Explain why the pumping lemma won't work on the following languages (i. e., show where it fails - it's already obvious they're regular because the first 2 are finite and the last 2 are regular expressions):

i) The empty set
ii) {00,11}
iii) (00+11)*
iv) 01*01*

The y form of iron is known as: a) ferrite b) cementite c) perlite d) austenite

An air conditioning system consist of a 5 cm diameter pipe, operating at a pressure of 200 kpa. the air initially enters the pipe at 15°c with a velocity of 20 m/s and relative humidity of 80%. if the heat supply throughout the process is 960 w, determine the relative humidity and the temperature at the outlet

Explain in your own word the concept of a solid solution, in alloys, and how it can be created.