An archaeologist discovered some charcoal at an excavation site. he sent the samples to a lab for c-14 dating, knowing that the half-life of c-14 is approximately 5,600 years. the lab reported that the charcoal had 1/8 the amount of c-14 in it that a living sample would have. how many years old
was the charcoal?
a. 700 years
b. 1,867 years
c. 8,400 years
d. 16,800 years
e. 44,800 years

Here we assume that disintegration has occur so the normal t½ formular will not be used
mathematically we..⅛×5600 =700
therefore it is about 700years option A

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.