Gizmo force and fan carts
can someone help please?
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Ответ:
t = 0.719 s
Explanation:
For this fluid mechanics exercise, let's use Bernoulli's equation.
We are going to use index 1 for the liquid in the glass and index 2 for the liquid in the mouth
P1 + ρ g y1 = P2 + ρ g y2
the speed of exit of the lemonade is small or equal in the two points.
The pressure in the glass is atmospheric pressure and the pressure in the mouth is p₂ - 0.75 atm
Atmospheric pressure P_atm = 1 10⁵ P
ρg (y₂-y₁) = P₁ - P₂
Δy = (P₁ - P₂) / ρ g
Δy = (1 - 0.75) 1 10⁵ / (1008 9.8)
Δy = 2.53 m
This is the maximum length of the cigarette
to calculate the time we assume that the speed in the glass is very small, let's use Newton's second law
F = m a
P = F V
the volume is
V = A Δy
P A = (ρ A Δy) a
a = P /(ρ Δy)
a = 0.25 1 105 / (1008 2.53)
a = 9.8 m /s²
now with the accelerated we can use the kinematic relations to find the time
y = y₁ t + ½ a t²
v₁= 0
y = √ 2y / a
y =√ AR (2 2.53 / 9.8)
t = 0.719 s