What is the definition of period? what is the symbol for period, and what are its units? b. what is the definition of frequency? what is the symbol for frequency, and what are its units?
c. what is the relationship between period and frequency?​

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.