p04 050

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50. We apply Eq. 4-33 to solve for speed v and Eq. 4-32 to find centripetal acceleration a.

(a) v = 2πr/T = 2π(20 km)/1.0 s = 1.3

× 10

5

km/s.

(b)

a =

v

2

r

=

(126 km/s)

2

20 km

= 7.9

× 10

5

m/s

2

.

(c) Clearly, both v and a will increase if T is reduced.


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