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Physics 105 QuickReview
Problem statements, answers, formula summaries
Rev. 4/08
Note:
Problem numbers refer to a previous textbook
Underlined problems will probably be worked in class
Contents:
•
Linear Kinematics:
428,
429
•
Newton’s Second Law:
538, 543,
545
•
More 2
nd
Law, Friction:
620
, 622,
627
,
639
•
Kinetic Energy and Work:
716
,
717, 722
•
PE, Energy Conservation:
84
,
819, 823,
836
•
Mass Ctr., Momentum:
93
,
94
, 922, 939,
940
•
Impulse and Collisions:
102
, 107,
1030
, 1035
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Answers to Physics 105 Review Problems
for Physics 106 Students (12/2003, rev 5/2006, rev 4/2008)
428:
a) 12.0 m above release point b) v
x
= unchanged = 19.15 m/s, v
y
= 4.81 m/s
c) No, since v
y
is positive
429:
a) 10.9 m.
b) 22.7 m
c) 16.5 m/s
d) – 62.5 degrees
538:
a) 0.74 m/s
2
,
b)
7.27 m/s
2
543:
a)
0.735 m/s
2
,
b)
down,
c)
T = 20.8 N
545:
a)
1.18 m
b)
0.674 s
c)
v = 3.5 m/s
620:
max fs = 21.7 N
a) fs = 16.6 N up
b)
fs = 19.64 N up
c)
fk = 14.8 N (slides)
622:
Mass of block B = 3.3 kg
627:
the block slides on the slab
a)
a(block) = 6.08 m/s
2
b)
a(slab) = 0.98 m/s
2
639:
21 m
716:
a) 267 N
b)
401 J
c)
+401 J
d)
zero
e)
Zero
717:
a)
11,642 J
b)
10,584 J
c)
1058 J
d)
5.4
m/s
722:
a)
0.29 J
b)
1.8 J
c)
3.5 m/s
84:
a)
zero
b)
mgh/2
c)
mgh
d)
+mgh/2
e)
mgh
f)
It would double as m > 2m
819:
39.2 J
b)
2.0 m
vertical
c)
4.0
m
d)
39.2
J
823:
a)
4.85
m/s
b)
2.42
m/s
836:
a)
4.8 N
b)
x = 1.5 m and x = 14 m
c)
3.4
m/s
93:
a)
xcm = 1.07
m
b)
ycm
= 1.33 m
94:
xcm
=
0,
ycm
=
0.2L
922:
Np
=
4.9 kgm/s
939:
v
=
14
m/s at 225
o
CCW from xaxis
940:
one chunk has v = 0,
the other has v = 4 m/s
102:
6.2 x 10
4
N
107:
a)
42 kgm/ s
b)
2100 N
1030:
7.35
cm
1035:
a)
1.9
m/s
b)
yes
c)
v =  5.6 m/s
No.
3
Summary:
Chapter 4
Linear Kinematics
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Problem 4 28P:
You throw a ball toward a wall with a speed of 25.0 m/s and at an angle of 40.0°
above the horizontal (Fig. 435). The wall is 22.0 m from the release point of the ball. (a) How far
above the release point does the ball hit the wall? (b) What are the horizontal and vertical
components of its velocity as it hits the wall? (c) When it hits, has it passed the highest point on its
trajectory?
Problem 4 29E*:
A ball is shot from the ground into the air. At a height of 9.1 m, its velocity is
observed to be
v
= 7.6
i
+ 6.1
j
in meters per second (
i
horizontal, upward
j
). (a) To what maximum
height does the ball rise? (b) What total horizontal distance does the ball travel? What are (c) the
magnitude and (d) the direction of the ball's velocity just before it hits the ground?
5
Force and Motion – I
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PROBLEM 538:
A worker drags a crate across a factory floor by pulling on a rope tied to the crate
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 Summer '09
 Turner
 Physics, Work

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