Answer:
L=31.9 mm
δ = 0.22 mm
Explanation:
Given that
v= 14 m/s
ρ=997 kg/m³
μ= 0.891 × 10⁻3 kg/m·s
As we know that when Reynolds number grater than 5 x 10⁵ then flow will become turbulent.
L=0.0319 m
L=31.9 mm
The thickness of the boundary layer at that location L given as
δ = 0.00022 m
δ = 0.22 mm
Helium exhibits more visible emission lines or spectral lines than hydrogen is due to the fact that helium has two electrons compared to hydrogen which only has one electron. The greater the chance of the energy levels falling within the visible range when there's more energy level. Spectral lines are usually the result of the interaction of quantum system, usually atoms but can also be the molecules or the atomic nuclei sometimes together with a single photon. Whenever photon has the right amount of energy in order to allow changes in energy state, the system, or the electron changing orbitals will absorbed the photon, then will be emitted whether in same frequency with the original of in cascade.
If we started mining asteroids, we wouldn't have to carry so much fuel around. We'd be able to go further than we've ever imagined. We'd mine asteroids for water ice to get water – an essential element for sustaining human life anywhere in space.
Hey There!
The law of conservation of momentum is "For a collision between object 1 and object 2 in an isolated system, the total momentum of the two objects before the collision is equal to the total momentum of the two objects after the collision"
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