Thermal concepts inventory quiz
Answer the questions in the following sections:
- TCI5
- TCI6
- TCI7
- TCI8
- TCI9
- TCI12
- TCI13
TCI1: Thermal conduction
Figure 1
- Text:
- "Feel": Temperature sensor? What do we feel? The temperature of the finger
- "Quickly": No time for thermal equilibrium
- "Same material" => same material properties:
- specific heat capacity, \( c=C/m \)
- thermal conductivity, \( \lambda \)
- Answers:
- Blue: Energy flux \( J_Q\propto \lambda \Delta T \)
- Red: Temperature difference, \( \Delta T \)
- Green: Thermal equilibrium, \( T_{finger}=T_{object} \)
- Yellow: Size: Amount of energy stored \( \propto \) volume (mass). In equilibrium...
TCI2: Thermal equilibrium
Figure 2
- Text
- "for several hours": they have reached thermal equilibrium: $T_{freezer}=T_{ice block}=T_{stick}
- "Immediately": No time for change => the temperatures do not change
- Answers:
- Yellow is correct if immediately=instantaneously
- Green is correct if is correct if "immediately" is long enough to measure change.
TCI3:
Figure 3
Draw the temperature as function of time.
TCI4:
Figure 4
- Text
- "No heating in the floor and no direct sunlight": thermal equilibrium between all objects in the room.
- Answer
- Yellow: "does not store energy well" = ?
- Violet: \( T_1=T_2 \)
TCI5:
Figure 5
- Text
- Answer
- Blue: Why will the hot water rise? Why does it help to replace the hot water?
- Orange: what can "The energy travels up" mean?
TCI6:
Figure 6
- Draw the energy budget of the clouds and the Earth
TCI7: Heat flow and temperature
Figure 7
- Text
- "Add energy to an object": Which 2 ways can you add energy to an object?
- Answer
- Red:
- How does this fit with energy conservation?
- give an example
TCI8:
Figure 8
Try to formalize your arguments with thermal concepts and math
!Split
TCI9:
Figure 9
- What material properties matter here?
- Formalize your arguments with thermal concepts and math.
TCI10:
Figure 10
TCI11:
Figure 11
TCI12:
Figure 12
If the temperature rises:
- what do we call the shaking?
- what is the process that causes heating?
TCI13:
Figure 13
- red: The temperature of the metal lid rises faster, causing the metal lid to expand faster than the glass jar.
- yellow: Metal expands more than glass for a given change in temperature.
- violet: The temperature of the metal lid rises faster and the metal expands more for a given change of temperature.
Find numbers for the pertinent material properties to agreee on your explanation.