1.33 use the relationship between orbital speed, orbital radius and time period

orbital speed = 2x (pi) x orbital radius                                  
                          time period
   y = 2x (pi) x r          

            T

  

calculate the speed of a stellite that is orbiting 200km above the earth's surface and completes one orbit in 1h 24 min. The radius of the earth is 6400 km

EQN    V = 2(pi)r      
                       T
SUB   V = 2x(pi)x(200+6400)      
                     (60+24)x60

= 8.22 km/s

Planet	Distance from Sun (astronomical units (AU)	Time for orbit (years)	Speed (AU per year)
Mercury	0.4	0.2	12.57
Venus	0.7	0.6	7.33
Earth	1.0	1.0	6.28
Mars	1.5	1.9	4.96
Jupiter	5.0	12.0	2.62
Saturn	9.5	30.0	1.99
Uranus	19.0	84.0	1.42
Neptune	30.0	165.0	1.14