How does the moon's gravitational pull on earth compare with earth's gravitational pull on the moon?
a. the moon pulls with more gravitational force.
b. earth pulls with more gravitational force.
c. because both earth and the moon go around the sun, there is no gravitational force between earth and the moon.
d. the gravitational pull of earth on the moon is the same as the gravitational pull of the moon on earth.

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600