CHAPTER 1
CYU 1:
(a)
yes
(b)
no
CYU 2:
No.
CYU 3:
a, b, c, f
CYU 4:
No.
CYU 5:
b, d
CYU 6:
(a)
11 m
(b)
5 m
CYU 7:
No.
CYU 8:
Yes.
CYU 9:
(a)
The magnitude of
is equal
to the magnitude of
.
(b)
The direction of
is opposite
to the direction of
.
CYU 10:
Vector
is perpendicular to
vector
.
CYU 11:
Vector
points in the same
direction as vector
.
CYU 12:
and
CYU 13:
(a)
is
and
is
(b)
is
and
is
(c)
is
and
is
CYU 14:
No.
CYU 15:
Yes.
CYU 16:
(a)
and
(b)
and
(c)
and
(d)
and
CYU 17:
No.
CYU 18:
(1)
CHAPTER 2
CYU 1:
0 m
CYU 2:
scalar quantity
CYU 3:
No.
CYU 4:
a
CYU 5:
due
east, average
CYU 6:
Yes.
CYU 7:
No.
CYU 8:
c
CYU 9:
No.
CYU 10:
No.
CYU 11:
the rifle with the short barrel
CYU 12:
1.73
v
CYU 13:
a
CYU 14:
b
CYU 15:
b
CYU 16:
b
speed
8.0 m/s
average velocity
2.7 m/s
A
y
0 units
A
x
12 units
A
y
12 units
A
x
0 units
A
y
0 units
A
x
12 units
A
y
12 units
A
x
0 units
R
y
R
x
B
y
B
x
A
y
A
x
D
B
A
B
B
B
A
B
B
B
A
B
A
B
B
B
A
B
B
B
ANSWERS
TO CHECK YOUR UNDERSTANDING
CHAPTER 3
CYU 1:
b
CYU 2:
c
CYU 3:
a and c
CYU 4:
(a)
Yes; when the object is at its
highest point.
(b)
no
CYU 5:
No.
CYU 6:
b
CYU 7:
(a)
when the ball is at its highest
point in the trajectory
(b)
at the initial and final positions
of the motion
CYU 8:
Yes.
CYU 9:
Both bullets reach the ground at
the same time.
CYU 10:
(a)
The displacement is greater for
the stone thrown horizontally.
(b)
The impact speed is greater for
the stone thrown horizontally.
(c)
The time of flight is the same
for both stones.
CYU 11:
No.
CYU 12:
Ball A has the greater launch speed.
CYU 13:
(a)
(b)
(c)
(d)
CYU 14:
No.
CYU 15:
The two times are the same.
CYU 16:
(a)
The range toward the front is
the same as the range toward
the rear.
(b)
The range toward the front is
greater than the range toward
the rear.
CYU 17:
swimmer A
CHAPTER 4
CYU 1:
b
CYU 2:
c
CYU 3:
d
CYU 4:
No, because two or more forces
can cancel each other, leading to a
net force of zero.
CYU 5:
c
CYU 6:
a and d
CYU 7:
b
CYU 8:
Yes, because the ratio of the two
weights depends only on the
masses of the objects, which are
the same on the earth and on Mars.
CYU 9:
a
CYU 10:
d
60 m/s
40 m/s,
30 m/s,
70 m/s,
CYU 11:
No.
CYU 12:
a
CYU 13:
b
CYU 14:
c
CYU 15:
To pull, because the upward
component of the pulling force
reduces the normal force and,
therefore, also reduces the force of
kinetic friction acting on the sled.
CYU 16:
CYU 17:
c, a, b
CYU 18:
a
CYU 19:
a
CYU 20:
b
CYU 21:
d
CYU 22:
No, because there must always be
a vertical (upward) component of
the tension force in the rope to
balance the weight of the crate.
CYU 23:
c
CYU 24:
No, because the transfer described
does not change the total mass
being pulled by the engine.
CYU 25:
a
CHAPTER 5
CYU 1:
(a)
The velocity is due south and
the acceleration is due west.
(b)
The velocity is due west and
the acceleration is due north.
CYU 2:
Yes, if you are going around a
curve.
CYU 3:
the person at the equator
CYU 4:
a and b
CYU 5:
AB
or
DE
,
CD
,
BC
CYU 6:
(a)
4
r
(b)
4
r
CYU 7:
No.
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 Spring '09
 Thomas
 Physics, Force, Kilogram, Prime number, Bankruptcy in the United States, CYU, U M B E R E

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