Physics 2314, Homework #6 (due 3/7)
Multiple choice questions
M1 A particle is moving in a conservative force eld from point a to point b. At point a the
particles potential energy is equal to its kinetic energy, and at point b the particles
potential ene
Physics 1214, Homework #3: solutions
Answers to multiple choice questions: M1: B; M2: B, C.
P1: 490 N
P2: (a) = 30
1
(b) k = 1 = 0.293
2
F cos
mg F sin
(no numerical value since the magnitude of F was not provided)
P3: k =
P4: a = (2i + 1.5j) m/s2
|a| =
Physics 2314, Homework #4 (due 2/21)
Multiple choice questions
M1 For an object moving along the radius with a constant velocity in a rotating reference
frame, Coriolis force is
A. parallel to centrifugal force.
B. perpendicular to centrifugal force.
C. z
Physics 2314, Homework #3 (due 2/7)
Multiple choice questions
M1 A system of frictionless pulleys is at equilibrium (the acceleration of each of the blocks
m1 and m2 is zero). What is the ratio of masses m1 /m2 ?
A. 1/3
B. 1/2
C. 1
D. 2
E. 3
M2 A block is
Physics 1214, Homework #2: solutions
Answers to multiple choice questions: M1: A, D; M2: (a) B, (b) C.
g
x2
P1: y = x tan 2
2v cos2
0.196x2 3x + 2.5 = 0
x=1.82 m or x=7.02 m
1
P2: x = vt, y = gt2
2
x=v
P3: a =
2H
= 1.56 m
g
v2
= 2 m /s 2
r
P4: 69.3 km/h,
Physics 1214, Homework #1: solutions
Answers to multiple choice questions: M1: C, M2: B,C; M3: B.
P1:
A + B = 3i + 4j
A B = i
|A + B| = 5
|A B| = 1
(A + B) = 53.13
(A B) = 180
P2: b = 1, a = 2
P3: (a) x = 9 m, vx = 6 m/s, ax = 2 m/s2
(b) x = 5 m, vx = 2 m
Physics 2314, Homework #2 (due 1/31)
Multiple choice questions
M1 What is constant in uniform circular motion? (There can be more than one correct
answer.)
A. speed
B. velocity
C. acceleration
D. the magnitude of acceleration
M2 (a) For a projectile with
Physics 1214, Homework #4: solutions
Answers to multiple choice questions: M1: B; M2: C.
P1: v =
P2: a =
gL sin = 1.2 m/s
sin( )
= 1.76 m/s
cos
P3: T satises
mv 2
T2
T (mg )2 = 0
L
Positive solution: T = 9.7 N
P4: v =
8 sphere rg
= 117 m/s
3 Dair
Physics 2314, Homework #5 (due 2/28)
Multiple choice questions
M1 Potential energy of a particle is given by the equation U = 2x4 4x2 , where x is in
meters and U is in joules.
(a) What are the points where the particle is in stable equilibrium?
A. 0
B. 1
Physics 1214, Homework #8: solutions
Answers to multiple choice questions: M1: B; M2: B; M3: (a) B, (b) E.
P1: (a) A B = 2, A B = i j
(b) 22 + ( 2)2 = ( 2 3)2
(c) yes, because cos2 + sin2 = 1
P2: T sin = m 2 r
T cos = mg
=
g
tan
r
r = l sin
L = I = mr2
Physics 1214, Homework #9: solutions
Answers to multiple choice questions: M1: C; M2: B.
P1: Assuming origin at the bottom left corner of each gure: (a) x = 6.25 cm, y = 6.25 cm;
(b) x = 6.91 cm, y = 7 cm.
P2: m1 = 9 g, m2 = 52.5 g, m3 = 49 g.
P3: s =
P4:
Physics 1214, Homework #6: solutions
Answers to multiple choice questions: M1: C; M2: (a) D, (b) C.
P1: v =
k x2 2mgx
= 1.42 m/s
m
1
v
1
P2: 0 = m1 v 2 + m2
2
2
2
v=
P3: t =
2
m1 gH + m2 g
H
2
8gH
= 1.06 m/s
7
mgh
= 2.18 108 s 7 years
P
P4: (a) After rst
Physics 2314, Homework #1 (due 1/24)
Multiple choice questions
M1 Vector A has a magnitude of 2 m, and vector B has a magnitude of 5 m. Mark all
possible values for the magnitude of A B.
A. 3 m
B. 0
C. 5 m
D. 10 m
M2 Which of the following is true? (There