3. An apple hangs on a tree on the Earth. Which of the following statements is correct? a. The force on the apple is greater than the force on the Earth because the Earth is more massive. b. The force on the Earth is greater than the force on the apple because the Earth is more massive. c. The force on the apple is less than the force on the Earth because the tree is supporting the apple. d. The forces on the apple and Earth are equal. 4. Planet Alpha has the same radius and 4 times the mass of the Earth. What is the best estimate for the magnitude of the gravitational field at the surface of planet Alpha? a. 10 m/s? b. 2.5 m/s? c. 20 m/s? d. 40 m/s?

3. An apple hangs on a tree on the Earth. Which of the following statements is correct? a. The force on the apple is greater than the force on the Earth because the Earth is more massive. b. The force on the Earth is greater than the force on the apple because the Earth is more massive. c. The force on the apple is less than the force on the Earth because the tree is supporting the apple. d. The forces on the apple and Earth are equal. 4. Planet Alpha has the same radius and 4 times the mass of the Earth. What is the best estimate for the magnitude of the gravitational field at the surface of planet Alpha? a. 10 m/s? b. 2.5 m/s? c. 20 m/s? d. 40 m/s?