Answer:
True
Explanation:
It could either be true or false because you dont really have to be great at something just to do it, you could try new things too.
Answer:
Ceramics
Explanation:
Ceramics are used to make cooktops if you look it up and according to my engineering and design class ceramics have high heat resistance and melting points, and make good electrical insulators.
to take a picture just choose “take photo” on the button next to the keypad, if you are on a computer it’s the same thing if your computer has a video screener or whatever they call it but if not I’m not sure, hope this helps!
Answer:
A) i) 984.32 sec
ii) 272.497° C
B) It has an advantage
C) attached below
Explanation:
Given data :
P = 2700 Kg/m^3
c = 950 J/kg*k
k = 240 W/m*K
Temp at which gas enters the storage unit = 300° C
Ti ( initial temp of sphere ) = 25°C
convection heat transfer coefficient ( h ) = 75 W/m^2*k
<u>A) Determine how long it takes a sphere near the inlet of the system to accumulate 90% of the maximum possible energy and the corresponding temperature at the center of sphere</u>
First step determine the Biot Number
characteristic length( Lc ) = ro / 3 = 0.0375 / 3 = 0.0125
Biot number ( Bi ) = hLc / k = (75)*(0.0125) / 40 = 3.906*10^-3
Given that the value of the Biot number is less than 0.01 we will apply the lumped capacitance method
attached below is a detailed solution of the given problem
<u>B) The physical properties are copper</u>
Pcu = 8900kg/m^3)
Cp.cu = 380 J/kg.k
It has an advantage over Aluminum
C<u>) Determine how long it takes a sphere near the inlet of the system to accumulate 90% of the maximum possible energy and the corresponding temperature at the center of sphere</u>
Given that:
P = 2200 Kg/m^3
c = 840 J/kg*k
k = 1.4 W/m*K
Answer:
t = 1456.8 sec
Explanation:
given data:
contant k = 2.60*10^{-6}
rate of crystallization is 0.0013 s-1
rate of transformation is given by

use specifies value to solve 
it is ime required for 50% tranformation

Avrami equation is given by






n = 1.88
second degree of recrystalization may be determine by rearranging original avrami equation
![t = [\frac{-ln(1-y)}{k}]^{1/n}](https://tex.z-dn.net/?f=t%20%3D%20%5B%5Cfrac%7B-ln%281-y%29%7D%7Bk%7D%5D%5E%7B1%2Fn%7D)
for 90%completion
![t = [\frac{-ln(1-0.9)}{2.60*10^{-6}}]^{1/1.88}](https://tex.z-dn.net/?f=t%20%3D%20%5B%5Cfrac%7B-ln%281-0.9%29%7D%7B2.60%2A10%5E%7B-6%7D%7D%5D%5E%7B1%2F1.88%7D)
t = 1456.8 sec