Homework solutions
• Question 8   (1 point) What is the circular velocity of
Mercury? You will need values from Appendix A of the
textbook. You might also find the example in By the
Numbers 4-1.
a. About 5 km/s.
• b. About 25 km/s.
• c. About 50 km/s.
• d. About 75 km/s.
• e.About 100 km/s.
• Start From Vc = (GM/R)0.5
• G = 6.67x10-11 m3/kg s2, M=2x1030 kg, R=5.8x107 km