Multiple Choice
Which type of heat transfer is primarily responsible for enabling hot air balloons to fly?
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20. Heat and Temperature
Heat Transfer
Multiple Choice
In the context of heat transfer, how does heat flow between two objects?
A
Heat flows spontaneously from an object at higher temperature to an object at lower temperature .
B
Heat flows spontaneously from an object at lower temperature to an object at higher temperature .
C
Heat flows equally in both directions regardless of temperature difference .
D
Heat does not flow between objects of different temperatures .
Verified step by step guidance1
Understand the concept of heat transfer: Heat is energy that flows due to a temperature difference between two objects or systems.
Identify the temperatures of the two objects, denoted as \(T_1\) and \(T_2\), where \(T_1\) and \(T_2\) represent the temperatures of object 1 and object 2 respectively.
Recognize that heat flows spontaneously from the object at the higher temperature to the object at the lower temperature. This means if \(T_1 > T_2\), heat will flow from object 1 to object 2.
Note that the direction of heat flow is driven by the temperature difference \(\Delta T = T_1 - T_2\), and heat will not flow from a colder object to a hotter object without external work.
Conclude that heat does not flow equally in both directions and it always moves to reduce the temperature difference, moving from higher to lower temperature until thermal equilibrium is reached.
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