Answer:
aluminium is all of isotope with 14 neutrons .
option A Hydrogen will have the greatest rate of effusion beacuse it has the least mass among all
Answer:
The mean velocity is 13 ft/s.
The Reynolds number is 88,583 and it is dimensionless.
Explanation:
We have water flowing in a pipe of 1.05 in diameter.
The density is ρ=62.3 lb/ft and the viscosity is 1.2 cP.
The mean velocity can be calculated as

The Reynolds number now can be calculated for this flow as

being ρ: density, u: mean velocity of the fluid, D: internal diameter of the pipe and μ the dynamic viscosity.
To simplify the calculation, we can first make all the variables have coherent units.
<em>Viscosity</em>

<em>Diameter</em>

Then the Reynolds number is

Answer:
The molecules in a gas have more freedom of movement than molecules in a liquid. Molecules in gas are free to move away from each other, so gas can expand to fill its container.
Explanation: