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F) 1.17 kg
(1.71 N)(1.70 × 106 m)2
m = W g moon =
= 1.00 kg
C) 8.81 kg
G) 2.97 kg
(6.67 × 10−11 Nm 2 /kg 2 )(7.40 × 1022 kg)
D) 4.35 kg
H) 5.82 kg
3. A spaceship is in orbit around the earth at an altitude of 19,290 km. Which one of the
following statements best explains why an astronaut experiences "weightlessness"?
A) The spaceship is in free fall so its floor cannot press upward on the astronaut.
B) The pull of the earth on the spaceship is canceled by the pull of the other planets.
C) The location of the spaceship is equidistant between the earth and the moon.
D) The force decreases as the inverse square of the distance from the earth's center.
E) The force of the earth on the spaceship and the force of the spaceship on the earth
cancel because they are equal in...
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