When no forces act on moving objects their paths are normally
A) straight lines.
B) circles.
C) ellipses.
D) all of the above
Answer: A
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Which of the following statements about the strong nuclear force are correct? (There may be more than one correct choice.)
A) It acts equally on protons and neutrons but not on electrons. B) It acts equally on protons, neutrons, and electrons. C) It has a much longer range than the electric force. D) It keeps electrons in their orbits around the nucleus. E) Because of its very short range, there is a limit to how large the nucleus can be.
The Hubble Space Telescope
a. has a flawed primary mirror b. has been repaired c. has failed d. none of the above
The crust of the Earth is covered by about ________ water in the hydrosphere
A) 50% B) 60% C) 70% D) 80% E) 90%