Here are the questions you need to answer for this assignment. After reading the questions carefully, pick arbitrary numbers to
1 answer:
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Answers:
(a)
(b) Volume gold: , Volume cupper:
(c)
Explanation:
<h2>(a) Mass of gold </h2><h2 />We are told the total mass of the coin, which is an alloy of gold and copper is:
(1)
Where is the mass of gold and
is the mass of copper.
In addition we know it is a 22-karat gold and the relation between the number of karats and mass is:
(2)
Finding :
(3)
(4)
(5) This is the mass of gold in the coin
The density of an object is given by:
If we want to find the volume, this expression changes to:
For gold, its volume will be a relation between its mass
(found in (5)) and its density
:
(6)
(7)
(8) Volume of gold in the coin
For copper, its volume will be a relation between its mass
and its density
:
(9)
The mass of copper can be found by isolating from (1):
(10)
Knowing the mass of gold found in (5):
(11)
Now we can find the volume of copper:
(12)
(13) Volume of copper in the coin
Remembering density is a relation between mass and volume, in the case of the coin the density will be a relation between its total mass
and its total volume
:
(14)
Knowing the total volume of the coin is:
(15)
(16)
Finally:
(17) This is the total density of the British sovereign coin
Answer:
&
Explanation:
Given:
- interior temperature of box,
- height of the walls of box,
- thickness of each layer of bi-layered plywood,
- thermal conductivity of plywood,
- thickness of sandwiched Styrofoam,
- thermal conductivity of Styrofoam,
- exterior temperature,
<u>From the Fourier's law of conduction:</u>
....................................(1)
<u>Now calculating the equivalent thermal resistance for conductivity using electrical analogy:</u>
.....................(2)
Putting the value from (2) into (1):
is the heat per unit area of the wall.
The heat flux remains constant because the area is constant.
<u>For plywood-Styrofoam interface from inside:</u>
&<u>For Styrofoam-plywood interface from inside:</u>
Answer:
Explanation:
Given
n=5
0.3 fraction recrystallize after 100 min
According to Avrami equation
where y=fraction Transformed
k=constant
t=time
Taking log both sides
At this Point we want to compute
taking log both sides
Rate of Re crystallization at this temperature