Physical Sciences 2
Sept. 1924, 2013
Homework #3: FANCLAN, Friction, Drag
Answer Key (10 points total)
1. Iris and Javier (2 pts) Iris and Javier are playing on a playground rather than
studying for their physics exam.
Iris: Its your turn to sit on the me

Physical Sciences 2
Sept. 1924, 2013
Physical Sciences 2: Assignments for Sep. 1924
Homework #3: FANCLAN, Friction and Drag
Due Tuesday, Oct 1, at 9:30am
Homework Assignment:
Answers to the following questions must be turned in to your TFs mailbox by 9:30

Physical Sciences 2
Sept. 510, 2013
Homework #1: Momentum, Interactions, Center of Mass
1. Momentum transfer (2 pts). We claim that momentum is conserved. However, in the
following scenarios, an objects momentum apparently changes. Explain, in each case,

Physical Sciences 2
Nov. 21 Dec. 3
Homework #10: Statistical Mechanics, Brownian Motion, and Diffusion
Total Points: 20
1. Two-state molecule (3 pts). A certain molecule can exist in two states: the ground
state, which has U = 0, and the excited state, wh

Physical Sciences 2
Oct. 17 22, 2013
Homework #6: Static Equilibrium and Simple Harmonic Motion
Answer Key TOTAL POINTS: 10
1. My aching back! (3 pts) When you bend over at the waist, large forces are exerted on
the discs between your vertebrae. In partic

Physical Sciences 2
Sept. 3, 2013
Physical Sciences 2: Offline Assignment for Sept. 3
Homework #0: Vectors, Position, and Velocity
Due Tuesday, Sept. 10, at 9:30am
This assignment must be turned in by 9:30 am on Tuesday, Sept. 10. Late homework will not b

Physical Sciences 2
Sept. 17, 2013
Physical Sciences 2: Assignments for Sept. 1217
Homework #1: Momentum, Interactions, Center of Mass
Due Tuesday, Sept. 17, at 9:30am
Homework Assignment:
Answers to the following questions must be turned in to your TFs m

Physical Sciences 2
Sept. 1217
Physical Sciences 2: Assignments for Sept. 1217
Homework #2: Forces and Kinematics
Due Tuesday, Sept. 24, at 9:30am
Homework Assignment:
Answers to the following questions must be turned in to your TFs mailbox by 9:30am
on T

Physical Sciences 2
Nov. 21 Dec. 3
Physical Sciences 2: Assignments for Nov. 21 Dec. 3
Homework #10: Statistical Mechanics, Brownian Motion, and Diffusion
You do not have to turn this in! Please feel free to drop by the PS2 Help Room on
Fridays 2-5PM and

Re
V l
Lecture 19: High Reynolds Number
Fluid Flow
Today and next lecture: Kesten/Tauck Ch. 11
11/7/2013
Background: Laminar versus turbulent flows
Qualitatively, fluid motions
come in two types
Laminar: Regular flow
with motion of smooth
lamina or shee

Hi(ng a Baseball
A 150-g baseball moving at a speed of 90
mph (40 m/s) is struck by a bat. During the
bat-ball collision, the x-component of the
force exerted on the ball along its direcIon
of moIon is shown

Hi(ng a Baseball
A 150-g baseball moving at a speed of 90
mph (40 m/s) is struck by a bat. During the
bat-ball collision, the x-component of the
force exerted on the ball along its direcIon
of moIon is shown

Curling
The red teams curling stone has an ini8al speed of v1i when it strikes the yellow
teams stone that is ini8ally at rest. The red stone deviates by 60 from its original
direc8on, and the yellow stone moves o

Curling
The red teams curling stone has an ini8al speed of v1i when it strikes the yellow
teams stone that is ini8ally at rest. The red stone deviates by 60 from its original
direc8on, and the yellow stone moves o

Granny goes for a ride
Your grandmother, with mass mg, is
seated in a wheelchair of mass mc. You
push the wheelchair horizontally with
a constant force of magnitude Fpush
and your grandmother and the
wheelchair ac

Granny goes on yet another ride
Your 70-kg grandmother decides to take up extreme
skydiving. With prac<ce, she can streamline her cross-
sec<onal area to about 0.6 m2, reaching a terminal
speed of 77 m/s (~170 mph).

Granny goes for a ride
Your grandmother, with mass mg, is
seated in a wheelchair of mass mc. You
push the wheelchair horizontally with
a constant force of magnitude Fpush
and your grandmother and the
wheelchair ac

Granny goes on yet another ride
Your 70-kg grandmother decides to take up extreme
skydiving. With prac<ce, she can streamline her cross-
sec<onal area to about 0.6 m2, reaching a terminal
speed of 77 m/s (~170 mph).

Granny goes for another ride
You take your grandmother to the
amusement park, where the two of
you ride the Gravitron.
Why dont you fall down?
Granny goes for another ride (cont.)
If the radius of the room is

Review 4 Energy and Work
September 26 October 3, 2013
Beatriz E Burrola Gabilondo
Energy
Dimensions:
KineQcEnergy of moQon
SI Units: Joules (J) =
PotenQalEnergy of posiQon
GravitaQonal El

Granny goes for another ride
You take your grandmother to the
amusement park, where the two of
you ride the Gravitron.
Why dont you fall down?
Granny goes for another ride (cont.)
If the radius of the room is

Review 4 Energy and Work
September 26 October 3, 2013
Beatriz E Burrola Gabilondo
Energy
Dimensions:
KineQcEnergy of moQon
SI Units: Joules (J) =
PotenQalEnergy of posiQon
GravitaQonal El

Kick it!
Your 1.5-kg physics textbook is at rest on the ground. You
run up and kick it, giving it a velocity of 10 m/s at 45
angle above the horizontal. When the book reaches its
maximum height of 2m, its horiz

Review 1: Mementum and
Center of Mass
September 5—10, 2013
Beatriz E Burrola Gabilondo _J Momentumwﬂkm)
' Deﬁnition : m \1 ._ "
_ ImenSIons ﬂ (mteCQCﬂUOS
—S|units KCj -
° ConseQ/ation of {m @svgiemx
._l
3&0,§:%
—Deﬁneasystem:)Wiq€gQ 6 +h€ Q-Q Raﬁ 7
w u I

9/20/13
Review 2: Forces and Kinema8cs
Sept. 1217, 2013
Beatriz E Burrola Gabilondo
Forces and Momentum
See change in momentum! Conclude:
Net force
Is a vector
Dimensions
SI Units
Interac8ons
C