A jet of water squirts out horizontally from a hole near the bottom of the tank, as seen in the figure.
a) Assume that x = 1.48 m and y = 1.85 m. What is the speed of the
water coming out of the hole?
b) If the hole has a diameter of 3.97 mm, then what is the height, h, of the water level in the tank?
Given that
The horizontal distance (x) =1.48m
The vertical height (y)=1.85m
The diameterof the hole (d) =3.97mm =0.00397m
Acceleration due to gravity (g) =9.81m/s2
The time for which the water coming from the hole is given by
s =ut+(1/2)at2
y =(1/2)at2
time (t) =Sqrt(2y/a) =Sqrt(2*1.85/9,81) =0.614s
Now horizontal exit velocity of the water from the hole is (vx) =x/t =1.48m/0.614s=2.410m/s
b)
Now from the Bernoullis law at the bottom and tank surface level
we have
P + (1/2)ρv02 + ρgh = P + (1/2)ρvx2 + ρgh
P + (1/2)ρ(0)2 + ρgh = P + (1/2)ρvx2 + ρg(0m)
gh =(1/2)vx2
h =vx2/2g =(2.410m/s)2/2*9.81 =0.296m or 29.60cm
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