Answer:
Its B). The efficiency rating of the dishwasher was significantly improved, meaning it would save him money and be more eco-friendly.
Explanation:
On EDG
B) Oxygen combines with nitrogen in the air to form NOx at about 2500 degrees Fahrenheit.
(a) The number of vacancies per cubic centimeter is 1.157 X 10²⁰
(b) ρ = n X (AM) / v X Nₐ
<u>Explanation:</u>
<u />
Given-
Lattice parameter of Li = 3.5089 X 10⁻⁸ cm
1 vacancy per 200 unit cells
Vacancy per cell = 1/200
(a)
Number of vacancies per cubic cm = ?
Vacancies/cm³ = vacancy per cell / (lattice parameter)³
Vacancies/cm³ = 1 / 200 X (3.5089 X 10⁻⁸cm)³
Vacancies/cm³ = 1.157 X 10²⁰
Therefore, the number of vacancies per cubic centimeter is 1.157 X 10²⁰
(b)
Density is represented by ρ
ρ = n X (AM) / v X Nₐ
where,
Nₐ = Avogadro number
AM = atomic mass
n = number of atoms
v = volume of unit cell
Answer:
the heat transfer from the pipe will decrease when the insulation is taken off for r₂< ![r_{cr}](https://tex.z-dn.net/?f=r_%7Bcr%7D)
where;
r₂ = outer radius
= critical radius
Explanation:
Note that the critical radius of insulation depends on the thermal conductivity of the insulation k and the external convection heat transfer coefficient h .
![r_{cr} =\frac{k}{h}](https://tex.z-dn.net/?f=r_%7Bcr%7D%20%3D%5Cfrac%7Bk%7D%7Bh%7D)
The rate of heat transfer from the cylinder increases with the addition of insulation for outer radius less than critical radius (r₂<
) 0, and reaches a maximum when r₂ =
, and starts to decrease for r₂<
. Thus, insulating the pipe may actually increase the rate of heat transfer from the pipe instead of decreasing it when r₂<
.