4.45.
Model:
Visualize:
Solve:
The particle model for the ball and the constant-acceleration equations of motion are assumed.
(a) Using y1 # y0 $ v0 y ! t1 % t0 " $ 1 a y ! t1 % t0 " ,
2
2
h # 0 m $ !
. Starting from rest. a l2cm-diametcr compact disk takes 3.0 s
to reach its operating angular velocity of 2000 rpm. Assume
that the angular acceleration is constant. The disks moment
ofittertia i525
9.34. Model: Model the skaters as particles. The two skaters, one traveling north (N) and the other traveling
west (W), are a system. Since the two skaters hold together after the collision, this is a
131I AU10
Midterm #2
Potentially Useful Information
1
x f = xi + vi t + at 2
2
v f = vi + at
v f = vi + 2a ( x f xi )
2
2
dx
dt
dv
a=
dt
v=
r
r
F = ma
Fx = max
F
y
= ma y
W = mg
Fs = kx
f k = k N
f s
Introduction to Logger Pro
This section of the lab manual is intended as a resource for understanding the
fundamentals of the hardware and software used for data collection and analysis in this
Physic
1.55. Model: The car is represented by the particle model as a dot.
Solve:
(a)
Time t (s)
0
10
20
30
40
50
60
70
80
90
(b)
Position x (m)
1200
975
825
750
700
650
600
500
300
0
2.4. Solve: (a) The ti
8.6.
Model: Treat the block as a particle attached to a massless string that is swinging in a circle on a
frictionless table.
Visualize:
Solve:
(a) The angular velocity and speed are
" # 75
rev 2! rad
11.48. Model: Identify the truck and the loose gravel as the system. We need the gravel inside the system
because friction increases the temperature of the truck and the gravel. We will also use the m
7.29. Model: Assume package A and package B are particles. Use the model of kinetic friction and the
constant-acceleration kinematic equations.
Visualize:
Solve: Package B has a smaller coefficient of
Below is a position vs. time plot, which describes the
motion of a car. At what point is the displacement
from the origin greatest?
x
B
0 of
100
100
B
0%
A
=
A
A
0%
B
0%
t
1. PointA
2. PointB
3. Displ
You do not need the 131 Lab Manual. Everything you need for lab in this course will be
on Carmen for you to print out and bring to lab. All you need to bring to lab is a lab
notebook. If you bought a
12.10. Model: The triangle is a rigid body rotating about an axis through the center.
Visualize: Please refer to Figure EX12.10. Each 200 g mass is a distance r away from the axis of rotation,
where r
12.22. Model: The disk is a rotating rigid body.
Visualize:
The radius of the disk is 10 cm and the disk rotates on an axle through its center.
Solve: The net torque on the axle is
! = FA rA sin "A +
10060001_1
A ladybug sits at the outer edge of a merry-go-round, and a
gentleman bug sits halfway between her and the axis of
rotation. The merry-go-round makes a complete revolution
once each second.
2.17. Model: We represent the ball as a particle.
Visualize:
Solve: Once the ball leaves the students hand, the ball undergoes free fall and its acceleration is equal to the
acceleration due to gravit
9.30. Model: Model the rubber ball as a particle that is subjected to an impulsive force when it comes in contact
with the floor. We will also use constant-acceleration kinematic equations and the imp
Physics 131 in Fall, 2010
Midterm #1
Potentially Useful Information
1
x f = xi + vi t + at 2
2
v f = vi + at
v f 2 = vi 2 + 2a ( x f xi )
dx
dt
dv
a=
dt
v=
F = ma
F = ma
F = ma
x
x
y
y
W = mg
f k =
Experiment 4: the Monster Truck and Airplane Flier Problems
Goal: Apply free body diagrams and their corresponding force equations to more complex
situations.
Activity 1, the monster truck:
1. Clean t
Rotational Kinematics and Dynamics
Goals:
Become familiar with the rotational kinematic variables such as angular position ,
angular velocity and angular acceleration .
Learn to apply Newtons 2nd La
FEH Physics Request for Regrading
Your name:_ TAs name
_
Exam regrade is requested for (please circle)
Group MT1
Individual MT1
Group MT2
Individual MT2
Final
Problem(s) to be regarded: _
(Please note