25) The engine that powers a crane burns fuel at a temperature of 2000 °C. It is cooled by air at a temperature of 20 °C. The crane is used to lift a 2000 kg steel girder 30 m into the air. a.) Draw and label the energy flow diagram for the crane b.) How much work is done by the crane in lifting the girder? c.) If the engine is 40 % as efficient as a Carnot engine, what is its thermal efficiency in %?
25) The engine that powers a crane burns fuel at a temperature of 2000 °C. It is cooled by air at a temperature of 20 °C. The crane is used to lift a 2000 kg steel girder 30 m into the air. a.) Draw and label the energy flow diagram for the crane b.) How much work is done by the crane in lifting the girder? c.) If the engine is 40 % as efficient as a Carnot engine, what is its thermal efficiency in %?
Related questions
Question
Please show all details
Transcribed Image Text:25) The engine that powers a crane burns fuel at a temperature of 2000 °C. It is
cooled by air at a temperature of 20 °C. The crane is used to lift a 2000 kg steel
girder 30 m into the air.
a.) Draw and label the energy flow diagram for the crane
b.) How much work is done by the crane in lifting the girder?
c.) If the engine is 40 % as efficient as a Carnot engine, what is its thermal
efficiency in %?
d.) How much energy is transferred to the engine by the burning fuel?
e.) How much energy is expelled into the air as exhaust?
f.) Why is it not possible to build a Carnot heat engine?
g.) If the engine burnt the fuel at 1500 °C instead of 2000 °C, would the amount
of energy needed be larger or smaller? Explain your answer.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 2 images
