Assuming that Bernoulli's equation applies, compute the volume of water ΔV that flows across the exit of the pipe in 1.00 s . In
1 answer:
Answer:
12.65m³/ sec
Explanation:
The process flow shown in the attachment along with this explanation, with point 2 taken in the liquid at the entrance to the nozzle and point 3 at the exit of the nozzle.
Since A₁ is very large compared to A₂, v₁ ≅ 0. The pressure p₂ is greater tha₁n 1atm (101.3kN/m3) by the head of fluid of Hm. The pressure p₃ which is at point 3 is at 1atm. Using point 2 as a datum, z₂=0 and z₃=0. From bernoulli’s equation
z₂g+ v₂²/2 + p₂/ρ = z₃g+ v₃²/2 + p₃/ρ
we can rearrange the above Bernoulli’s equation as
z₂g+ v₂²/2 + p₂-p₃/ρ = z₃g+ v₃²/2
0+0+p₂-p₃/ρ = 0 + v₃²/2
Solving for v₂
v₃ ⇒ ..........Equation 1
since p₂-p₁ = Hρg and p₁ = p₃ ( both at 1atm)
H = p₂-p₃/ρg
p₂-p₃ = Hρg...............................Equation 2
put Equation 2 into Equation 1
v₃ = .....................Equation 3
v₃ =
The volumetric flowrate in 1.00sec is given as
flow rate = v₃A₃= 12.65×
=0.202m³/sec
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Answer:
Strong nuclear force is 1-2 order of magnitude larger than the electrostatic force
Explanation:
There are mainly two forces acting between protons and neutrons in the nucleus:
- The electrostatic force, which is the force exerted between charged particles (therefore, it is exerted between protons only, since neutrons are not charged). The magnitude of the force is given by
where k is the Coulomb's constant, q1 and q2 are the charges of the two particles, r is the separation between the particles.
The force is attractive for two opposite charges and repulsive for two same charges: therefore, the electrostatic force between two protons is repulsive.
- The strong nuclear force, which is the force exerted between nucleons. At short distance (such as in the nucleus), it is attractive, therefore neutrons and protons attract each other and this contributes in keeping the whole nucleus together.
At the scale involved in the nucleus, the strong nuclear force (attractive) is 1-2 order of magnitude larger than the electrostatic force (repulsive), therefore the nucleus stays together and does not break apart.