Physical Sciences 2
2013
Homework #0: Introduction, Vectors, Velocity
Answer Key
Grading Scale: Each part of a question (a, b, c, etc.) is worth 1 point:
+1 if it is completely correct (including units!) or if there are some small errors
0 if it was not s

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
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. 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. 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

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

Merry-go-round
You sit on a merry-go-round at rest. Your friend pushes the merry-go-round with
constant angular accelera9on, un9l it is spinning at 10rpm. The radius of the merry-
go-round is R = 2m.
a) If the dura

Merry-go-round
You sit on a merry-go-round at rest. Your friend pushes the merry-go-round with
constant angular accelera9on, un9l it is spinning at 10rpm. The radius of the merry-
go-round is R = 2m.
a) If the dura

Pinball Wizard
A pinball machine has a spring (spring
constant k) on a ramp. Ini?ally the
spring is at its equilibrium posi?on,
which well call x = 0:
+x
x=0
+x
x=0
A) A ball of mass m is loaded o

Pinball Wizard
A pinball machine has a spring (spring
constant k) on a ramp. Ini?ally the
spring is at its equilibrium posi?on,
which well call x = 0:
+x
x=0
+x
x=0
A) A ball of mass m is loaded o

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

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 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).

Review 5: Rota,onal Mo,on
October 10 15, 2013
Beatriz E Burrola Gabilondo
Rota,on
Rota,onal Kinema,cs (constant )
Rela,onship between linear and angular quan,es
Rota,onal Kine,c Energy
Torque and Angular Momentum

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

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 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

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

Lecture 23: Diffusion:
Microscopic and Macroscopic
Reading:
Handout on web
11/26/2013
Motivation: Diffusion is central to life
O2 and CO2 are transferred to and from lungs to red blood cells. Breathe
in, blood flows past, oxygen diffuses in. How many alve

Physical Sciences 2: Final Exam Review
Dealing with one or a few objects
Before-and-after: Describe
the change that takes place
in a system, without details.
Change in Momentum
Detailed Dynamics: Can
describe all the details
about the system.
Isolated sys

Lecture 24: Diffusion,
Review of Lectures 16-24
Reading:
Handout on web
12/3/2012
Practical membranes: flux and permeability
Ficks law can appear in disguise,
depending on the dimensions
used for concentration:
Mole
Mass
Number
Volume
Real membranes are u

Lecture 22: Boltzmann and
Random Walks
11/21/2013
The Boltzmann Distribution
The probability distribution from the barometric formula is an example of a
much more general relation called the Boltzmann distribution, valid for any
conservative force (not ju

Lecture 24: Diffusion,
Review of Lectures 16-24
Reading:
Handout on web
12/3/2012
Practical membranes: flux and permeability
Ficks law can appear in disguise,
depending on the dimensions
used for concentration:
Mole
Mass
Number
Volume
Real membranes are u