QUES: Q: What is the principle that is vitally important to understanding the behaviour of a quantity closely related to energy?
A: This principle is vitally important to understanding the behaviour of a quantity closely related to energy, called entropy.
Does the answer answer the question?

ANS: yes

QUES: Q: In all reference frames, how is the the speed of light?
A: In contrast, the theory of special relativity postulates that light propagates at the speed of light in all inertial frames, and examines the implications of this postulate.
Does the answer answer the question?

ANS: no

QUES: Q: How often did the General People's Congress occur?
A: These then sent members to the annual General People's Congress, which was broadcast live on television.
Does the answer answer the question?

ANS: yes

QUES: Q: Where was Moura Photovoltaic Power Station located?
A: Portugal has considerable resources of wind and river power, the two most cost-effective renewable sources.
Does the answer answer the question?

ANS:
no