Answer:
The efficiency of a Stirling engine is 74%
Explanation:
Given:
Temperature of gas when it is cold K
Temperature of gas when it is hot K
The efficiency of a stirling engine,
∴
Therefore, the efficiency of a Stirling engine is 74%
Answer:
Is a version of the law of conservation of energy
100 Joules have been used to roll the object up the ramp, but only 90 Joules were actually needed to lift the object, this means that 10 Joules have been wasted in the form of heat due to the friction between the object and the ramp, and this corresponds to
so, 10 % of the energy.
a temperature difference and the presence of electromagnetic waves
Explanation:
For radiations to occur, there must be presence of temperature difference and electromagnetic waves.
Radiation is a form of heat transfer that does not require a medium. Any hot body emits radiation from its surface.
A hot body is not at thermal equilibrium with its environment.
It has some of its electrons in excited state and by so they emit radiations.
Electromagnetic waves that vibrates transversely emits radiations. This is the mode of heat transfer in place for most electromagnetic waves
learn more:
Electromagnetic radiation brainly.com/question/6818046
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Answer:
Hey there!
The correct answer would be option A. If one body is positively charged and another body is negatively charged, free electrons tend to move from the negatively charged body to the positively charged body
Let me know if this helps :)