Sln-Quiz#2

Given the following situations, tell whether it applies the first law of thermodynamics or second law of thermodynamics. Draw a smiley face if applies the first law and a heart if it applies the second law. 1. Food digestion 2. Rusting of iron 3. Photosynthesis 4. Using aircon during summer 5. Simple motor 6. Growing younger 7. Plugging TV to watch a program 8. Riding a bicycle 9. Generator 10. Heat flows from lower to higher temperature

Thermodynamics. please answer the 2 questionn, i will give a good feedback. thank you,  show solution step by step.

Thermodynamics 1 Pls answer asap thankyou

(Thermodynamics)(True or False) A steady-flow system can involve boundary work.

4. (2)

Subject: Thermodynamics I

4) Figure shows a gas contained in a vertical piston-cylinder assembly. The total mass of the piston (including shaft) is 100 kg. While the gas is slowly heated, the internal energy of the gas increases by 0.1 kJ, the potential energy of the piston-shaft combination increases by 0.2 kJ. The piston and cylinder are poor conductors, and friction between them is negligible. The local atmospheric pressure is 1 bar and approximate g as 10 m/s². The cross-sectional area of the piston is 0.01 m². Determine, (a) the work done by the gas, (b) the heat transfer to the gas, all in kJ. Patm = 1 bar Gas 0.01 m²

Derive the seven general property equation of the following thermodynamics processes:   a. POLYTROPIC PROCESS

1. A gas within a piston-cylinder assembly undergoes a thermodynamic cycle consisting of three processes: Process 1-2: Compression with PV = constant, from P₁ = 1 bar, V₁ = 2 m³ to V₂ = 0.2 m³, U₂ − U₁ = 100 kJ; 2 Process 2-3: Constant volume to P3 = P₁; Process 3-1: Constant-pressure and adiabatic process. Neglect the changes of kinetic and potential energy in all three processes. (a) Sketch the cycle on a P-V diagram; (b) Determine the net work (i.e., W12 + W23 + W31) of the cycle, in kJ; (c) Determine the heat transfer for process 2-3, in kJ. Hint: System's state variables remain unchanged after a cycle, i.e. (U₂ − U₁) + (U3 − U₂) + (U₁ − U3) = 0

A closed system undergoes a thermodynamic cycle with 2 steps: process 1-2 (from state 1 to state 2), process 2-1 (from state 2 to state 1). During process 1-2, the system received energy by heat transfer of 25J. During process 2-1, energy was transferred from the system to its surrounding by heat transfer of 15J. This is a power cycle. True False

Thermodynamics

Topic: Understanding the World of Thermodynamics   1.) Give an example each of an isolated, closed and an open systems. Explain how you classified the systems.