Answer:
The maximum length of a surface flaw is 8.24 μm
8.24 μm
Explanation:
Given that:
The modulus of elasticity E = 69 GPa
The specific surface energy
= 0.3 J/m²
The length of the surface flaw "a" = ??
From the theory of the brittle fracture;

Making a the subject of the formula; we have:


a = 8.24 × 10⁻⁶ m
a = 8.24 μm
Thus; the maximum length of a surface flaw is 8.24 μm
Answer:
With increased technological knowledge and consequent decreased factors of ignorance, the structures have less inert masses and therefore less need for such decoration. This is the reason why the modern buildings are plainer and depend upon precision of outline and perfection of finish for their architectural effect.
Answer:
Information technology is important in our lives because it helps to deal with every day's dynamic things. Technology offers various tools to boost development and to exchange information. Both these things are the objective of IT to make tasks easier and to solve many problems.
Answer:
a) Thermal conductivity of skin: 
b) Temperature of interface: 
Heat flux through skin: 
Explanation:
a)

Where:
is thermal conductivity of a material,
is heat flux through a material,
is the thickness of the material,
is the temperature on the first side and
is the temperature on the second side




b)



The heat flux between both surfaces is constant, assuming the temperature is maintained at each surface.








