If all friction could be removed from a
Efficiency of heat engine after removing all frictions.
Explanation of Solution
Introduction:
As per the second law of thermodynamics, the heat transfers from a body at high temperature spontaneously to a body at lower temperature. Any device that transforms internal energy to mechanical work is called a heat engine.
Three processes that occur in every heat engine are:
- The internal energy increases by absorbing energy from hot reservoir.
- Some of the energy is converted into work.
- The remaining energy is expelled as heat to cold reservoir.
The thermal efficiency can be expressed as follows:
Where,
W is the useful work,
QH is the net heat input from the hot source.
As per second law of thermodynamics, it is not possible for heat engines to have
The ideal efficiency
Even if all friction is removed,
Chapter 24 Solutions
Conceptual Physics: The High School Physics Program
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