8. A sample of cobalt (specific heat of Co=0..418 J/gºC) at 200.0°C is dropped into a calorimeter containing 50.0 mL of water at 21.1°C. The final temperature of the water/cobalt mixture was 67.1°C. What was the mass
of the sample of cobalt?
(Hint: 1 mL of water has a mass of 1 gram)

the answer is d.) potassium

the answer is yes

it has kinetic energy

reason

an object has kinetic energy when you stop the force carrying it, the object will stay in motion.

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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.