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1. Which of these can be considered inertial reference frames?    A: a car traveling on...

1. Which of these can be considered inertial reference frames?

  

A: a car traveling on a straight road at a steady speed

   

B: a car traveling on a straight road at increasing speed

   

C: a car traveling around a curve at a steady speed

   

both A and B

   

both A and C

   

both B and C

   

A, B and C

2.A beam of light traveling to the right passes by an observer on the ground, who measures its speed as c. At the same time, Maria flies past in her rocket, traveling to the right at a speed of 0.5c, as measured by the observer on the ground. From Maria's perspective, the speed of the light beam is

  

0.5c

   

–0.5c

   

c

   

1.5c

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