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  1. Problems
  2. /Heat & Thermodynamics
  3. /Heat Transfer

Heat Transfer

Physics
+ Upload a Problem
More in Heat & ThermodynamicsTemperature and Thermal ExpansionCalorimetry and Change of StateHeat TransferKinetic Theory of GasesLaws of ThermodynamicsThermodynamic Processes and Specific Heats of GasesHeat Engines, the Second Law and Entropy
12 problems
Type:
1.
Answer, and give a reason. Why does milk added to tea right away keep the tea warmer than milk…
High School (11–12) · Heat TransferStemPy LabStemPy Lab
Easy
2.
A body is 20 K warmer than the room. It cools by Newton's law, and its excess falls to 10 K in 6.0…
High School (11–12) · Heat TransferStemPy LabStemPy Lab
Medium
3.
A body cools from 75 °C to 65 °C in 5.0 minutes in a room at 25 °C.
High School (11–12) · Heat TransferStemPy LabStemPy Lab
Easy
4.
A cup of coffee cools from 88 °C to 78 °C in 3.5 minutes in a room at 22 °C.
High School (11–12) · Heat TransferStemPy LabStemPy Lab
Medium
5.
A red giant star radiates a power of 2.0 × 10²⁹ W from a surface at 3500 K.
High School (11–12) · Heat TransferStemPy LabStemPy Lab
Hard
6.
The light of a star is strongest at a wavelength of 410 nm.
High School (11–12) · Heat TransferStemPy LabStemPy Lab
Easy
7.
A person has 1.6 m² of skin at 33 °C and sits in a room whose walls are at 18 °C.
High School (11–12) · Heat TransferStemPy LabStemPy Lab
Medium
8.
A 40 W lamp gives out all its power as radiation from a tungsten filament at 2500 K, whose…
High School (11–12) · Heat TransferStemPy LabStemPy Lab
Medium
9.
Answer, and give a reason. Why are the handles of pans made of wood or plastic?
High School (11–12) · Heat TransferStemPy LabStemPy Lab
Easy
10.
A copper rod and an aluminium rod, each 0.80 m long with a cross-section of 1.5 cm², lie side by…
High School (11–12) · Heat TransferStemPy LabStemPy Lab
Medium
11.
A copper rod 0.60 m long and a steel rod 0.30 m long, each with a cross-section of 3.0 cm², are…
High School (11–12) · Heat TransferStemPy LabStemPy Lab
Medium
12.
A pane of glass has an area of 1.2 m² and a thickness of 3.0 mm.
High School (11–12) · Heat TransferStemPy LabStemPy Lab
Easy