Here are some Critical Thinking questions I need help answering: 1. Identify an object in your house that contains a physical system and list three questions you could use to define the system.

2. Use the law of thermodynamics to explain why an ice cube melts in a cup of hot tea.

3. The unit states that systems are not only part of engineering, but also other parts of society, such as financial systems, political systems, etc. Could using systems thinking be helpful for these kinds of systems as well? Explain your answer.

4. Why do you think that engineering students are encouraged to think about uses for technology beyond entertaining society?

5. Create a short poem or haiku (a poem with 5 syllables in the first line, 7 syllables in the second, and 5 in the third) to explain a problem you are currently trying to solve. Do not use more than 20 words to express the problem.

A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?

Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?

A)-explain briefly the importance of standards in engineering design. b)- what is patent? c)-explain the relationship between these standards: b.s. and b.s.en d)- in engineering design concepts, types of loads and how they act are important factors. explain.