Special relativity predicts that the observed mass of a moving particle depends on its ____.
a. inertia
b. curvature
c. velocity
d. force
e. true position
Question 2Spiral arms are obviouseasily-seen featuresbecause they contain ____.
a. dense molecular clouds
b. atomic hydrogen clouds
c. sun-like stars
d. OB associations
e. supernovae
Question 3The second postulate of special relativity states that ____.
a. observers cannot detect their uniform motion except relative to other objects
b. observers cannot distinguish locally between inertial forces and uniform gravitational forces due to acceleration and the presence of a massive body
c. the laws of physics are the same for all observers regardless of their motion as long as their speed is constant
d. the speed of light is constant and will be the same for all observers independent of their motion relative to the light source
e. the acceleration of an object is proportional to the applied force and inversely proportional to its mass
Question 4Spiral density wave theory and self-sustaining star formation are ways to explain why ____.
a. stars orbit the galaxy with different periods at different distances from the center
b. sun-like stars are evenly distributed through the disk of the galaxy
c. dark matter affects the orbit of stars outside the visible disk of the galaxy
d. molecular clouds are compressed forming young stars along spiral arms
e. the central bulge of the galaxy has a bar shape
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