Question

Water is moving with a speed of 5.18 ms^–1 through a pipe with a cross-sectional area of 4.20 cm². The water gradually descends 9.66 m as the pipe increase in area to 7.60 cm². The speed of flow at the lower level is

• A. (a) 3.0 ms^–1
• A. (b) 5.7 ms^–1
• A. (c) 3.82 ms^–1
• A. (d) 2.86 ms^–1

Answer 1

(d)

$a _ { 1 } v _ { 1 } = a _ { 2 } v _ { 2 }$

⇒ $4.20 \times 5.18 = 7.60 \times v _ { 2 } \Rightarrow v _ { 2 } = 2.86 \mathrm {~m} / \mathrm { s }$