Fall $2024($ENGI$3440-58)$ THERMOFLUIDS

Activity $2$

Two bodies, A and $B,$ are placed in a room. Body A has a temperature of $25C,$ and Body B has a temperature of $25C.$ A third body, $C,$ is introduced, which is in thermal equilibrium with Body A$.$ Based on this scenario, what can be inferred about the relationship between the temperatures of Bodies B and C according to the principles of thermodynamics? $(1$ point$)$

A determination of temperature is recorded as $37C.$ You are required to convert this temperature to the Kelvin scale. Explain how the Kelvin scale is related to the Celsius scale and provide the converted temperature in Kelvin. $(1$ point$)$

A temperature change of $30$ degrees is recorded in Celsius. Convert this temperature change to the Kelvin scale and explain how temperature changes are treated in both Celsius and Kelvin scales. $(1$ point$)$

Two systems, A and B$,$ with different temperatures and energy contents, are brought into contact. Determine the direction of heat transfer between the two systems. $(1$ point$)$

Explain the difference between gage pressure and absolute pressure. How is each defined relative to atmospheric pressure and an absolute vacuum? Provide examples where each type of pressure measurement might be used. $(1$ point$)$

The pressure in a vacuum chamber is measured using a vacuum gauge, and you are required to determine the absolute pressure within the chamber. Given that the atmospheric pressure is $92$ kPa and the vacuum gauge measures a pressure of $24$ kPa $,$ calculate the absolute pressure inside the chamber. $(2$ point$)$

A submarine is cruising at a specified depth below the water surface. You are required to determine the pressure exerted on the surface of the submarine by the surrounding seawater at this depth. Given that the specific gravity of seawater is $1\mathrm{.}03,$ and the submarine is cruising $91\mathrm{.}44$ meters $(300$ feet$)$ below the free surface of the sea, calculate the absolute pressure at this location in kPa $.$ Note: Suppose that the variation in the density of water with depth is negligible. The density of water $($water$)$ at $0C$ is $1000k\frac{g}{m^3}.(3$ point$)$