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
a
lotion at
27°c
skin at
37°c
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

Explanation:

Step1: Recall heat flow principle

Heat flows from hotter object to colder object.

Step2: Analyze Scenario A

Skin at \(37^{\circ}C\) (hotter) and lotion at \(27^{\circ}C\) (colder). So heat flows from skin to lotion.

Step3: Analyze Scenario B

Lasagna at \(170^{\circ}C\) (hotter) and plate at \(20^{\circ}C\) (colder). So heat flows from lasagna to plate.

Step4: Analyze Scenario C

Lava at \(950^{\circ}C\) (hotter) and ocean water at \(25^{\circ}C\) (colder). So heat flows from lava to ocean water.

Step5: Analyze Scenario D

Sidewalk at \(80^{\circ}C\) (hotter) and eggs at \(2^{\circ}C\) (colder). So heat flows from sidewalk to eggs.

Answer:

Scenario A: Skin to Lotion
Scenario B: Lasagna to Plate
Scenario C: Lava to Ocean water
Scenario D: Sidewalk to Eggs