You have a fossil that is 100 grams and you use carbon-14 dating (carbon-14 has a half life of 5730 years). You find that 50% of the substance is still radioactive (has not decayed). How old is the fossil?

During the apollo moon missions, astronauts were concerned about the effects of newton's third law of motion when: o a. they ejected waste water, because they were concerned that it would push them off course. o b. they reentered earth's atmosphere, because they were carrying heavy moon rocks. o c. they took off from earth, because a large force was required to generate large acceleration. o d. they detected incoming space debris, because the inertia of the debris could damage their ship.