Question -
Answer -
Area of cross-section of the spray pump, A1 =8 cm2 = 8 × 10–4 m2
Number of holes, n = 40
Diameter of each hole, d = 1 mm = 1 × 10–3 m
Radius of each hole, r = d/2 = 0.5 ×10–3 m
Area of cross-section of each hole, a = πr2 =π (0.5 × 10–3)2 m2
Total area of 40 holes, A2 = n × a
= 40 × π (0.5 × 10–3)2 m2
= 31.41 × 10–6 m2
Speed of flow of liquid inside the tube, V1 =1.5 m/min = 0.025 m/s
Speed of ejection of liquid through the holes = V2
According to the law of continuity, we have:
= 0.633 m/s
Therefore, the speed of ejection of the liquid through the holesis 0.633 m/s.