Which statement about protons is true? a. they have a charge that is always a whole number. b. they are smaller than neutrons and electrons. c. they weigh much less than electrons. d. they are inherently unstable.

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.