Captain Ray, on the Galactic Explorer, sets off bright signal lights at the two ends of his spaceship so that they are seen as flashing simultaneously by General Kay, who is watch the ship go by. General Kay concludes that she was next to the midpoint of the ship at the instant when the lights flashed in her reference frame. This can only happen if Captain Ray, at the center of the Galactic
Explorer,
a. sees the lights flash simultaneously in his coordinate system.
b. sees the bow (front) light flash before the aft (rear) light.
c. sees the aft (rear) light flash before the bow(front light.
d. can calculate that the light flashes reach General Kay so that the flash from the bow light reaches her before the flash from the aft light.
e. can calculate that the light flashes reach General Kay so that the flash from the aft light reaches her before the flash from the bow light.
b
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The constellations in which the Sun appears over the course of each year are called
a. circumpolar stars b. circumsolar stars c. the constellations of the zodiac d. the tropical constellations e. solstice stars
Suppose a solid uniform sphere of mass M and radius R rolls without slipping down an inclined plane starting from rest. The angular velocity of the sphere at the bottom of the incline depends on
A) the mass of the sphere.
B) the radius of the sphere.
C) both the mass and the radius of the sphere.
D) neither the mass nor the radius of the sphere.
NH3 is an example of
A) a molecule only B) a compound only C) both a molecule and a compound D) a collection of isolated atoms
How do scientists determine the age of fossils?
A) They only determine relative ages by assuming that deeper layers of sedimentary rock are older. B) They use radiometric dating to measure the age of the surrounding rocks. C) They cannot.