1. Selena uses a garden hose to fill a bucket of water. The water enters the hos
ID: 1730518 • Letter: 1
Question
1. Selena uses a garden hose to fill a bucket of water. The water enters the hose through a faucet with a 6.0-cm diameter. The speed of the water at the faucet is 5 m/s. If the faucet and the nozzle are at the same height, and the water leaves the nozzle with a speed of 20 m/s, what is the diameter of the nozzle? 2. Oil (p- 925 kg/m) is flowing through a pipeline at a constant speed when it encounters a vertical bend in the pipe raising it 4.0 m. The cross sectional area of the pipe does not change. What is the difference in pressure (PB-PA) in the portions of the pipe before and after the rise?Explanation / Answer
1. Q = A1 v1 = A2 v2
(pi D1^2 / 4) v1 = (pi D2^2 / 4) v2
(6^2)(5 m/s) = (D^2)(20)
D = 3 cm .....Ans
2. from Bernoulli's equation,
delta(P) = rho g h
= 925 x 9.8 x 4
= 36260 Pa
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