Could someone please help me in solving the practice exam questions. I am taking

Question

Could someone please help me in solving the practice exam questions. I am taking it tommorow and I have no sense on these questions.

The space shuttle is in a circular orbit around the earth at an altitude of about 6000 m from the center of the earth.It makes one complete orbit in about 90 minutes.What is the acceleration of the shuttle towards the center of the earth?

Next which is related to the former question,  

The moon is also in a circular orbit around the earth at a much greater distance than the space shuttle.The acceleration of the moon towards the earth is

(a)   the same as that of the shuttle.
(b)   greater than that of the shuttle.
(c)   less than that of the shuttle.

Thank you

Explanation / Answer

(b) its acceleration is a = v2 / r but we first needthe speed in meters / second 28340 km/hr * 1000 m / 1km * 1 hr / 3600 s = = 7872 m/s So a = 78722 / 6540000 = 9.476m/s2 direction? TowardEarths center

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