Copy of 5BL Lab 1 Assignment Submission Template - W24v2

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School

University of California, Los Angeles *

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Course

5BL

Subject

Mechanical Engineering

Date

Apr 3, 2024

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pdf

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Uploaded by DrEel402

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±ctivity 1 Response : Measure the temperature of the environment (ambient temperature), the human body (both forehead and under the tongue), and two other objects in the room. Record this information in both and , and group the items into a category of either being in or out of equilibrium with the environment. Using the human body as the system, state the direction of heat flow between the body and the environment and explain why heat flows in this direction. 57=<\UVUN \UVUNACIHlt ZS^_bc_wjs ]VW`a] lt\UVUN TS]VWirVUNJLRQlt]VWbc_`a] bc_ZS lt\UVUN VUN`a]v]VWirbc_`a]_`VUN`a]lt IKQPVUNltwVUNVUN`a] lt\UVUN IKQPbc_TSy ACIH`a]TS lt\UVUN VUN`a]v]VWirbc_`a]_`VUN`a]lt IKQPVUNJLRQACIHujsVUN wACIHir_`VUNir ACIH]VWir ZS^_bc_wjs ltbc_wACIHirTSjs ACIHirVUNACIHjs bc_ZS JLRQbc_^_TSVUNir ACIH]VWir. NOSTS°JVWVVZ[ZZZNOQRQNOEWXWWWNOZ[ZZZRSR \]\\\± JSTS[\[[[RSRYZYYY%!E TUTTZ[ZZZYZYYY°TUTTKL°JVWVVZ[ZZZNOQRQNOEWXWWWNOZ[ZZZRSR \]\\\± JSTS[\[[[RSRYZYYY ²NOSTS TUTTWXWWW TUTTZ[ZZZYZYYY TUTTKL TUTTEOPOJHYZYYY³%!E ACIH_`IKQP]VWVUN`a]lt ltVUN_`ijfVUNirACIHltuirVUN: 70.3°³, 21.27°´ \Uu_`ACIH`a] IKQPbc_TSy-ZSbc_irVUN\UVUNACIHTS: 96.8°³, 36.0°´ (bc_ult) bc_lt\UVUNir bc_IKQP\]VUNJLRQlt- IKQP^_ACIHJLRQ]^ IKQPbc_ACIHirTS: 70.5°³, 21.39°´ bc_lt\UVUNir bc_IKQP\]VUNJLRQlt-JLRQbc__`ijfultVUNir jsJLRQirVUNVUN`a]: 82.4°³, 28°´ (bc_ult) \Uu_`ACIH`a] IKQPbc_TSy-ltbc_`a][TuVUN:98.4°³, 36.89°´ (bc_ult)

±ctivity 2 Response: Use the °R temperature gun to measure the temperature of your hands both before and after vigorously rubbing them together. ²ompare the temperature difference (if any) before and after, and relate this to how the temperature change is providing information about how energy is changing form. Record how long it takes for your hands to get back to thermal equilibrium, and explain how this occurs. 57=<VUN_`ijfVUNirACIHltuirVUN bc_ZS \UACIH`a]TSjs IKQPVUNZSbc_irVUN iruIKQPIKQP]VW`a][T: 91.7 °³ 57=<VUN_`ijfVUNirACIHltuirVUN bc_ZS \UACIH`a]TSjs ACIHZSltVUNir iruIKQPIKQP]VW`a][T: 94.2 °³ µ]VWZSZSVUNirVUN`a]JLRQVUN ]VW`a] ltVUN_`ijfVUNirACIHltuirVUN: 2.5 °³ 57=<\UVUN ltVUN_`ijfVUNirACIHltuirVUN ]VW`a]JLRQirVUNACIHjsVUN ]VW`a]TS]VWJLRQACIHltVUNjs lt\UACIHlt VUN`a]VUNir[Ty ]VWjs JLRQ\UACIH`a][T]VW`a][T ZSbc_ir_` ZSirbc__` _`VUNJLRQ\UACIH`a]]VWJLRQACIH^_ VUN`a]VUNir[Ty ltbc_ lt\UVUNir_`ACIH^_ VUN`a]VUNir[Ty. ¶lt ltbc_bc_]^ ACIHIKQPbc_ult 1.5 _`]VW`a]js ZSbc_ir _`y \UACIH`a]TSjs ltbc_ [TVUNlt IKQPACIHJLRQ]^ ltbc_ lt\UVUNir_`ACIH^_ VUNlhqu]VW^_]VWIKQPir]VWu_`. 57=<\UVUN ltVUN_`ijfVUNirACIHltuirVUN irVUNltuir`a]js ltbc_ lt\UVUNir_`ACIH^_ VUNlhqu]VW^_]VWIKQPir]VWu_` IKQPVUNJLRQACIHujsVUN lt\UVUN VUN`a]v]VWirbc_`a]_`VUN`a]lt ACIH`a]TS _`y \UACIH`a]TSjs JLRQACIH`a] ZSirVUNVUN^_y VUNxJLRQ\UACIH`a][TVUN VUN`a]VUNir[Ty.

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±ctivity 3 Response: ±s an investigation of scientific question ³, consider an object that is not the human body, but that also has a consistently higher temperature than the environment. ³ased on your results from activity 2, describe how you would expect its thermal energy and temperature to change with time. ´ow is it able to stay at a hotter temperature than the surroundings, even though heat is constantly flowing? ·`a]VUNir[Ty ]VWjs JLRQbc_`a]jsltACIH`a]lt^_y IKQPVUN]VW`a][T ltirACIH`a]jsZSVUNirirVUNTS IKQPVUNltwVUNVUN`a] lt\UVUN IKQPbc_TSy ACIH`a]TS lt\UVUN VUN`a]v]VWirbc_`a]_`VUN`a]lt IKQPVUNJLRQACIHujsVUN lt\UVUN IKQPbc_TSy ACIH`a]TS lt\UVUN VUN`a]v]VWirbc_`a]_`VUN`a]lt ACIHirVUN `a]bc_lt ]VWjsbc_^_ACIHltVUNTS VUNACIHJLRQ\U bc_lt\UVUNir. 57=<\UVUN IKQPbc_TSy ]VWjs ACIHIKQP^_VUN ltbc_ _`ACIH]VW`a]ltACIH]VW`a] ACIH \U]VW[T\UVUNir ltVUN_`ijfVUNirACIHltuirVUN lt\UACIH`a] lt\UVUN VUN`a]v]VWirbc_`a]_`VUN`a]lt IKQPVUNJLRQACIHujsVUN wbc_ir]^ (ACIH ZSbc_ir_` bc_ZS VUN`a]VUNir[Ty) ]VWjs IKQPVUN]VW`a][T ]VW_`ijfultVUNTS ]VW`a]ltbc_ lt\UVUN jsyjsltVUN_`. ¶ZS lt\UVUN IKQPbc_TSy wACIHjs `a]bc_ ^_bc_`a][TVUNir [TVUN`a]VUNirACIHlt]VW`a][T \UVUNACIHlt, ]VWltjs ltVUN_`ijfVUNirACIHltuirVUN wbc_u^_TS VUNlhquACIH^_]VWzVUN w]VWlt\U lt\UVUN jsuirirbc_u`a]TS]VW`a][Tjs IKQPVUNJLRQACIHujsVUN bc_ZS lt\UVUN VUN`a]VUNir[Ty ltirACIH`a]jsZSVUNir. µiven that energy is conserved when considering an entire system, what is the energy flow process throughout the entire system that allows the hot object to stay hot? Now, relate this to the temperature measurements taken of the human body, and explain how our human body is able to consistently maintain a hotter temperature than the environment. ² \Ubc_lt bc_IKQP\]VUNJLRQlt ]VWjs ACIHIKQP^_VUN ltbc_ jsltACIHy \Ubc_lt IKQPy ult]VW^_]VWz]VW`a][T VUN`a]VUNir[Ty ]VW`a]ijfultjs ZSirbc__` lt\UVUN VUN`a]v]VWirbc_`a]_`VUN`a]lt. 57=<\UVUN [TVUN`a]VUNirACIHltVUNTS VUN`a]VUNir[Ty bc_ZSZSjsVUNltjs lt\UVUN VUNlhquACIH^_]VWz]VW`a][T ZS^_bc_w bc_ZS \UVUNACIHlt IKQPVUNltwVUNVUN`a] lt\UVUN VUN`a]v]VWirbc_`a]_`VUN`a]lt ACIH`a]TS lt\UVUN IKQPbc_TSy. 57=<\UVUN \Uu_`ACIH`a] IKQPbc_TSy TSbc_VUNjs lt\U]VWjs IKQPy ltuir`a]]VW`a][T ZSbc_bc_TS jsbc_uirJLRQVUNjs ]VW`a]ltbc_ lt\UVUNir_`ACIH^_ VUN`a]VUNir[Ty ltbc_ ACIH^_^_bc_w ]VWlt ltbc_ jsltACIHy ACIHlt ACIH jsltACIHIKQP^_VUN ltVUN_`ijfVUNirACIHltuirVUN ACIHirbc_u`a]TS 98.6 ³. &(.y IKQPbc_TSy ltVUN_`ijfVUNirACIHltuirVUN ¶ irVUNJLRQbc_irTSVUNTS ]VW`a] lt\UVUN ^_ACIHIKQP wACIHjs ACIHirbc_u`a]TS lt\U]VWjs ltVUN_`ijfVUNirACIHltuirVUN IKQPVUNJLRQACIHujsVUN ¶ ACIH_` `a]bc_lt js]VWJLRQ]^.

±ctivity 4 Response: Use either a human body, electronic devices, and/or light bulbs to capture two (2) images with the ¶!L°R device that each indicate a difference in temperature between two or more objects. ²apture the ¶!L°R images with your phone camera and paste them here. ¶or each image: ·escribe the heat flow between different objects visible, and indicate how these temperature differences were created and/or maintained by energy changing forms. !Label the hottest/coolest objects in your images. (°f necessary, provide additional diagrams to supplement your explanations for clarity.) ¸VUNACIHlt ZS^_bc_wjs bc_ult bc_ZS lt\UVUN irVUN^_ACIHlt]VWvVUN^_y wACIHir_`VUNir ACIHirVUNACIHjs ltbc_wACIHirTSjs lt\UVUN irVUN^_ACIHlt]VWvVUN^_y JLRQbc_bc_^_VUNir ACIHirVUNACIHjs. 57=<\UVUN ³!%'¶35; JLRQACIH_`VUNirACIHjs TSVUNijf]VWJLRQlt wACIHir_`VUNir ACIHirVUNACIHjs ]VW`a] wACIHir_`VUNir ltbc_`a]VUNjs ^_]VW]^VUN irVUNTS ACIH`a]TS bc_irACIH`a][TVUN ACIH`a]TS JLRQbc_bc_^_VUNir ACIHirVUNACIHjs ]VW`a] JLRQbc_bc_^_VUNir ltbc_`a]VUNjs ^_]VW]^VUN ijfuirijf^_VUN ACIH`a]TS IKQP^_uVUN. ¶`a] lt\UVUN ]VW_`ACIH[TVUN bc_`a] lt\UVUN ^_VUNZSlt, \UVUNACIHlt ]VWjs ZS^_bc_w]VW`a][T ZSirbc__` lt\UVUN \UACIH`a]TS (wACIHir_`) bc_ultwACIHirTS ltbc_ lt\UVUN VUN`a]v]VWirbc_`a]_`VUN`a]lt (JLRQbc_^_TS) ¶`a] lt\UVUN ]VW_`ACIH[TVUN bc_`a] lt\UVUN ir]VW[T\Ult, \UVUNACIHlt ]VWjs ZS^_bc_w]VW`a][T ZSirbc__` lt\UVUN _`bc_`a]]VWltbc_ir (wACIHir_`) bc_ultwACIHirTS ltbc_ lt\UVUN VUN`a]v]VWirbc_`a]_`VUN`a]lt (JLRQbc_^_TS).