To find: The efficiencies of the parts of the power train (engine, transmission, wheels, and tires).
To explore:The possible improvements in each of these efficiencies.
Explanation of Solution
Formula used:
The equation for the power needed to do work on the system is
Here,
The work done on the system through a distance is given by the equation,
Here,
Calculation:
If the displacement vector and the force are in the same direction, that is,
The equation for the power would change to
The efficiency of the engine depends upon the work output over the work generated by the engine.
The transmission efficiency of fuel to the engine is close to 90 % or above. The friction force that opposes the motion of the engine is reduced by the rolling so, the efficiency loss would be like 1 % due to the wheels and tires. The efficiency of the engine is significant than the changes in the efficiency of transmission, wheel, and tiers in an automobile.
Conclusion:
Hence, the efficiency of the engine is significant than the changes in the efficiency of transmission, wheel, and tiers in an automobile.
Chapter 10 Solutions
Glencoe Physics: Principles and Problems, Student Edition
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