P15 044

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44.

(a) We use Av = const. The speed of water is

v =

(25.0 cm)

2

(5.00 cm)

2

(25.0 cm)

2

(2.50 m/s) = 2.40 m/s .

(b) Since p +

1
2

ρv

2

= const., the pressure difference is

p =

1

2

ρv

2

=

1

2

(1000 kg/m

3

)[(2.50 m/s)

2

(2.40 m/s)

2

] = 245 Pa .


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