An electrician cuts a 10-meter-long copper wire having a density of 8.9 g/cm3 into 10 equal parts. what is the density of each small part? one-tenth of 8.9 g/cm3 since density is an intensive property one-tenth of 8.9 g/cm3 since density is an extensive property 8.9 g/cm3 since density is an intensive property 8.9 g/cm3 since density is an extensive property

8.9 g/cm3 since density is an intensive property

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.