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Homework answers / question archive / Pasadena City College  PHYSICS 1a Chapter 8—Conservation of Energy MULTIPLE CHOICE 1)A single conservative force Fx = (6
Pasadena City College  PHYSICS 1a
Chapter 8—Conservation of Energy
1)A single conservative force F_{x} = (6.0x ? 12) N (x is in m) acts on a particle moving along the x axis. The potential energy associated with this force is assigned a value of +20 J at x = 0. What is the potential energy at x = 3.0 m?
a. +11 J
b. +29 J
c. +9.0 J
d. ?9.0 J
e. +20 J
b. +78 J
c. ?18 J
d. +48 J
e. +80 J
a. +65 J
b. +15 J
c. +35 J
d. +45 J
e. ?40 J
a. +72 J
b. +10 J
c. +90 J
d. +28 J
e. +68 J
a. 0.78 m/s
b. 0.81 m/s
c. 0.71 m/s
d. 0.58 m/s
e. 0.64 m/s
a. 7.4 J 


b. 5.4 J 


c. 6.1 J 


d. 6.7 J 


e. 4.9 J


a. 61?
b. 54?
c. 69?
d. 77?
e. 47?
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. 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. 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
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.
mgl.
b. 3mgl. c.
mgl.
a. 5.25 kW.
b. 24.8 kW.
c. 30.4 kW.
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. 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.
Which description best fits the equation?
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.
.
b. v_{4} = v_{2} > v_{3} = v_{1}. c.
.
d. v_{1} = 2v_{2} = 3v_{3} = 4v_{4}.
e.
.
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
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