CHEM 161 Exam 1. The exam contains 25 questions each worth 4 1/2 points. Be sure to use pencil to shade in
your answer on the bubble sheet. You have 50 minutes to complete the exam. Any acts of academic dishonesty
will result in failure for the course.
Bu
INTRODUCTION
The concept of electric field was introduced by Michael Faraday. The electrical field force acts
between two charges, in the same way that the gravitational field force acts between two masses .
In physics, an electric field is the region of
Experiment 8. Determination of the Molar Mass of an
Unknown Acid by Acid-Base Titration
In this experiment you will:
Prepare and standardize a solution of sodium hydroxide
Determine the molecular weight of an unknown acid by reacting the acid with standar
EXPERIMENT 12 B: Titration of an Unknown Acid
INTRODUCTION
In this experiment you will determine the molar mass of an unknown acid by titration with the
sodium hydroxide solution you prepared and standardized in experiment 12A.
Your unknown solid is an ac
Physics 221
Chapter 9 Homework Problem Solutions
3.
The force is the derivative of the momentum with respect to time.
r
r
2
r
i
r dp d 4.8t 8.0 j 8.9t k
r
F
9.6t 8.9 k N
i
dt
dt
r
vf
r
v0
5.
The change is momentum is due to the change in direction.
r
r
r
PHY 221 CH 11 Homework Solutions
1. The angular momentum is given by Eq. 11-1.
L I MR 2 0.210 kg 1.35 m
5.
2
10.4 rad s
3.98 kg g 2 s
m
There is no net torque on the diver because the only external force (gravity) passes through the center
of mass of
PHY 221 CH 13 Homework Solutions
5.
To find the specific gravity of the fluid, take the ratio of the density of the fluid to that of water,
noting that the same volume is used for both liquids.
m V fluid mfluid 89.22 g 35.00 g
SJ fluid fluid
0.8547
wa
Physics 221
Chapter 7 Homework Problem Solutions
1. The force and the displacement are both downwards, so the angle between them is
WG mgd cos 280 kg 9.80 m s 2
r
FP
y
r
FN
2.80 m cos 0
o
0o.
Use Eq. 7-1.
7.7 103 J
x
r
mg
7. Draw a free-body diagram of
Physics 221
Chapter 4 Homework Problem Solutions
5.
Find the average acceleration from Eq. 2-12c, and then find the force needed from Newtons second law. We
assume the train is moving in the positive direction.
v 2 v02
1m s
v 0 v0 120 km h
33.33
m
s
a
Position of Gate #2 (cm)
Berween
Gate1 Time (s) (gate mode) Gate 2 Time (s) (gate mode) Time mode)
(Pulse
t1
t2
t3
Gates(s) Velocity at Gate1 (cm/s)
X
Acceleration
(cm/s^2)
v=12.5/B:B
v0=12.5/A:A
Velocity at Gate2 (cm/s)
of
glider
a=(F:F-E:E)/C:C
0.5464
0