Section 11.1
The Many Forms of Energy
Practice Test
1.
Stored energy that is a result of the gravitational interaction between an object and Earth is __________.
a.
the reference level
b.
mechanical energy
c.
elastic potential energy
d.
gravitational potential energy
Hint
2.
You lift a 2.73-kg textbook from the floor to a shelf 1.75 m above the floor. What is the book's gravitational potential energy relative to the floor?
a.
-46.8 J
b.
93.1 J
c.
46.8 J
d.
14.3 J
Hint
3.
The __________ is the position at which gravitational potential energy is zero.
a.
reference level
b.
release point
c.
height
d.
initial position
Hint
4.
In Figure 11-5, if the mass of an orange is about 0.6 kg, about how much more gravitational potential energy does the topmost orange have than the one in the juggler's left hand?
a.
6 J
b.
60 J
c.
600 J
d.
0.6 J
Hint
5.
Objects that are lifted against the force of gravity have stored energy known as __________.
a.
reference levels
b.
potential energy
c.
resistance
d.
kinetic energy
Hint
6.
The equation that represents gravitational potential energy is __________.
a.
PE
g
=
Fd
b.
PE
g
=
E
+
KE
c.
PE
g
= 1/2
mv
2
d.
PE
g
=
mgh
Hint
7.
A 75-kg rock climber first climbs 25 m to the top of a quarry, then descends 75 m from the top to the bottom of the quarry. If the initial height is the reference level, what is the potential energy at the bottom?
a.
3.7×10
4
J
b.
-5.5×10
4
J
c.
1.8×10
4
J
d.
-3.7×10
4
J
Hint
8.
A 75-kg rock climber first climbs 25 m to the top of a quarry, then descends 75 m from the top to the bottom of the quarry. If the initial height is the reference level, what is the potential energy of the system (climber plus Earth) at the top?
a.
1.8×10
4
J
b.
-3.7×10
4
J
c.
-1.8×10
4
J
d.
3.7×10
4
J
Hint
