According to what we now know from Newton's laws, which of the following best explains why Kepler's second law is true?
A) A planet's angular momentum must be conserved as it moves around its orbit.
B) Orbits must be elliptical in shape.
C) Gravity is an inverse cube law.
D) This effect happens because of the influence of other planets on a particular planet's orbit.
Question 2
Which of the following statements best describes what is relative in the theory of relativity?
A) The theory says that everything is relative.
B) The theory says that truth can never be established in any absolute sense.
C) The theory says that measurements of motion make sense only when we state what they are measured relative to.
D) The theory says that the speed of light is relative and depends on who is measuring it.
E) The theory says that all scientific results must be considered within the context of the scientists' individual viewpoints.
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