A5.74 g charcoal sample from an ancient fire pit has a 14c activity of 60.4 disintegrations/min. a living tree has a 14c activity of 15.3 disintegrations/min per 1.00 g. the half-life of 14c is 5730 y. how old is the charcoal sample?

Suppose that three astronomical objects, 1, 2, and 3 are observed to lie on a line, and the distance from object 1 to object 3 is d. object 1 has four times the mass of object 3, and seven times the mass of object 2. find the distance between objects 1 and 2 for which the net force on object 2 is zero.