Heat Transfer Methods
Physics ⇒ Heat and Thermodynamics
Heat Transfer Methods starts at 7 and continues till grade 12.
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A hot air balloon rises because of which method of heat transfer?
A metal plate is exposed to sunlight and becomes hot. Which method(s) of heat transfer are involved in this process?
A metal rod is heated at one end. After some time, the other end also becomes hot. Which method of heat transfer is responsible for this?
A room is heated by a radiator. The air near the radiator becomes warm and rises, while cooler air moves in to take its place. What is this process called?
A window pane has an area of 2 m², thickness 0.01 m, and thermal conductivity 0.8 W/m·K. If the temperature difference across the pane is 20 K, calculate the rate of heat transfer through the pane.
Calculate the heat transferred in 10 minutes through a wall of area 5 m², thickness 0.2 m, thermal conductivity 0.5 W/m·K, and temperature difference 30 K.
Define thermal conductivity.
Describe the process of heat transfer in a refrigerator.
Explain why convection does not occur in solids.
Explain why double-glazed windows are used in cold climates.
Explain why metals feel colder than wood at the same temperature.
State Stefan-Boltzmann Law.
The rate of heat transfer by conduction through a slab is given by the formula Q = kA(ΔT/d). What does 'd' represent in this formula?
What is the main reason for using silvered surfaces in thermos flasks?
Which method of heat transfer is most effective in metals?
Which method of heat transfer is responsible for the warming of the Earth by the Sun?
A black metal plate and a shiny metal plate are placed side by side in sunlight. After 10 minutes, which plate will be hotter and why?
A copper rod of length 1.5 m and cross-sectional area 2 × 10-4 m2 has its ends maintained at 100°C and 0°C. If the thermal conductivity of copper is 400 W/m·K, calculate the rate of heat transfer through the rod.
A house has walls made of two layers: brick (thickness 0.2 m, k = 0.7 W/m·K) and insulation (thickness 0.1 m, k = 0.04 W/m·K). If the temperature difference across the wall is 25 K and the area is 10 m2, calculate the total rate of heat transfer through the wall.
A metal spoon is placed in a cup of hot tea. After a few minutes, the handle of the spoon becomes warm. Which process is primarily responsible for this heat transfer?
