Question

identifying direction of heat flow
indicate the direction of heat flow in each scenario.
scenario a:
scenario b:
scenario c:
scenario d:

scenario	object 1	object 2
b	lasagna at 170°c	plate at 20°c
c	ocean water at 25°c	lava at 950°c
d	eggs at 2°c	sidewalk at 80°c

toward object 1
toward object 2

Explanation:

Step1: Recall heat - flow principle

Heat flows from higher - temperature object to lower - temperature object.

Step2: Analyze Scenario A

Skin ($37^{\circ}C$) is at a higher temperature than lotion ($27^{\circ}C$), so heat flows toward object 1 (lotion).

Step3: Analyze Scenario B

Lasagna ($170^{\circ}C$) is at a higher temperature than the plate ($20^{\circ}C$), so heat flows toward object 2 (plate).

Step4: Analyze Scenario C

Lava ($950^{\circ}C$) is at a much higher temperature than ocean water ($25^{\circ}C$), so heat flows toward object 1 (ocean water).

Step5: Analyze Scenario D

Sidewalk ($80^{\circ}C$) is at a higher temperature than eggs ($2^{\circ}C$), so heat flows toward object 1 (eggs).

Answer:

Scenario A: toward object 1
Scenario B: toward object 2
Scenario C: toward object 1
Scenario D: toward object 1