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Homework answers / question archive / Queens College, CUNY  PHYSICS 152 Chapter 7—Conservation of Energy MULTIPLE CHOICE 1)Any change of the energy of a system occurs because of energy transfer across the boundaries of the system
Queens College, CUNY  PHYSICS 152
Chapter 7—Conservation of Energy
a. 61?
b. 54?
c. 69?
d. 77?
e. 47?
a. 0.35 kJ 


b. 0.73 kJ 


c. 0.40 kJ 


d. 0.68 kJ 


e. 0.19 kJ


.
The most likely physical situation it describes is
a. 17 m/s 


b. 19 m/s 


c. 18 m/s 


d. 20 m/s 


e. 12 m/s



0.20 m. How far does the mass slide from the point of release until it is brought momentarily to rest? a. 0.98 m
b. 0.68 m
c. 0.82 m
d. 0.55 m
e. 0.20 m
a. 2.0 J 


b. 1.8 J 


c. 2.2 J 


d. 1.6 J 


e. 1.0 J


a.
x_{A} = x_{B}.
The total mechanical energy of the system when the mass is hanging at rest is
? kx^{2}.
c. 0. d.
+ kx^{2}.
e. +kx^{2}.
a. 0.060 m.
b. 0.085 m.
c. 0.12 m.
d. 0.17 m.
e. 0.24 m.
a. 200 N/m.
b. 400 N/m.
c. 800 N/m.
d. 1 600 N/m.
e. 3 200 N/m.
a.
.
b. v_{4} = v_{2} > v_{3} = v_{1}. c.
.
d. v_{1} = 2v_{2} = 3v_{3} = 4v_{4}.
e.
.
a. K_{B} = K_{A}. 


b. K_{B} = 2K_{A}. 


c. K_{B} = 4K_{A}. 


d. K_{A} = 2K_{B}. 


e. K_{A} = 4K_{B}. ANS: B 

a. 0.34
b. 0.24
c. 0.13
d. 0.44
e. 0.17
a. ?6.1 J
b. ?4.6 J
c. ?5.3 J
d. ?6.8 J
e. ?2.7 J
a. ?0.64 kJ
b. ?0.40 kJ
c. ?0.52 kJ
d. ?0.28 kJ
e. ?0.76 kJ
0.50 kg, d = 10 cm, and the coefficient of kinetic friction between the block and the horizontal surface is equal to 0.25, determine the speed of the block when it first passes through the position for which the spring is unstretched.
a. 92 cm/s 


b. 61 cm/s 


c. 71 cm/s 


d. 82 cm/s 


e. 53 cm/s


a. 0.32
b. 0.45
c. 0.58
d. 0.19
e. 0.26
b. +35 J
c. +15 J
e. +55 J
a. ?8.9 J
b. ?7.3 J
c. ?8.1 J
d. ?6.6 J
a. ?2.7 J
b. ?8.8 J
c. ?4.7 J
d. ?6.7 J
e. ?19 J
a. ?0.46 kJ
b. ?0.53 kJ
c. ?0.61 kJ
d. ?0.38 kJ
e. ?0.81 kJ
b. ?0.47 kJ
c. ?0.40 kJ
d. ?0.34 kJ
e. ?0.69 kJ
a. ?4.0 J
b. ?3.5 J
c. ?2.4 J
d. ?2.9 J
e. ?15 J
d. ?8.0 J
e. ?28 J
c. 0.30 m
Which description best fits the equation?
inclined at a 30? angle.
a. 5.6.
b. 22.0.
c. 32.9.
d. 54.8.
e. 76.8.
a. 5.6.
b. 22.0.
c. 32.9.
d. 54.8.
e. 76.8.
a. 5.25 kW.
b. 24.8 kW.
c. 30.4 kW.
a. 746
b. 3.43 ? 10^{5}
c. 3.73 ? 10^{5}
d. 7.46 ? 10^{5}
e. 2.61 ? 10^{7}
b. 460
c. 500
d. 1 000
e. 35 000
c. 65.
d. 408.
e. 4 567.
e. +71 W
a. +39 W
d. +78 W
e. +25 W
a. +98 W
b. +63 W
c. zero
d. +75 W
e. ?75 W
a. +28 W
b. +13 W
e. +6.5 W
= 400 000 N/m is located at the end of the tracks. At the spring's maximum compression, the car is at an elevation 10 m lower than its elevation at the starting point. How much is the spring compressed in stopping the ore car? Ignore friction.
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