3.
Strategy
Use the definition of average pressure.
Solution
Compute the average pressure on the soles of the feet.
av
2
(90.0 kg)(9.80 N kg)
22 kPa
2(0.020 m
)
F
mg
P
A
A
=
=
=
=
8.
Strategy
The pressure increases by an amount equal to the force divided by the crosssectional area
of the piston.
Solution
Compute the pressure increase.
5
2
4.40 N
88.0 kPa
5.00
10
m
F
P
A
−
Δ
=
=
=
×
14.
Strategy
Since
d
is depth,
d
−
is height. Use Eq. (94).
Solution
Find the height that water can be sucked up a straw.
atm
atm
3
3
2
10 kPa
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 Winter '08
 REHSE
 Physics, Force, average pressure, Solution Compute

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