pasha (sep635) – HW 64 – Antoniewicz – (56445)
1
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11
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001
8.0 points
Consider an isolated system, by which we
mean a system free of external forces. if the
sum of the particle energies in the system
increases by 30 J, what must have been the
change
Δ
U
in the system’s potential energy?
Correct answer:

30 J.
Explanation:
By conservation of energy, we know that
Δ
E
particle
+
Δ
U
= 0
,
so we can write
30 J +
Δ
U
= 0
⇒
Δ
U
=

30 J
.
002 (part 1 of 5) 2.0 points
The figure below shows the path of a comet
orbiting a star.
A
B
C
D
E
Rankorder the locations on the path in
terms of the magnitude of the comet’s mo
mentum at each location, starting with the
location at which the magnitude of the mo
mentum is the largest.
1.

p
E

>

p
D

>

p
C

>

p
B

>

p
A

correct
2.

p
E

=

p
D

>

p
C

>

p
B

=

p
A

3.

p
A

=

p
B

=

p
C

=

p
D

=

p
E

4.

p
D

>

p
E

>

p
C

>

p
B

>

p
A

5.

p
A

>

p
B

>

p
C

>

p
D

>

p
E

Explanation:
Momentum increases as the comet gets
closer to the Sun; therefore

p
E

>

p
D

>

p
C

>

p
B

>

p
A

.
003 (part 2 of 5) 2.0 points
Rankorder the locations on the path in terms
of the comet’s kinetic energy at each location,
starting with the location at which the kinetic
energy is the largest.
1.
K
D
> K
E
> K
C
> K
B
> K
A
2.
K
A
> K
B
> K
C
> K
D
> K
E
3.
K
E
> K
D
> K
C
> K
B
> K
A
correct
4.
K
E
=
K
D
> K
C
> K
B
=
K
A
5.
K
E
=
K
D
=
K
C
=
K
B
=
K
A
Explanation:
K
increases as

v

increases; therefore,
K
E
> K
D
> K
C
> K
B
> K
A
.
004 (part 3 of 5) 2.0 points
Consider the system of the comet plus the
star.
Which of the following statements are
correct?
List all that apply, separated by
commas. If none apply, enter “none”.
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 Fall '08
 Turner
 Energy, Kinetic Energy, Potential Energy, Correct Answer, Ri

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