13.66. Set Up:
Apply Newton’s second law to the beaker, liquid and block as a combined object and
also to the block as a single object. Take
upward.
Solve:
Forces on the combined object:
D
and
E
read
mass rather than weight, so write the equation as
is the reading in kg of
scale
D
; a similar statement applies to
Forces on
A
:
(b)
D
reads the mass of
A
: 8.20 kg.
E
reads the total mass of
B
and
C
: 2.80 kg.
13.67. Set Up:
The density of gold is
and the density of aluminum is
Solve:
Find the volume
of the ingot:
The mass of the ingot is
The total mass is the mass of gold,
plus the mass of aluminum,
The total volume is the volume of gold,
plus the volume of aluminum,
Reflect:
If the ingot had the same weight in air (45.0 N) and was pure gold, its volume would be
and the balance would read 42.7 N when the ingot was submerged.
13.68. Set Up:
The pressure at the surface of the earth is
The height of fluid in the barometer
is related to air pressure
p
by
Solve: (a)
(b)
13.69. Set Up:
Apply
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.
 Spring '07
 Shoberg
 Force

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