alexander (jra2623) – oldhomework 25 – Turner – (92510)
1
This
printout
should
have
10
questions.
Multiplechoice questions may continue on
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before answering.
001
(part 1 of 2) 10.0 points
A 0
.
66 kg physics book with dimensions of
30
.
8 cm by 15
.
8 cm is on a table.
What force does the book apply to the
table? The acceleration of gravity is 9
.
8 m
/
s
2
.
Correct answer: 6
.
468 N.
Explanation:
Let :
m
= 0
.
66 kg
and
g
= 9
.
8 m
/
s
2
.
The force is
F
=
m g
= (0
.
66 kg) (9
.
8 m
/
s
2
)
=
6
.
468 N
.
002
(part 2 of 2) 10.0 points
What pressure does the book apply?
Correct answer: 132
.
911 Pa.
Explanation:
Let :
ℓ
= 30
.
8 cm
and
w
= 15
.
8 cm
.
The pressure is
P
=
F
A
=
F
ℓ w
=
6
.
468 N
(30
.
8 cm) (15
.
8 cm)
·
parenleftbigg
100 cm
1 m
parenrightbigg
2
=
132
.
911 Pa
.
003
10.0 points
When an air bubble rises in water, what hap
pens to its mass, volume, and density?
1.
Density doesn’t change; mass and volume
increase.
2.
Mass doesn’t change; volume increases
and density decreases.
correct
3.
Density doesn’t change; mass and volume
decrease.
4.
Volume
doesn’t
change;
mass
and
desnisty increase.
5.
Volume doesn’t change; mass and density
decrease.
6.
Mass doesn’t change; volume decreases
and density increases.
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 Summer '08
 Kaplunovsky
 Buoyancy, Work, Correct Answer

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