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Group A—Continued Group B—Continued
11. How many kilometers distance on Earth’s surface is 1° of 11. How many kilometers distance on Earth’s surface is 1° of
longitude along the 10° latitude parallel? 1° of longitude along longitude along the 15° latitude parallel? 1° of longitude along
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the 80° parallel? (Assume Earth’s radius is 6.281 × 10 km at the the 45° parallel? (Assume Earth’s radius is 6.161 × 10 km at the
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10° parallel and 1.108 × 10 km at the 80° parallel.) 15° parallel and 4.510 × 10 km at the 45° parallel.)
12. What is the age of a 25-year-old person in mean solar days and 12. What is the age of a 75-year-old person in mean solar days and
sidereal days? sidereal days?
13. In mid-May, a gardener saw a time of 2 p.m. on a sundial. What is 13. In mid-October, a gardener’s wristwatch reads 11:30 a.m. What
the time on the gardener’s wristwatch? is the time indicated on the sundial in the garden?
14. An airline passenger departs New York at 11:45 a.m. and lands in 14. An airline passenger departs Seattle, Washington, at 6:45 a.m.
Los Angeles, California, after a 5.5 hour direct flight. What is the and lands in Portland, Maine, after a 6.25 hour direct flight.
local time upon arrival? What is the local time upon arrival?
15. What is the force of the Moon’s gravitational attraction on Earth 15. What is the force of the Moon’s gravitational attraction on Earth
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at perigee? (Assume the Earth-Moon distance is 4.064 × 10 m.) at apogee? (Assume the Earth-Moon distance is 3.616 × 10 m.)

432 CHAPTER 16 Earth in Space 16-28