"Annual motion" refers to changes in the positions of stars in the sky as the result of ________.
A. the Sun's orbit around the center of the galaxy
B. the motion of the Sun around Earth
C. Earth's rotation on its axis
D. Earth's motion as it orbits the Sun
E. the rotation of the celestial sphere around Earth
Answer: D
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A laser beam is emitted on earth (event A), bounces off a mirror placed on the moon by Apollo astronauts (event B), and then returns to a detector on earth (event C). The detector is 12 ns of distance from the laser.
(a) The space time interval between events A and B is: A. Time like B. Light like C. Space like
Suppose you are inside a smooth-flying [no bumps] jet plane moving at constant speed in a straight line across the Atlantic Ocean. Can you detect this motion [i.e
, can you tell that you are moving] without directly or indirectly making use of anything outside of your own reference frame? If so, how could you detect this; and if not, why not? A) Yes. For example, if you dropped a coin you would find that it lands to the rear of the drop point. B) Yes. For example, if you dropped a coin you would find that it lands to the front of the drop point. C) No, because of the principle of relativity. D) No, because of the principle of the constancy of lightspeed. E) No, because jet planes move far too slowly for such an effect to actually be observed.
Why can't Thomasin find any constellations she recognizes?
A: Dusty regions like those in the Whirlpool Galaxy are preventing the starlight escaping the Milky Way. B: Black holes in the spaces between galaxies trap enough light to render most stars invisible from long distances. C: Warping of space-time by galaxy masses bends the starlights' paths and distorts the constellations' shapes. D: From any position far outside the Solar System, the stars are seen at different angles and fall out of the constellations' traditional shapes. E: Not enough time has passed for the Milky Way stars' light to reach the Kiranye's galaxy.
Two uniform rods, each of length 2.0 m, are bent to form semicircles. One rod has a charger per unit lent of 1.5 nC/m, and the other has a charge per unit length of –1.5 nC/m. The semicircles are joined to make a circle. What is the magnitude of the electric field at the center of the circle?
a. 42 N/C b. 84 N/C c. 34 N/C d. 68 N/C e. 0