A250-g sample of copper is heated to 100∘∘c and placed into a cup containing 370 g of water initially at 30.0∘∘c. ignore the container holding the water, assume no heat is lost or gained to the environment. 1) find the final equilibrium temperature of the copper and water. (express your answer to two significant figures.)

Explanation:

The solution involves the law of conservation of energy and the equation for heat, Q:

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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.