Item 7 An engineer is designing a shape memory alloy. Which of the following is a limitation of these types of materials? Choose the correct answer.

They are composed of rare metals.

They can wear out after repeated use.

They are difficult to manufacture on a large scale.

They are hazardous when placed in the human body.

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answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.  

answerambulatory;