Momentum
Lecturer: Merideth Frey
(mafrey@wesleyan.edu)
PHYS 111
1
October 16th Lecture
RECALL: some useful things about
momentum
The impulse equa)on holds
for any system comprised
of any number of p
Homework #3
Due in class on Monday, September 23rd
PHYS 111
1. Spider-Man Physics I
For the situations below, draw a complete free-body diagram for the object and then draw the direction of the net force. Dont worry if you
dont have a name for some of the
Elas%c and Inelas%c Collisions
Lecturer: Merideth Frey
(mafrey@wesleyan.edu)
PHYS 111
1
October 18th Lecture
A person aIempts to knock over a heavy bowling
pin by throwing a ball at it. The person has two balls
o
Midterm #2 Review Session
Results from Mid-Semester Survey
~60% do reading before class and nd the
reading quizzes useful to direct their reading
~75% check Piazza and nd it useful
~65% aGend help sessions/oce hou
Physics 111, Exam 1 Name:_ C;£:7/
10/5/01
.____..--""
Remember units.
1. In a drag race, a car accelerates constantl
y from rest,
traveling 120 meters in 8 seconds;
Find its
. ,r a
a. average speed c b. acceleration :B-WSWV
U)
;
nizé-ai
CHAPTER ELEVEN SOLUTIONS
If half of this goes into heat, Q=2-g--52l 2 112.5 J, and
___Q__ , 112.5 1 _ ,
"1116 (5.00 x 10-3 kg)(128 J/kg°C) "176 C'
Q 1674 I a
_ _ a]: 74 = = =
11 6 Q400c 16 J.soAT C (5.00 x 102 kgxzso J/kgoc) 146 C,
and Tf=166C.
1 1
Homework #4
Due in class on Monday, September 30th
PHYS 111
1. Forces on a Box The table below provides information about the motion of a box in four dierent situations. In each case, complete the table
by lling in the information that has been omitted. C
Homework #1
Due in class on Monday, September 9th
PHYS 111
1. Velocity from Position vs. Time Graph The position versus time
graph shown below represents the motion of an object moving in a
straight line.
(a) Describe the motion.
(b) During which periods
Homework #7
Due in class on Monday, November 4th
PHYS 111
1. Calculating Angular and Tangential Velocities
(a) Whatis the angular velocity and tangential velocity of the earth going
around the sun?
(b) What is the angular velocity and tangential velocity
Homework #9
Due in class on Monday, November 18th
PHYS 111
1. Static Equilibrium while Camping
Giancoli, Chapter 9, Problem 8 - The two trees in Fig. 9-51 are 6.6 m
apart. A backpacker is trying to life his pack out of the reach of bears.
Calculate the ma
Homework #5
Due in class on Monday, October 14th
PHYS 111
1. Work on a Ramp A block is launched with initial speed v0 up a frictionless ramp with total vertical height H and an angle from the horizontal.
(a) List the forces exerted on the block as it move
Homework #6
Due in class on WEDNESDAY, October 23rd
PHYS 111
1. Space Walk Giancoli, Chapter 7, Problem 19 - A 125-kg astronaut (including space suit) acquires a speed of 2.50 m/s by pushing o with her
legs from a 1900-kg space capsule.
(a) What is the ch
Homework #2
Due in class on Monday, September 16th
PHYS 111
1. Practice with Freefall Giancoli, Chapter 2, Problem 54 - A rock is
dropped from a sea cli, and the sound of it striking the ocean is heard
3.4 s later. If the speed of sound is 340 m/s, how hi
CHAPTEB TEN SOLUTIONS
CHAPTER TEN SOLUTIONS
Chapter Ten Readings
Berry, R.S., "When the Melting and Freezing Points are not the Same,"
Scientic American, August 1990, p.68.
Greenslade, T.B., "The Maximum Density of Water," The Physics Teacher,
Novembe