1) An observer watching a sailing ship at sea notes that the ship appears to be "sinking" as it moves away. Which statement best explains this observation?
The surface of the ocean has depressions
The earth has a curved surface
The earth is rotating
The earth is revolving
Correct Answer Number: 2
2) At which location would an observer find the greatest force due to the Earth's gravity?
New York State
Tropic of Cancer (23.5N)
Correct Answer Number: 1
REMEMBER: The earth is an oblate spheroid which bulges at the euqator. The North Pole is closest to the center of the earth where gravity is the strongest.