In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
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Question: Question: When a device become less efficient, its production of usable energy will go 
 Answer: down

Answer: The more efficient a device is, the greater the percentage of usable energy it produces.


Question: Question: Dan needs to stay warm in the woods, and can bring one animal for body heat to sleep next to him. Given the choice between a horse and cat, Dan will choose the 
 Answer: horse

Answer: Therefore, an object with more mass has greater thermal energy than an object with less mass, even if their individual atoms are moving at the same speed.


Question: Question: If a system gives off a lot of heat then it is 
 Answer: wasteful

Answer:
The greater the wasted output energy, the less efficient the system.