Answer:
t = 56.6 min
Explanation:
Fick's second law is used to calculate time required for diffusion
where
= 1.15%
= 0.18%
= 0.35%
x = 0.40 mm = 0.0004 n
therefore we ahave
![\frac{1.15-0.35}{1.15- 0.18} = erf[\frac{4\times 10^{-4}}{2\sqrt{1.28\times 10^{-11} t}}]](https://tex.z-dn.net/?f=%5Cfrac%7B1.15-0.35%7D%7B1.15-%200.18%7D%20%3D%20%20erf%5B%5Cfrac%7B4%5Ctimes%2010%5E%7B-4%7D%7D%7B2%5Csqrt%7B1.28%5Ctimes%2010%5E%7B-11%7D%20t%7D%7D%5D)
![0.8247 = erf [\frac{55.90}{\sqrt{t}}] = erf z](https://tex.z-dn.net/?f=0.8247%20%3D%20erf%20%5B%5Cfrac%7B55.90%7D%7B%5Csqrt%7Bt%7D%7D%5D%20%3D%20%20erf%20z)
from error function table we hvae following result
for erf z z
0.8209 0.95
0.8247 x
0.8427 1
therefore
x = 0.959
thus
t = 56.6 min
Answer:
Explanation:
- <u>Atomization using gas stream</u>
Molten metal is forced through a small orifice and is shatter by a jet of compressed air,inert gas .
In Atomization, the particles shape is analysed by the rate of solidification and varies from spherical to highly irregular shape.
oxide of metals are transformed to pure metal powder when undefended to under melting point gases results in a product of spongy material.
It is used for Iron,copper,tungsten,Nickel etc.
Answer:
1) the final temperature is T2 = 876.76°C
2) the final volume is V2 = 24.14 cm³
Explanation:
We can model the gas behaviour as an ideal gas, then
P*V=n*R*T
since the gas is rapidly compressed and the thermal conductivity of a gas is low a we can assume that there is an insignificant heat transfer in that time, therefore for adiabatic conditions:
P*V^k = constant = C, k= adiabatic coefficient for air = 1.4
then the work will be
W = ∫ P dV = ∫ C*V^(-k) dV = C*[((V2^(-k+1)-V1^(-k+1)]/( -k +1) = (P2*V2 - P1*V1)/(1-k)= nR(T2-T1)/(1-k) = (P1*V1/T1)*(T2-T1)/(1-k)
W = (P1*V1/T1)*(T2-T1)/(1-k)
T2 = (1-k)W* T1/(P1*V1) +T1
replacing values (W=-450 J since it is the work done by the gas to the piston)
T2 = (1-1.4)*(-450J) *308K/(101325 Pa*650*10^-6 m³) + 308 K= 1149.76 K = 876.76°C
the final volume is
TV^(k-1)= constant
therefore
T2/T1= (V2/V1)^(1-k)
V2 = V1* (T2/T1)^(1/(1-k)) = 650 cm³ * (1149.76K/308K)^(1/(1-1.4)) = 24.14 cm³
Answer:
Engineering is the use of scientific principles to design an build machines, structure, an other item including bridges, tunnels, road etc
Answer:
Gravitational; strongest; facing; closer; near side; toward.
Explanation:
The gravitational attraction between the Earth and the moon is strongest on the side of the Earth that happens to be facing the moon, simply because it is closer. This attraction causes the water on this “near side” of Earth to be pulled toward the moon. These forces of attraction and inertia tends to keep the water in place and consequently, leads to a bulge of water on the near side with respect to the moon.
Also, you should note that what is responsible for the moon being in orbit around the Earth is the gravitational force of attraction between the two planetary bodies (Earth and Moon).
