# Principles of engineering mechanics

Engineering plays a vital part in shaping our lives today. Everything we touch and do is directly or indirectly influenced by mechanical engineering, which is the oldest and broadest of all engineering fields. In order to excel in mechanical engineering, thorough understanding of statics, dynamics, thermodynamics, fluid dynamics, materials science, and structural analysis is essential. By completing this case study, you will demonstrate that you have acquired key fundamental concepts in statics, dynamics and thermodynamics needed to tackle and solve advanced engineering problems in your future engineering studies. Completion of this assignment will address the following learning outcomes: LO1 Explain the fundamental concepts and principles of engineering mechanics. LO2 Apply basic principles of solid mechanics, including statics and dynamics. LO3 Demonstrate an understanding of the physical processes which govern thermodynamic phenomena. LO4 Define a range of engineering material properties. LO5 Carry out experimental and practical activities to investigate and apply the basic concepts of mechanical engineering.

The bimetallic strip consists of two different materials with different expansion co-efficient. Briefly explain the working principles of bimetallic strip and identify an application where they uses bimetallic strip as a part of system. [8] b. The glass in a single –glazed window of an office is replaced with a double-glazed window. The single – glazed and double-glazed window panes are 6 mm thick and have a thermal conductivity of 0.8 W m-1 K-1. The heat transfer co-efficient on the room – side surface of the glass and glass surface exposed to the outside is 7.2 W m-2 K-1 and 13.5 W m-2 K-1 respectively. Air fills the gap between the panes of the double – glazed window. The convective heat transfer co-efficient of air-filled glass surfaces is 4 W m-2 K-1. If the room temperature is 22°C and the out-side temperature is -2°C. Compare the rate of heat-loss per unit area through single-glazed and double-glazed window. [14] c. Heat can be transferred from one place to another by different methods. Briefly explain the difference in heat transfer method between cooling a cup of coffee and heating up a room by an electric fan heater. [8]

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