Cork has a density of about 0.60 g/cm3. Cork will partially float in water which has a density of 1.0 g/cm3. If the piece of cork has a total volume of 4.0 cm3 what volume of cork is ABOVE the water?

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

b) nuclear ive learned that in a pedtrodic table

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.