Very early in his thinking about relativity, Einstein asked himself what a person would observe if he or she kept up with a lightbeam. In answer to this question, the theory of relativity states that
A) this is not a valid question because a person cannot move as fast as a lightbeam.
B) the light beam would stand still and so time would stand still.
C) the observer would suddenly undergo a sex change.
D) the observer own would continue to observe the same laws of physics.
E) time would speed up without limit, and would pass at an infinite rate.
Question 2
A spinning ice skater on extremely smooth ice is able to control the rate at which she rotates by pulling in her arms. Which of the following statements are true about the skater during this process? (There could be more than one correct choice.)
A) She is subject to a constant non-zero torque. B) Her kinetic energy remains constant.
C) Her moment of inertia remains constant. D) Her angular momentum remains constant.
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