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6. Which statement is true about the moon? a. It is kept in its orbit by the gravity of Earth. b. It has a velocity parallel to the radius vector. C. It has a velocity of 9.8 m/s. . It was not considered as a falling body by Sir Isaac Newton. 7. What is space junk? a. It is debris from artificial objects orbiting Earth. b. It refers specifically to discarded rocket boosters that did not return to Earth. c. It consists both of wanted objects such as GPS satellites and unwanted objects such as discarded rocket boosters. . It refers to satellites that will never return to Earth. 8. Which of the following statements is true about general relativity? a. It explains gravity in terms of forces. 6. It is a theory that was developed by Sir Isaac Newton. C. It was shown to be incorrect by Albert Einstein. d. It explains gravity in terms of the geometry of space and time. 9. Which statement is true? a . All protons carry the same amount of negative charge. b. Like charges repel and unlike charges attract. All electrons carry the same amount of positive charge. d. All of these. 10. What is true concerning the total charge of a closed system? a. remains constant b. always neutral C . always positive d. always negative 11. A charged balloon is held near a stream of water flowing from a faucet. It attracts the water. Why is the water attracted? a. The charge on the balloon transfers to the water molecules causing attraction. b. The water molecules are charged. The water molecules break into hydrogen and oxygen atoms when in the presence of a C. charged object. d. The object induces a charge separation in the water