Name: 90 A) Air/0 fl ‘2 Section: III 9am El 11am El 2pm El 3pm
PHYS 141 - Written Homework #03
Due Date: 11:59pm on Wednesday, February 3, 2016
Black ink is recommended for a clear pdf submission; unclear work cannot receive credit.
1. (8 points) Solve pr
Name: gig/lg 7th! fl 2 Section: [II 9am III 11am El 2pm El 3pm |:|
PHYS 141 - Written Homework #04
Due Date: 11:59pm on Wednesday, February 10, 2016
Black ink is recommended for a clear pdf submission; unclear work cannot receive credit.
1. (8 points) Lik
Your submission for Physics WHW-14
2016.spring.phys.141.26635
Total Score: 20.0
Summary
Assessment summary message
Solutions are posted on Blackboard!
Q1 Score: 5.0
Q2 Score: 5.0
Q3 Score: 10.0
Q4 Not graded
. I
Name: 90/1/ 7475’” 9 Section: El 9am D11am El 2pm 1:! 3pm
PHYS 141 — Written Homework #01
Due Date: 11:59pm on Wednesday, January 20, 2016
All remaining Written Homework assignments are for credit. Black ink is recommended for a clear pdf
submission;
Name:_:J_O_I_LJ_f_1_'o_n
_
Section: D 9am
D 11 am
D 2pm
D 3pm
PHYS 141 - Written Homework #05
Due Date: 11:59pm on Wednesday, February 17, 2016
Black ink is recommended for a clear pdf submission. All four pages must be submitted, and in order!
no - this
Name: 90 /V 7L] 0/, 9 Section: El 9am El 11am El 2pm El 3pm
PHYS 141 - Written Homework #02
Due Date: 11:59pm on Wednesday, January 27, 2016
Black ink is recommended for a clear pdf submission; unclear work cannot receive credit.
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Name: )0 ll O/l 5 Section: III 9am III 11am El 2pm El 3pm p ySID
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PHYS 141 - Written Homework #08
Due Date: 11:59pm on Wednesday, March 9, 2016
Black ink is recommended for a clear pdf submission. All four pages must be submitted, and in ord
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Name: V 1’ I 0 n 9 Section: III 9am El 11am III 2pm I] 3pm I)th
PHYS 141 - Written Homework #07
Due Date: 11:59pm on Wednesday, March 9, 2016
Black ink is recommended for a clear pdf submission. All four pages must be submitted, and in order!
1.
Chapter 14 Solutions
14.17.
m
. Use the information about the empty chair to calculate k.
k
SET UP: When m = 42.5 kg, T = 1.30 s.
IDENTIFY: Apply T = 2
EXECUTE: Empty chair: T = 2
m
4 2 m 4 2 (42.5 kg)
. gives k =
=
= 993 N/m.
k
T2
(1.30 s) 2
m
T 2k (2.54
Chapter 13 Solutions
13.8.
IDENTIFY: Use Fg = Gm1m2 /r 2 to find the force each point mass exerts on the particle, find the net force, and
use Newtons second law to calculate the acceleration.
SET UP: Each force is attractive. The particle (mass m) is a d
Chapter 1 Solutions
1.22.
1.26.
IDENTIFY: Estimate the number of beats per minute and the duration of a lifetime. The volume of blood
pumped during this interval is then the volume per beat multiplied by the total beats.
SET UP: An average middle-aged (40
Chapter 7 Solutions
7.12.
IDENTIFY: Only gravity does work, so apply K1 + U1 = K 2 + U 2 .
SET UP: v1 = 0, so
1 mv 2
2
2
= mg ( y1 y2 ).
EXECUTE: Tarzan is lower than his original height by a distance y1 y2 = l (cos30 cos 45) so his speed is
v = 2 gl (cos
Chapter 10b Solutions
10.34.
IDENTIFY: Apply z = I z to the motion of the propeller and then use constant acceleration equations to
analyze the motion. W = .
1 mL2 = 1 (117 kg)(2.08 m) 2 = 42.2 kg m 2 .
SET UP: I = 12
12
EXECUTE: (a) =
I
=
1950 N m
42.2 k
Chapter 10a Solutions
10.2.
IDENTIFY: = Fl with l = rsin . Add the two torques to calculate the net torque.
SET UP: Let counterclockwise torques be positive.
EXECUTE: 1 = F1l1 = (8.00 N)(5.00 m) = 40.0 N m.
2 = + F2l2 = (12.0 N)(2.00 m)sin30.0 = +12.0 N
Chapter 3 Solutions
3.10.
IDENTIFY: The person moves in projectile motion. She must travel 1.75 m horizontally during the time she
falls 9.00 m vertically.
SET UP: Take + y downward. a x = 0, a y = +9.80 m/s 2 . v0 x = v0 , v0 y = 0.
EXECUTE: Time to fall
Chapter 11 Solutions
11.12.
IDENTIFY: Apply the first and second conditions of equilibrium to the beam.
SET UP: The boy exerts a downward force on the beam that is equal to his weight.
EXECUTE: (a) The graphs are given in Figure 11.12.
(b) x = 6.25 m when
Chapter 5 Solutions
5.18.
r
r
IDENTIFY: (a) Consider both gliders together as a single object, apply F = ma , and solve for a. Use a in a
constant acceleration equation to find the required runway length.
r
r
(b) Apply F = ma to the second glider and solv
Chapter 9 Solutions
9.3.
d z
. Using z = d /dt gives 0 =
dt
d n
1 n +1
t = nt n 1 and t n dt =
t
dt
n +1
IDENTIFY: z (t ) =
SET UP:
t2
t z dt.
1
EXECUTE: (a) A must have units of rad/s and B must have units of rad/s3.
(b) z (t ) = 2 Bt = (3.00 rad/s3 )t.
Spring 2010
Physics 141 Practice Exam I Solutions
Phy141_mt1a_soln.pdf
Page 1/6
Spring 2010
Physics 141 Practice Exam I Solutions
Phy141_mt1a_soln.pdf
Page 2/6
Spring 2010
Physics 141 Practice Exam I Solutions
Phy141_mt1a_soln.pdf
Page 3/6
Spring 2010
Phy
Q1. On the graph shown, Construct the
vector R = A +B +C
Questions 2—7: You are given two vectors, £1 = 3 f ~ 2] and E = —4 f + 2} + 5/}, Calculate:
Q2. Thermagnitude of each vector
.»
Rst32+-(~2)t: Zlél I ) Bzdzll)2'+»(2)m+ 5"“ :2 M
Q3. The magnitude o
Problem 1. (.15 points) Two crates, one with mass 4.0 kg and the other with mass 6.0 kg, sit on
the frictionless surface of a frozen pond, 600 k
connected by a light rope (see Figure). A
woman Wearing golf shoes (so she can get
traction on the ice) pulls
Q1. (20 points) The graph below shows the velocity of an object moving on the x-axis as a
function of time. At t = 0, the object is at position x = 15m. v ‘ ‘
Velocity(m/s)
o 1 2 3 4 5 6 7 8 9 10
time (seconds)
a) Where is the particle loc
SHORT PROBLEMS (6 problems 30 points total)
Show your work and clearly circle your answers. Each problem is worth 5 points. Partial credit may be
given.
r
g
S1. A projectile is launched from the origin with initial velocity of
vo = 18.0 m/s at an angle of
MA 181
Practice Problems for Midterm 2
Spring 2011
1
1. Determine if the intergal
ln x dx converges or diverges.
0
2. Determine if the intergal
xex dx converges or diverges.
0
(1)n+1
3. Determine the sum of the series
n=0
3n+2
4n1
4. Find the arc length o
SHORT PROBLEMS (6 problems — 30 points total)
Show your work and clearly circle your answers. Each problem is worth 5 points. Partial credit may be
given.
31. A projectile is launched from the origin with initial velocity of
V0 = 18.0 m/s at an angle of
Physis 141 Practice Final Exam (made from selected problems given on past exams)
1.
o
(a) A block of mass m slides down a = 30.0
incline plane. The coefficient of kinetic friction
between the block and the surface of the incline
plane is k = 0.300. What i
1.
(a) A block of mass m slides down a 0 = 30.0°
incline plane. The coefﬁcient of kinetic ﬁ'iction . 7
between the block and the surface of the incline
plane is pg = 0.300. is the acceleration of the
box?
(b) A solid spheae of mass m, radius re and mome
Spring 2011
Physics 141 Midterm2 Practice Exam a
Phy141_mt2a.pdf
SHORT PROBLEMS (6 problems 30 points total)
Show your work and clearly circle your answers. Each problem is worth 5 points. Partial credit will be
given.
S1. A massless spring with spring co
Spring 2011
Physics 141 Midterm2 Practice Exam a Solutions
Phy141_mt2a_soln.pdf
Page 1/8
Spring 2011
Physics 141 Midterm2 Practice Exam a Solutions
Phy141_mt2a_soln.pdf
Page 2/8
Spring 2011
Physics 141 Midterm2 Practice Exam a Solutions
Phy141_mt2a_soln.p