Figure 18.17 shows the variation of the Earth's gravitational field strength with distance from its centre. g/N kg-¹ 10.0- 8.0- 6.0- 4.0- 2.0- 5.0 R 10.0 15.0 20.0 25.0 r/106 m Figure 18.17 For End-of-chapter Question 11. a Determine the gravitational field strength at a height equal to 2R above the Earth's surface, where R is the radius of the Earth. b A satellite is put into an orbit at this height. State the centripetal acceleration of the satellite. c Calculate the speed at which the satellite must travel to remain in this orbit.

Figure 18.17 shows the variation of the Earth's gravitational field strength with distance from its centre. g/N kg-¹ 10.0- 8.0- 6.0- 4.0- 2.0- 5.0 R 10.0 15.0 20.0 25.0 r/106 m Figure 18.17 For End-of-chapter Question 11. a Determine the gravitational field strength at a height equal to 2R above the Earth's surface, where R is the radius of the Earth. b A satellite is put into an orbit at this height. State the centripetal acceleration of the satellite. c Calculate the speed at which the satellite must travel to remain in this orbit.