Question

For Q18 to 220. A certain spacecraft's period in a circular orbit around an imaginary planet is 100 min. The mass of the spacecraft is m, - 1.5x10*kg and the radius of its orbit is r - 2x10m. Assume that the planet is a 100 uniform sphere of radius R, - 1.5x100m. Take G x 10-'N. m/kg? Q18. Find the mass m, of the planet. A) 0.8x10kg B) 1.0x109kg C) 1.2 x 10% kg D) 1.4x10” kg E) 1.6x10”kg 15 Q19. Find the work required to put the spacecraft into orbit from a launch station on the planet. A) 3x10") B) 5x10") ()6x10") D) 7x10") E) 8x10") Q20. Find the minimum energy required for the spacecraft to leave the orbit and escape from the planet's gravitational field A) 1x10") B) 1.5x10") () 2x10") D) 3x10") E) 4x100

g=10 pi=3

Answer 1

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